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| C68000 16-bit Microprocessor Megafunction General Description The C68000 is megafunction of a powerful 16/32-bit microprocessor and is derived from the Motorola MC68000 microprocessor. The C68000 is a fully functional 32-bit internal and 16-bit external equivalent for the MC68000. The C68000 serves interrupts and exceptions, and provides an interface for M6800 family peripherals. The C68000 is the microcode-free design developed for reuse in ASIC and FPGA implementations. The design is strictly synchronous without internal tri-states and with a synchronous reset. Features * * * * * Control Unit 16-bit two levels instruction decoder Three levels instruction queue 55 instructions and 14 address modes Supervisor and User mode Independent stack for both modes Users registers Eight 32-bit data & address registers 16-bit status register Data format Integer 8, 16 or 32-bit BCD packet Bit Memory interface Independent data and address buses Asynchronous bus control 4 GB-address space 31-bit address bus (optional 32-bit) 8-address spaces (used 5) 16-bit data bus Interrupt Controller Seven Priority Levels Unlimited interrupt sources Vectored or auto-vectored interrupt modes Arithmetic-Logic Unit 8, 16, 32-bit arithmetic and logic operations Boolean manipulations 16 x 16-bit multiplication (sign or unsigned) 32 / 16-bit division (sign or unsigned) M6800 peripherals family synchronous interface Two or Three wire bus arbitration interface Operation execution is the same for data or address registers No different for operation on data or address registers Page 1 Symbol C68000 addr clk addrz datai fc datao dataz e vma vpa_n berr_n ctrlz as_n rw uds_n lds_n reseti_n reseto_n halti_n halto_n dtack_n br_n bg_n bgack_n ipl_n CAST, Inc. March 2004 * * * * * * C68000 Megafunction Datasheet Pin Description Name Type Polarity/ Description Bus size p0i I 8 Port 0: is an 8-bit bi-directional I/O port with separated inputs and outputs. Port 0 is also p0o O 8 the multiplexed low-order address and data bus during accesses to external program and data memories. p1i I 8 Port 1: is an 8-bit bi-directional I/O port with separated inputs and outputs. Port 1 also p1o O 8 serves special features. p2i I 8 Port 2: is an 8-bit bi-directional I/O port with separated inputs and outputs. Port 2 emits p2o O 8 the high-order address byte during fetches from external program memory that use 16-bit addresses (MOVX @DPTR). p3i I 8 Port 3: is an 8-bit bi-directional I/O port with separated inputs and outputs. Port 3 also p3o O 8 serves special features. clk I Rise Clock: Is an input of pulse for internal clock counters and all synchronous circuits rtcx I Rise Timekeeping clock: is a 32.768 kHz pulse supplies the time-base for the Real Time Clock reset I High Hardware reset input: A high on this pin for two clock cycles while the oscillator is running resets the device pfi I High Power Fail Interrupt: The input of off-megafunction voltage comparator, which generates early warning interrupt ea I Low External Access Enable: The `ea' must be externally held low to enable the device to fetch code from external program memory0000H and 0FFFH. If `ea' is held high, the device executes from in-circuit program memory unless the Program counter contains an address greater than 0FFFH. ale O High Address Latch Enable: The output pulse for latching the low byte of the Address during an access to external memory. In normal operations, `ale' is driven at a constant rate of 1/6 the oscillator frequency. psen O Low Program Store Enable: The read strobe to external program memory. When the C68000 is executing code from the external program memory, `psen' is activated each machine cycle, `psen' is not activated during fetches from in-circuit program memory. Internal Program Memory interface: romdatai O 8 Memory data bus romaddr O 14 Memory address bus romoe O High Memory output enable Internal Data Memory interface: ramdatai I 8 Memory data bus input ramdatao O 8 Memory data bus output ramaddr O 8 Memory