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document # micro-10 rev b revised august 2005 pace1757m/me complete embedded cpu subsystem features implements complete mil-std-1750a isa including optional mmu, mfsr, and bpu functions. two throughput options: p1757m 2.5mips usaf dais mix (inc.flt.pt.)@40 mhz p1757me 3.6mips usaf dais mix (inc.flt.pt.)@40 mhz all mil-std-1750a data formats and address types implemented. p1757me includes additional matrix and vector instructions to enhance throughput in navigation, dsp transcendental and other complex alorithms. error detection and correction and parity bit provided. separate high drive external address & data busses. 10mhz data rate at 40mhz cpu clock system support functions included: arbitrator for use in tightly coupled multiprocessor design. bus control provided to aid in implementation of multi-processor systems. mil-std-1750a timers a & b, programmable watch dog timer and programmable bus time- out function. start up rom support per mil-std-1750a. dma support for logical and physical memory addresses. general description all functions required for a complete mil-std-1750a embedded cpu subsystem are in this single vlsi microcircuit occupying 1.5 square inches of board space with less than 1.9 watts of power dissipation at 40 mhz. pyramid's p1757m/me is a complete, single package, 3.6 mips subsystem solution to embedded processor requirements. the pace 1757m uses the application-proven pace 1750a microprocessor, the pace 1753, and the pace 1754. the pace1757me uses the enhanced pace 1750ae microprocessor, which has additional instructions that provide high throughput for transcendental functions, navigational algorithms, and dsp functions. the pace 1750ae is an architectural enhancement of the pace 1750a. programmable memory and i/o data wait state generation permits up to four different memory speeds in the same system. programmable address wait states. sixteen levels of interrupts are provided per mil-std-1750a. interrupts can be either edge- or level-sensitive. fault detection and handling programmable detection of unimplemented memory or illegal i/o addresses. full implementation of mil-std-1750a fault register. external address error detection. testability and diagnostics. first falling address and data registers. built in test - runs automatically at power on and after each reset. all hardware blocks and external busses examined. hardware pass/fail for catastrophic failures. status register indicates failed test. console operating mode which allows operator to examine and change contents of registers within the cpu, any system memory location, or the i/o subsystems. single 144-pin quad straight lead or gullwing 1.5 square inches of board surface. operating temperature range -55 to +125c; single 5v 10% v cc power supply; power dissipation < 1.9w (worst case at 40 mhz).
pace 1757 m/me page 2 of 34 document # micro-10 rev b
pace 1757 m/me page 3 of 34 document # micro-10 rev b ac/dc electrical specifications storage temperature ambient temperature with power vcc pin potential to ground pin input voltage input current voltage applied to inputs current applied to any output -65c to +150c -55c to +125c -0.5v to 7.0v -0.5v to v cc + 0.5v -30 ma to 5 ma -0.5v to v cc + 0.5v 100 ma maximum ratings (above which the useful life may be impaired) case temperature gnd v cc -55c to +125c 0v 5.0v 10% power dissipation ja 2.5 watts 35c/w grade military recommended operating conditions dc electrical specifications (over recommended operating conditions) symbol parameter min typ. max unit conditions v ih input high level 2.0 v cc +0.5 v v il input low level 2 -0.5 0.8 v v cd input clamp diode voltage -1.2 v i in =-18ma v cc =min 2.4 v i oh =-8ma v cc -0.2 v i oh =-300a v cc =min 0.5 v i ol =8ma 0.2 v i ol =300a v cc =min 0.5 v i ol =20ma 0.2 v i ol =300a v cc =min input high current except ib 0 -ib 15 , edc 0 -edc 5 , bus busy , bus lock , ext adr 0 -ext adr 7 10 a v in =v cc v cc =max input high current ib 0 -ib 15 , edc 0 -edc 5 , bus busy , bus lock , ext adr 0 -ext adr 7 50 a v in =v cc v cc =max i ih v oh output high voltage output low voltage except a 0 -a 15 , ext adr 0 -ext adr 7 output low voltage a 0 -a 15 , ext adr 0 -ext adr 7 v ol
pace 1757 m/me page 4 of 34 document # micro-10 rev b symbol parameter min typ. max unit conditions input low current except ib 0 -ib 15 , edc 0 - edc 5 , bus busy , bus lock , ext adr 0 -ext adr 7 , test on -10 a v in =gnd v cc =max input low current test on -500 input low current ib 0 -ib 15 , edc 0 -edc 5 , bus busy , bus lock , ext adr 0 -ext adr 7 -50 output 3-state current except singerr, strba 50 output 3-state current singerr, strba 500 output 3-state current except strbd -50 output 3-state current strbd -500 i ccqc quiescent power supply current (cmos input levels) 80 ma v in < 0.2v or > v cc -0.2v, f=0hz outputs open v cc =max i ccqt quiescent power supply current (ttl levels ) 210 ma v in =3.4v, all inputs, f=0hz outputs open v cc =max i ccd ttl dynamic power supply current f=20 mhz f=30 mhz f=35 mhz f=40 mhz 280 310 325 340 ma v in < 0.8v or > 3.4v, outputs open v cc =max i ccd dynamic power supply current f=20 mhz f=30 mhz f=35 mhz f=40 mhz 150 180 195 210 ma v in < 0.2v or > v cc -0.2v outputs open, v cc =max i os output short circuit current 1 (one output shorted at a time) -25 ma v out =gnd v cc =max c in input capacitance 3 5pf inputs only c out output capacitance 3 9pf outputs (includes i/o buffers) a i ozl v out =0.5v v cc =max i il a v in =v cc v cc =max a v out =2.4v v cc =max i ozh dc electrical specifications (continued) (over recommended operating conditions) note 1: duration of the short should not exceed one second. note 2: v il =-3.0v for pulse widths less than or equal to 20ns. note 3: this parameter is set by design and not tested.