address bus ramwe O High Memory write enable ramoe O High Memory output enable External Special Function Registers interface: sfrdatai I 8 SFR data bus input sfrdatao O 8 SFR data bus output sfraddr O 7 SFR address bus sfrwe O High SFR write enable sfroe O High SFR output enable Applications * * * * * Microcomputer systems Embedded microcontroller systems Data computation and transfer Communication systems Professional audio and video Page 2 CAST, Inc. C68000 Megafunction Datasheet Block Diagram Data Registers DO D1 D2 D3 D4 D5 D6 D7 TMPD Execution Unit ALU SHIFTER FIND ONE Address Registers A0 A1 A2 A3 A4 A5 A6 A7 TMPA Main Control clk halti_n reseti_n CTRL reseto_n halto_n e 3 Level Instruction Queue Program counter PC fc addr addrz PC Arith Unit datao datai Memory Interface dataz ctrlz as_n rw lds_n uds_n dtack_n br_n Special Registers A7 ' S CC ADDRESS BUS Other special registers DATA BUS bg_n CONTROL BUS bgack_n vma_n vpa_n berr_n Interrupt control ipl_n Interrupt and Exception Control Unit Data Buffer CAST, Inc. Page 3 C68000 Megafunction Datasheet Functional Description The C68000 megafunction is partitioned into modules as shown above and described below. Interface Manages all accesses to memory. Generates all control signals to memory and peripherals. This is a synchronous device working with both rising and falling edge of the clk (clock) signal. Execution Unit Arithmetic-Logic Unit. (ALU) performs: * * * 32-bit arithmetic operations 32-bit logic operations Bit manipulations Deliverables Address/Data Shifter performs various types of shift and rotate operations by one bit position. These two units with some additional logic, allows all basic operation on data and address registers. Program counter The program counter (PC) is 32 bits wide. This register can be incremented or loaded by the control unit during instruction execution. * * * * * * * * * VHDL or Verilog RTL Post-synthesis EDIF netlist (netlist license) Testbench (self checking) Vectors for testing the megafunction Place & Route Scripts (netlist license) Synthesis and simulation scripts Constraint file Instantiation templates Documentation Interrupt control Provides seven priority levels of interrupt and calculates an internal vector during the autovector interrupt. It also holds the internal state of the interrupt and exception level. Verification Methods The C68000 megafunction's functionality was verified by means of a proprietary hardware modeler. The same stimulus was applied to a hardware model that contained the original Motorola MC68000 chip, and the results compared with the megafunction's simulation outputs Data registers Contains eight 32-bit wide data registers (user visible). There is also a temporary data register that is invisible to the user. Address registers Contains eight 32-bit wide address registers (user visible). There is also a temporary data register that is invisible to the user. Special registers Contains the stack pointer, SR and additional special purpose registers. Main control Decodes and executes instructions. Contains main processor sequencer and control unit for all inner resources. CAST, Inc. Page 4 C68000 Megafunction Datasheet Device Utilization & Performance Supported Family Flex Apex Apex2 Cyclone Stratix Stratix-II Device Tested EPF10K130-1 EP20K160E-1 EP2A15C-7 EP1C12C-6 EP1S10C-5 EP2S15C-3 LEs 5823 5496 5507 6152 6560 4758 Memory I/O 60 60 60 60 60 60 Performance Fmax 21 MHz 29 MHz 36 MHz 57 MHz 69 MHz 114 MHz Notes: 1. Optimized for speed Related Information * * M68000 8-/16-/32-Bit Microprocessors User's Manual Ninth Edition (c) Motorola Inc., 1993 Motorola M68000 FAMILY Programmer's Reference Manual (c) Motorola Inc., 1992 Contact Information CAST, Inc. 11 Stonewall Court Woodcliff Lake, New Jersey 07677 USA Phone: +1 201-391-8300 Fax: +1 201-391-8694 E-Mail: info@cast-inc.com URL: www.cast-inc.com This megafunction developed by the processor experts at Evatronix SA Copyright (c) 2004 CAST, Inc. ALL RIGHTS RESERVED CAST, Inc. Page 5 |
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