pace 1757 m/me page 5 of 34 document # micro-10 rev b timing generator state diagrams two separate and almost independent state diagrams may be used to describe the pace1757m machine cycle. the execution unit performs according to a cycle of three state represented by diagram a (the a machine) and the external bus unit follows a minimum cycle of four states, indicated in diagram b (the b machine). referring to diagram a, the paths are defined as follows for the execution unit: (0) external reset true (1) external reset false (2) alu wait or bus wait. (3) alu branch false (4) alu branch true diagram a diagram b diagram b defines the paths for the external bus as follows: (0) external reset false (8) bus req. false (9) bus req. true and bus av. true (10) bus req. true and bus av. false (11) bus av. false (12) bus av. true (13) rdya false (14) rdya true (16) rdyd false (17) rdyd true and bus req. true and bus av. true (18) rdyd true and bus req. false (19) rdyd true and bus req. true and bus av. false (20) bus req. true and bus av. true note: bus a v = bus grant and bus not busy and bus not locked.
pace 1757 m/me page 6 of 34 document # micro-10 rev b differences between the pace1757m and pace1757me the pace1757me, which uses the p1750ae cpu, achieves a 41% boost in performance (in clock cycles) over the pace1757m, which uses the p1750a cpu. this reduction in clocks per instruction is because of three architectural enhancements: 1. the inclusion of a 24 x 24 multiply accumulate (mac) array. 2. a reduction in non-bus cycles to 2 clocks (bus cycles remain at 4 clocks to maintain full compatibility with cpu's peripher al chips). 3. branch calculation logic. the table below shows how the mac improves all multiply operations - both integer and floating point - by 477% to 760% clocks ex e cution time (40 mhz) clocks execution time (40 mhz) integer add/sub 4 100ns 4 100ns ? double precision integer add/sub 6 150ns 9 225ns 50 integer multiply 4 100ns 23 575ns 575 double precision integer add/sub 9 225ns 69 1725ns 760 floating add/sub 18 450ns 28 700ns 55 extended floating add/sub 34 850ns 51 1225ns 50 floating multiply 9 225ns 43 1075ns 477 extended floating point multiply 17 425ns 96 2400ns 564 branch (taken) 8 200ns 12 300ns 50 branch (not taken) 4 100ns 4 100ns ? flt'g' point polynomial step (mul+add/sub) 27 675ns 71 1775ns 263 ext flt'g' point polynomial step (mul/sub) 51 1275ns 147 3675ns 2400 dais mix (mips) ? 3.56 ? 2.52 41/59 pace1750ae pace1750a instruction gain # clocks (%) pace1757me built-in functions a core set of additional instructions have been included in the pace1757me. these instructions use the built-in function (bif) opcode space. the objective of these new opcodes is to enhance the performance of the pace in critical application areas such as navigation, dsp, transcendentals and other linpak and matrix type instructions. below is a list of the bifs and their execution times (n = the number of elements in the vector being processed). instruction mnemonic address mode number of clocks notes memory parametric dot product - single vdps 4f3(ra) 10 + 8 n interruptable memory parametric dot product - double vdpd 4f1(ra) 10 + 16 n interruptable 3 x 3 register dot product r3dp 4f03 6 double precision multiply accumulate macd 4f02 8 polynomial poly 4f06 7 n -2 clear accumulator clac 4f00 4 store accumulator (32-bit) sta 4f08 7 store accumulator (48-bit) stal 4f04 11 load accumulator (32-bit) lac 4f05 9 load accumulator long (48-bit) lacl 4f07 9 move mmu page block mmpg 4f0f 16 + 8 n priveleged load timer a reset register ltar 4f0d 4 load timer b reset register ltbr 4f0e 4
pace 1757 m/me page 7 of 34 document # micro-10 rev b timing generator state diagrams two separate and almost independent state diagrams may be used to describe the pace1757me machine cycle. the execution unit performs according to a cycle of three states represented by diagram a (the a machine) and the external bus unit follows a minimum cycle of four states, indicated in diagram b (the b machine). referring to diagram a, the paths are defined as follows for the execution unit: (0) external reset true (1) external reset false (2) alu wait or bus wait. (3) alu branch false (4) alu branch true diagram b defines the paths for the external bus as follows: (0) external rest false (1) no internal bus req. (2) internal bus req. (3) bus busy or no bus grant (4) bus grant and not busy or bus locked by cpu (5) rdya false (6) rdya true (7) rdyd false (8) rdyd true, and no internal bus request (9) rdyd true, internal bus request pending (10) bus locked by cpu and no internal request (11) bus locked by cpu internal req. note: bus a v = bus grant and bus not busy and bus not locked. diagram a diagram b
pace 1757 m/me page 8 of 34 document # micro-10 rev b signal propagation delays symbol description min max min max min max min max tc(br) l bus request 33 25 22 22 tc(br) h 33 25 22 22 tbg v (c) busgrant - setup 5 5 5 5 tc(bg) x busgrant - hold 5555 tc(bb) l bus busy 25 24 22 20 tc(bb) h 25 20 18 17 tbb v (c) bus busy - setup 5555 tc(bb) x bus busy - hold 5555 tc(bl) l bus lock 30 25 23 21 tc(bl) h 30 20 19 17 tbl v (c) bus lock - setup 5555 tc(bl) x (in) bus lock - hold 5555 tc(st) v m/ io 30 25 23 20 r/ w 30 25 23 20 as0:as3, ak0:ak3, d/ i 25 20 20 20 tc(st) x m/ io , r/ w , as0:as3, ak0:ak3, d/ i 0000 tc(sa ) h strba 22171616 tc(sa ) l 22 17 16 16 tsa l (iba) x address hold from strba(l) 5 5 5 5 tra v (c) rdya - setup 5 5 5 5 tc(ra ) x rdy a - hold 5 5 5 5 tc(sdw) l strbd 22 17 16 14 tc(sd) h 22 17 16 14 tfc(sdr) l 22 17 16 14 tibd x ( sdr) h 0000 tsdw h (ibd) x 30 25 21 17 tsd l (sd) h (write) 40262320 trd(rd) x rdyd - setup 5555 tc(rd) x rdy d - hold 5 5 5 5 tc(iba ) v ib0:ib15 30 25 23 20 tfc(iba ) x 0000 tibdr v (c)- setup 5555 tc(ibd) x (read) - hold 5 5 5 5 tc(ibd) x (write) datavalid (out) 0 0 0 0 tfc(ibd) v 30 25 23 20 tc(snw)snew 30262422 tfc(tgo) trigo rst 30 26 24 22 trst l (dma en) l dma enable 40 35 33 30 tc(dme) 40353330 tfc(npu) normal power-up 40 35 33 30 tc( er) clk to ma jer ( unrcv er) 60 50 47 45 trst l ( npu) reset 5 0 40 35 3 0 treq v (c) con req 0000 tc(req) x 10 10 10 10 tf v (bb) h level sensitive faults 5 5 5 5 tbb h (f) x 5555 tir v (c) iol 1/2 int. usr int (0:5) - setup 0 0 0 0 tc(ir) x pwrdn int, level sensitive - hold 10 10 10 10 trst l (trst h ) reset pul se width 25 2 0 1 8 1 5 tc(xx) z clk to tri- sta te 22 17 15 13 20 mhz 30 mhz 35 mhz 40 mhz note 1: units = ns
pace 1757 m/me page 9 of 34 document # micro-10 rev b signal propagation delays (cont'd) symbol description min max min max min max min max td/i(ext adr) v mmu cac he hit 25 23 23 23 tstrbd(ext adr er) external address error 25 20 18 16 tibd v ( edc gen) v error correction write cycle 30 25 24 23 tc(gnt) arbiter priority transition 35 25 22 18 tc(rdya) address ready 30 25 21 17 tibdin(mem par er) parity mode 34 30 28 25 tc(mem prt er) memory protect error 50 45 43 40 t strbd (wr prot) write protect cache hit 25 20 18 16 tc(wr prot)i write protect cache miss 25 22 20 18 td/i(prot flag) cache hit (bpu protection error) 40 45 42 40 td/i(prot flag) cache hit (mmu key-lock error) 40 35 33 30 tc(prot flag) cache hit (bpu protection error) 25 35 33 30 tc(prot flag) cache hit (mmu key-lock error) 25 20 20 20 tc( ext a dr) v clock to ext address valid (miss) 32 30 27 23 tfc(ib out) v clock to ext address valid (miss) 30 25 25 25 t ex rdy1 ( rdy d) ready data 28 24 23 21 t ex rdy (rdyd) ready data 16 13 12.5 11.5 tc ( rdy d) v ready data 28 22 19 16 tstrba h(a ) v address valid 29 21 20 19 tiba v (a) v address valid 31 22 21 20 tfc (r) l read strobes 24 18 15 12 tstrbd h (r) h read strobes 24 18 15 12 tstrbd h (w) l write strobes 26201815 tstrbd l (w) h write strobes 26201815 tstrbd( strtrom) star t- up rom 26 20 18 15 tc(tim clk) timer clock 30 25 23 20 text ad(fc b3) extended address set-up 10 10 10 10 tf(f), ti(i)edge sensitive pulse width5555 tr, tf clock rise and fall time 5 5 5 5 20 mhz 30 mhz 35 mhz 40 mhz note all timing parameters are composed of three elements. the first "t" stands for timing. the second represents the "from" signa l. the third in parentheses indicates "to" signal. when the cpu clock is one of the signal elements, either the rising edge "e" or the falling edge "fc" is referenced. when other elements are used, an additional suffix indicates the final logic level of the signal. "l" - low level, "h" - high level, "v" - valid, "z" - high impedance, "x" - don't care, "lh" - low to high, "zh" - high impedance to high, "r" - read cycle, and "w" - write cycle. units = ns
pace 1757 m/me page 10 of 34 document # micro-10 rev b minimum write bus cycle timing diagram
pace 1757 m/me page 11 of 34 document # micro-10 rev b minimum read bus cycle timing diagram
pace 1757 m/me page 12 of 34 document # micro-10 rev b minimum write bus cycle, followed by a non-bus cycle, timing diagram
pace 1757 m/me page 13 of 34 document # micro-10 rev b address bus and strobes note: all time measurements on active signals relative to 1.5v levels.
pace 1757 m/me page 14 of 34 document # micro-10 rev b rdyd timing test end timing 1 notes: 1. the last two instructions executed during system test are: xio ra, 1f44, 0 and jc 7, 0000 hex, 0. after execution of the iow bus cycle, the xio proceeds by filling the instruction pipe with two memory read bus cycles where the opcode 7070 hex and 0000 hex are entered to the processor. as from the end of strbd in the second cycle, test end is asserted. at this point, the execution of ic starts by first issuing two fetch cycles from the "old pc" (from addresses xxxx & xxxx +1). the data will be taken from system memory (because test end is asserted) but both the address and data are irrelevant. following that, ic will start filling the pipe from address 0000 hex a nd 0001 hex, now from the system memory to start user's program execution. 2. all time measurements on active signals relate to 1.5v levels.
pace 1757 m/me page 15 of 34 document # micro-10 rev b strt rom ib bus output (0:15) ex ad er extended addresses (0:1) note: all time measurements on active signals relative to 1.5v levels. error correction (write cycle) error correction (read cycle) memory protect error ready address
pace 1757 m/me page 16 of 34 document # micro-10 rev b mmu cache hit external address error note: all time measurements on active signals relative to 1.5v levels.
pace 1757 m/me page 17 of 34 document # micro-10 rev b mmu cache miss cycle (wa = 0) mmu cache miss cycle (wa > 0) * the wr prot/prot flag signal is programmed as wr prot or prot glag. (see bpu description). t = 1 clock period. note : all time measurements on active signals relate to 1.5v levels.
pace 1757 m/me page 18 of 34 document # micro-10 rev b trigo rst discrete timing dma en discrete timing normal power up discrete timing xio operations snew discrete timing
pace 1757 m/me page 19 of 34 document # micro-10 rev b external faults and interrupts timing edge-sensitive interrupts and faults (sysflt 0 , sysflt 1 ) min. pulse width level-sensitive interrupts level-sensitive faults con req note: tc(ir) x max = 35 clocks note: all time measurements on active signals relative to 1.5v levels.
pace 1757 m/me page 20 of 34 document # micro-10 rev b low priority to high priority transition bus arbitrator high priority to low priority transition note: all time measurements on active signals relative to 1.5v levels.
pace 1757 m/me page 21 of 34 document # micro-10 rev b bus acquisition note: a cpu contending for the bus will assert the bus req line, and will acquire it when bus gnt is asserted and the bus is not locked ( bus lock is high). switching time test circuits standard output (non-three-state) three-state parameter v o v mea t plz 3v 0.5v t phz 0v v cc ? 0.5v t pxl v cc /2 1.5v t pxh v cc /2 1.5v
pace 1757 m/me page 22 of 34 document # micro-10 rev b signal descriptions clocks and external requests mnemonic name description cpu clk cpu clock a single phase input clock signal (0-40 mhz, 40 percent to 60 percent duty cycle. this is a common input to all 3 devices. reset reset an active low input that initializes the device. input to the p1750a/ae, p1753 and p1754. con req console request an active low input that initiates console operations after completion of the current instruction. input to the cpu. interrupt inputs mnemonic name description pwrdn int power down interrupt an interrupt request input that cannot be masked or disabled. this signal is active on the positive going edge or the high level, according to the interrupt mode bit in the configuration register of the p1750a/ae. usr 0 int - user interrupt interrupt request input signals that are active on the positive going edge usr 5 int edge or the high level, according to the interrupt mode bit in the configuration register of the p1750a/ae. iol 1 int - i/o level interrupts active high interrupt requests that can be used to expand the number iol 2 int of user interrupts. inputs to the p1750a/ae interrupt register. error control mnemonic name description unrcv er unrecoverable error an active high output that indicates the occurrence of an error classified as unrecoverable. a signal from the cpu. maj er major error an active high output that indicates the occurrence of an error classified as major. a signal from the cpu. discrete control mnemonic name description nml pwrup normal power up an active high output that is set when the cpu has successfully completed the built-in self test in the initialization sequence. it can be reset by the i/o command rns. snew start new an active high output that indicates a new instruction is about to start executing in the next cycle. this signal is issued by the cpu. trigo rst trigger-go reset an active low discrete output. this signal can be pulsed low under program control i/o address 400b (hex) and is automatically pulsed during processor initialization. strt rom start up rom an output follow the execution of the esur and dsur, i/o commands as defined in mil-std-1750a. it will be at the logical level "1" after executing esur and at the logical "0" level after executing dsur. initially, it defaults to a "1" on the p1754. dma en direct memory an active high output that indicates the dma is enabled. it is access enable disabled when the cpu is initialized (reset) and can be enabled or disabled under program control (i/o commands dmae, dmad).
pace 1757 m/me page 23 of 34 document # micro-10 rev b signal descriptions (continued) bus control mnemonic name description test on system test enable an active-low input, used to enable the execution of the system test built into the p1754, immediately after completetion of the pace 1750 a/ ae initialization and before fetching any instructions from the user's program. test end system test end an active-high output indicating whether the pace 1754 system test has been completed. whenever the system test is disabled by the test on signal, the test end output will be at a logical "1" immediately after reset is removed. sc 0 -sc 4 system configuration inputs which are buffered onto ib0-ib4 when executing an i/o read inputs from i/o address 8410 (hex). d/ i data or instruction an output signal that indicates whether the current bus cycle access is for data (high) or instruction (low). it is three-state during bus cycles not assigned to the cpu. this line can be used as an additional memory address bit for systems that require separate data and program memory. r/ w read or write an output signal that indicates direction of data flow with respect to the current bus master. a high indicates a read or input operation and a low indicates a write or output operation. the signal is three-state during bus cycles not assigned to the cpu. m/ io memory or i/o an output signal that indicates whether the current bus cycle is memory (high) or i/o (low). this signal is three-state during bus cycles not assigned to the cpu. rdya_in address ready in an active high input to the cpu that can be used to extend the address phase of a bus cycle. when rdya_in is not active, wait states are inserted by the p1750a/ae to accomodate slower memory or i/o devices. this line is usually connected to rdya_out unless the memory interface logic requires the two rdya signals remain discrete as an input and output. rdya_out address ready out an active high output from the combo that indicates that there are no wait states requested when strba is active. wait states are inserted when this signal becomes inactive during strba. up to 3 wait states can be inserted by programming an internal register. three wait states are inserted after reset (default). rdyd data ready an active high signal to the cpu from the pic that extends the data phase of a bus cycle. when rdyd is not active, wait states are inserted by the p1750a/ae to accomodate slower memory or i/o devices.
pace 1757 m/me page 24 of 34 document # micro-10 rev b signal descriptions (continued) bus arbitration mnemonic name description bus req bus request an active low output that indicates the cpu requires the bus. it becomes inactive when the cpu has acquired the bus and started the bus cycle. bus gnt bus grant an active low input from an external arbiter that indicates the cpu currently has the highest priority bus request. if the bus is not used and not locked, the cpu may begin a bus cycle, commencing with the next cpu clock. a high level will hold the cpu in hi-z state (bz), three- stating the ib bus status lines (d/ i , r/ w , m/ io ), strobes (strba, strbd ), and all the other lines that go three-state when this cpu does not have the bus. bus busy bus busy an active low, bidirectional signal used to establish the beginning and end of a bus cycle. the trailing edge (low-to-high transition) is used for sampling bits into the fault register. it is three-state in bus cycles not assigned to this cpu. however, the cpu monitors the bus busy line for latching non-cpu bus cycle faults into the fault register. bus lock bus lock an active low, bi-directional signal used to lock the bus for successive bus cycles. during non-locked bus cycles, the bus lock signal mimics the bus busy signal. it is three-state during bus cycles not assigned to the cpu. the following instructions will lock the bus: incm, decm, sb, rb, tsb, srm, stub and stlb. bus gnt 0 - bus grant active-low outputs from the pic indicating which master was granted bus gnt 3 the bus. it remains active during bus lock unless a higher master request occurs, which resets it. however, the higher master will be granted the bus only after the current master's bus lock releases the bus. bus req 0 - bus request active-low inputs to the pic that indicate a requirement for the bus bus req 3 from the 4 masters on the bus. the master assigned to pin bus req 0 has the highest priority. the master assigned to pin bus req 3 has the lowest priority.
pace 1757 m/me page 25 of 34 document # micro-10 rev b signal descriptions (continued) faults and flags mnemonic name description mem prt er memory protect error an active-low input generated by the mmu or bpu, or both, during attempted writes to protected memory. it is sampled by the bus busy signal into the fault register (bit 0 cpu bus cycle, bit 1 if non-cpu bus cycle). the error is generated in one of the following conditions: a mismatch in the access keys in the mmu page, an access to an execution protected page during instruction cycles, an access to a write protected page during data cycles or an access to a page write protected by the bpu. mem par er memory parity error an active low signal which is sampled by the bus busy signal into bit 2 of the cpu's fault register. it signals an error on the data bus during a memory cycle. two detection modes can be selected by programming the control register of the mmu/combo: edac mode (6 hamming code parity bits) or single bit parity mode (even or odd parity). the signal is inactive when none of the above modes are selected (default after reset). ext adr er in external address an active-low input sampled by the bus busy signal into the cpu error in fault register (bit 5 or 8) depending on the cycle (memory or i/o). ext adr er out external address an active low output which signals to the cpu and memory interface error out logic that an unimplemented memory or illegal i/o access has taken place. sysflt 0 - system fault 0, asynchronous, positive edge sensitive inputs that set bit 7 (sysflt 0 ) sysflt 1 system fault 1 or bits 13 and 15 (sysflt 1 ) in the p1750a/ae fault register. ex ad er / illegal address error / an active low output from the pic indicating an illegal address error sing err single error when referencing memory or i/o. it becomes an active high input called single error for handshaking with the p1753 when the pic is programmed to support edac. default state after reset is high impedance. wr prot / write protected / either an active low output ( wr prot , following strbd timing) prot flag protection flag during legal memory write cycles when no protection occurs, or an active high (prot flag) signal indicating a protection error in a write cycle. either mode can be selected by programming the combo control register. default mode after reset is write protected. me pa er / memory parity error an active low output indicating a parity error when reading from ramdis memory. it becomes an active high output called ram disable for handshaking with the p1753 when the pic is programmed to support edac. tc terminal count an active high output from the pic indicating a bus time out or a watchdog trigger.
pace 1757 m/me page 26 of 34 document # micro-10 rev b signal descriptions (continued) status bus mnemonic name description ak 0 - ak 3 access key active high outputs corresponding to the ak field of the processor status word used to match the access lock in the mmu for memory accesses (a mismatch will cause the mmu to pull the mem prt er signal low), and also indicate the processor state (ps). priveledged instructions can be executed with ps=0 only. these signals are tri-state for bus cycles not assigned to this cpu as 0 - as 3 address state active high outputs corresponding to the as field of the processor status word that selects the page register group in the mmu. in the dma physical demultiplexed mode, as(0:1) will receive the 9th and 10th most significant bits of the physical address for use in the bpu function. these signals are tri-state in bus cycles not assigned to this cpu. information bus mnemonic name description ib 0 - ib 15 information bus a bi-directional time-multiplexed address/data bus. ib 0 is the most significant bit. edc 0 -edc 5 error detection / an active high output bus used for detection of errors on the data bus correction bus (ib 0 -ib 15 ) and correction of single errors. when working in parity mode edc 0 is the parity bit. edc 1 -edc 5 are undefined in this case. a(0:1) / address bus an active high output bus from the pic. contains the address of the ext adr(0:1) current bus cycle as latched by the end of strba. in system configurations a(2:15) including the mmu function, the only active lines during memory cycles are a(4:15). in this example, a(2:3) are high impedance (don't care) and a(0:1) turn into inputs called extended addresses, ext ad (0:1). in this situation, these two lines, supplied by the mmu, will be used to operate the programmable ready generation during bus cycles. ext adr 0 - extended address a bi-directionaly active high bus. in cpu cycles, it is an output bus ext adr 7 bus that is used to select one of 256 pages, 4k words each, expanding the direct addressing space to 1m word. in dma cycles, indicated by dma- ack being active, it is also an output bus except when programmed for the physical demultiplexed dma mode. in this example, it becomes an input to receive the eight most significant bits of the dma physical address for use in the bpu function.
pace 1757 m/me page 27 of 34 document # micro-10 rev b signal descriptions (continued) bus strobes and qualifiers mnemonic name description strba (note 1) address strobe an active high output that can be used to externally latch the contents of ib(0:15) into the address latches of the pic and mmu at the high to low transition of the strobe. the signal is tristate during bus cycles not assigned to this cpu. it is issued by the cpu and input to the mmu and pic. strbd (note 2) data strobe an active low output used to read or write data from the pic as well as to strobe data in memory and xio cycles. this signal is tri-state during bus cycles not assigned to this cpu. it is interconnected in the same manner as strba. memw memory write an active low output produced in memory write cycles by the pic. strobe memr memory read strobe an active low output produced by the p1754 in memory read cycles. iow i/o write strobe an active low output produced by the p1754 in output write cycles. ior i/o read strobe an active low output produced by the p1754 during input read cycles. strb en strobe enable an active low input, enabling the active state of the address outputs of the p1754 and the memr , memw , ior and iow outputs. when a logic "1" (if enabled by bits est and ead of the control register) it will correspondingly tri-state the above signals. inta interrupt acknowledge an active low output produced during any interrupt sequence strobe corresponding to an output write to address 1000 (hex). dma ack dma acknowledge an active high input from the dma controller to the p1753 which indicates a dma cycle. used to select the dma table in the bpu memory for protection. for example, this could allow the dma channel to update the program which could be write protected from the processor. in the physical dma mose, it will cause the extended address liones (ext adr 0-7 ) to become inputs providing bpu protection of the dma transfers. ex rdy external data ready an active high output from the mmu that indicates no wait states are requested. it becomes inactive for one clock (inserting one wait state) whenever a memory page different than the current one is accessed (e.g. a cache miss). ex rdy1 external data an active low input to the pic from the memory interface logic which at ready 1 a logical "1" overrides the internal rdyd generation and forces it to a logical "0". note 1: one internal pulldown resistor is provided at the strba input. the nominal value is 40k ohm and the maximum range is 2 0k ohm to 80k ohm. in designs with ttl devices loading strba, an additional external resistor may be required. note 2: one internal pullup is provided at the strbd input. the nominal value is 40k ohms and the maximum range is 20k-80k ohms.
pace 1757 m/me page 28 of 34 document # micro-10 rev b control register (1f50/9f50) 0123456789101112131415 qr1 qr2 qr3 qr4 odd eei eed epr spd wpt eb1 eb2 eio gpt dmx dlp control register 1 (1f51/9f51) 0123456789101112131415 wa0 wa1 spi res* peg idl unimplemented memory register 1 (1f55/9f55) 0123456789101112131415 unimplemented memory register 2 (1f56/9f56) 0123456789101112131415 first unimplemented output command (1f57/9f57) 0123456789101112131415 xxxxxx first unimplemented input command (1f58/9f58) 0123456789101112131415 xxxxxx first failing address register (9f59) 0123456789101112131415 first failing data register (9f5a) 0123456789101112131415 memory fault status register (a00d) 0123456789101112131415 id * reserved reserved bl2 lo bl2 hi bl1 lo bl1 hi lpa reserved as last sequential pio output command last sequential pio input command first failing physical address - padr (4:19) first failing data word combo register map
pace 1757 m/me page 29 of 34 document # micro-10 rev b combo register map definitions control register (1f50/9f50) (default = 00c6h) qr1 enable error detection/correction or parity checking/generation for memory addresses 00000h-3ffffh. qr2 enable error detection/correction or parity checking/generation for memory addresses 40000h-7ffffh qr3 enable error detection/correction or parity checking/generation for memory addresses 80000h-bffffh. qr4 enable error detection/correction or parity checking/generation for memory addresses c0000h-fffffh. odd enable odd parity, 1 = odd, 0 = even eei enable error detection/correction (edac) on instruction fetch only. eed enable error detection/correction (edac) on operand (data) fetch only. epr enable parity detection function. (if both epr and either eei or eed are enabled, eei or eed will take preference.) spd enable 1 wait state on mmu cache miss cycle (1 = 1 wait, 0 = no wait). wpt enable protected write strobe (wr prot pin). 1: wr prot = write protected strobe 0: wr prot = write protect level (1 = write protect memory) eb1 enable block 1 of unimplemented memory (as defined in unimplemented memory register 1). eb2 enable block 2 of unimplementd memory (as defined in unimplemented memory register 2). eio enable illegal pio detection (as defined in last implemented input and output registers, and mil-std-1750a reserved i/o space). gpt enable global memory protect (set by reset, and reset by i/o command 4003). dmx demultiplexed address/data bus in dma cycles. dlp logical/physical dma (1 = logical, 0 = physical). control register 1 (1f51) (default = c3ffh) wa0/ number of wait states on rdya wa1 spi enable illegal pio detection for mil- std1750a spare i/o spaces. peg determines what is generated when both edac and parity checks are disabled. idl enables/disables the genertion of an idle cycle betwee bus req and bus gnt, during read cycles, allowing for one additional clock cycle to release the ib. unimplemented memory register 1 (1f55) bl1 lo low boundary of unimplemented block 1 of memory. bl1 hi high boundary of unimplemente block 1 of memory. unimplemented memory register 2 (1f56) bl2 lo low boundary of unimplemented block 2 of memory. bl2 hi high boundary of unimplemented block 2 of memory. first unimplmented output command register (1f57) bits 0:5 not used. bits 6:15 first unused sequential pio output command. first unimplmented input command register (1f58) bits 0:5 not used. bits 0:6 first unused sequential pio input command. first failing address register (1f59) padr (4:19) 16 lsb of the physical address of the first failure. first failing data register (1f5b) bits 0:15 "1" indicates the position of the wrong/ corrected bit in the data word. memory fault status register (a00d) lpa page address within the group. id instruction/data as group address.
pace 1757 m/me page 30 of 34 document # micro-10 rev b pic register map control register (1f40, 9f40) 0123456789101112131415 pr1 pr2 pr3 pr4 odd est ead exr spi cnf eb1 eb2 eio lio lme 0 status register (9f41) 0123456789101112131415 cpu cmb pic stb adr twd tbt ifl memory ready program register (1f42, 9f42) 0123456789101112131415 i/o ready program register (1f43, 9f43) 0123456789101112131415 program register (1f44, 9f44) 0123456789101112131415 ebt sbt ewd swd watch dog timer (1f45, 9f45) 0123456789101112131415 unimplemented memory register (1f46, 9f46) 0123456789101112131415 first unimplemented output command (1f47, 9f47) 0123456789101112131415 xxxxxx first unimplemented input command (1f48, 9f48) 0123456789101112131415 xxxxxx first failing address register (9f49) 0123456789101112131415 ioq3 io q4 bl2 hi io q1 clock frequency (mhz) reserved watchdog setup count bl1 lo bl1 hi bl2 lo first unimplemented output command first unimplemented input command first failing address reserved reserved mem q1 mem q2 mem q3 mem q4 io q2
pace 1757 m/me page 31 of 34 document # micro-10 rev b pic register map definitions control register (default = 0000) pr1 enable parity checking/generation for memory addresses 0000-3fff. pr2 enable parity checking/generation for memory addresses 4000-7fff. pr3 enable parity checking/generation for memory addresses 8000-bfff. pr4 enable parity checking/generation for memory addresses c000-ffff. odd enable odd parity. est enable three state control on pic generated strobes: ior, iow, memr, memw. ead enable three state control on pic generated address: a 0 -a 15 . exr extends ready generation over the full i/o space when = 1. (default = 0) spi enables iilegal pio detection for mil-std- 1750a spare i/o spaces. 1 = spare i/o legal, 0 = default = spare i/o illegal. cnf edac function on mmu/combo; 1 = used, 0 = not used. eb1 enable block 1 of unimplemented memory, as defined in the unimplemented memory register. eb2 enable block 2 of unimplemented memory, as defined in the unimplemented memory register eio enable illegal pio detection, as defined in last implemented input and output registers. lio enable long i/o ready generation, 1ms to 15ms, i/o addresses 0000-00ff, 8000- 80ff. lme enable long memory ready generation, 1ms to 15ms, addresses 0000-3fff. status register (default = 0000) cpu cpu passed pic system test. cmb combo chip passed pic system test. pic pic chip passed pic system test. stb reserved. adr reserved. twd watch dog reached terminal count. tbt bus time-out reached terminal count. ifl interrupt flag-shows the last interrupt i/o command implemented in the software. memory ready program register (default = ffff) mem q1 lower block number of wait states. mem q2 second block number of wait states. mem q3 third block number of wait states. mem q4 upper block number of wait states. i/o ready program register (default = undefined) io q1 lower section number of wait states. io q2 second section number of wait states. io q3 third section number of wait states. io q4 upper section number of wait states. program register (default = 0000) cfb 0:5, clock frequency bits (mhz). ebt enable bus time-out function. sbt select bus time-out limit; 1 = 128 cycles, 0 = 64 cycles. ewd enable watch dog function. swd select watch dog clock, 1 = 1khz, 0 = 1mhz. watch dog timer register (default = 0000) bits 0:15, watch dog set-up count. unimplemented memory register (default = undefined) bl1 lo low boundary of unimplemented block 1 of memory. bl1 hi high boundary of unimplemented block 1 of memory. bl2 lo low boundary of unimplemented block 2 of memory. bl2 hi high boundary of unimplemented block 2 of memory. first unimplemented output command register (default = undefined) bits 0:5 not used. bits 6:15 first unused sequential pio output command. first unimplemented input command register (default = undefined) bits 0:5 not used. bits 6:15 first unused sequential pio input command. first failing register (default = undefined) bits 0:15 16 lsb of the physical address of the first failure.
pace 1757 m/me page 32 of 34 document # micro-10 rev b package outline
pace 1757 m/me page 33 of 34 document # micro-10 rev b a 130 10 175 20 a1 n/a 25 5 b 8 2 8 2 c 6 2 6 1 d 1750 15 1450 10 d1 1150 12 1150 12 d2 875 ref 875 ref e 1750 5 1450 10 e1 1150 12 1150 12 e2 875 ref 875 ref l1 n/a 75 15 l2 n/a 25 5 l 300 5 150 10 r1 n/a 25 2 r2 n/a 25 2 o1 n/a 4 0 7 o2 n/a 0 7 g 88 4 n 144 144 straight leads gullwing leads 1757m/me 144-lead quad flatpack outline ordering info
pace 1757 m/me page 34 of 34 document # micro-10 rev b revisions document number : micro-10 document title : pace1757m/me complete embedded cpu subsystem rev. issue date orig. of change description of change orig may-89 rkk new data sheet a jul-04 jdb added pyramid logo b sep-05 jdb re-created electronic version

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