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Ordering number : EN4521
CMOS LSI
LC78681E
Digital Signal Processor for Compact Disc Players
Overview
The LC78681E is a CMOS LSI providing digital signal processing (DSP) and servo control for compact disc players and other audio devices, including laser disc players and equipment using compact disc video (CD-V) and compact disc interactive (CD-I) formats. Functions include the demodulation of EFM (eight-tofourteen modulation) signals from optical pickups, deinterleaving, detection and correction of error signals, and signal processing for digital filters as well as other features that can help reduce player cost. The LC78681E also processes commands from the microprocessor for the servo system. Direct interface is also possible with the Sanyo LC7883K and LC78835, which are serial input D/A converters with on-chip digital filters.
Functions
* HF signals that are input are sliced at an accurate level, converted to EFM signals, and undergo phasecomparison with VCO for PLL playback at an average of 4.3218 MHz. * Through external connection of a 16.9344 MHz crystal oscillator, all required timing signals can be generated on-chip, including the standard clock. * Frame phase difference signals made from the playback clock and the reference clock can control the speed of the disc motor. * Performs detection, protection, and interleaving of frame synchronization signals, ensuring stable data reading. * Demodulates EFM signals and performs conversion to 8-bit symbol data. * Separates subcodes from EFM demodulation signals for output to an external microprocessor. * After CRC checking, Q subcode signals are output to the microprocessor by the serial I/O interface (LSB-first
output selectable). * On-chip RAM performs buffering for EFM demodulation signals, as well as absorbing up to 4 frames of jitter due to fluctuations in the speed of disc rotation. * Performs unscrambling and deinterleaving for rearranging the EFM demodulation signals into the specified sequence. * Performs detection and correction of error signals, as well as error flag processing (double C1 and double C2 error correction system). * Compares the results of the C1 flag and the C2 check to set the C2 flag, and performs signal interpolation and previous-value hold according to the C2 flag. The interpolator uses 4-interpolation, where 0 volt down is performed when the C2 flag is set four times in a row. * Performs functions such as track jump, focus start, disc motor start and stop, muting on and off, and track count when the appropriate command is input from the microprocessor (8-bit serial input). * Features on-chip digital out. * Can perform the desired track counting. High-speed access is possible. * Uses zero cross-muting. * Fully supports double-speed dubbing. * Supports all types of D/A conversion. * Features on-chip digital level meter and peak meter functions. * Supports bilingual function.
Features
* * * * Compact and space-saving 64-pin QFP package Silicon-gate CMOS design (low power dissipation) Single 5 V power supply (suitable for portable sets) DEMO pin for improved operability in adjustment
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
O3098HA (OT)/D2593JN B8-0235 No. 4521-1/23
LC78681E
Package Dimensions
unit: mm 3159-QFP64E
[LC78681E]
SANYO: QFP64E
Equivalent Circuit
No. 4521-2/23
LC78681E
Pin Assignment
Top view
Specifications
Absolute Maximum Ratings at Ta = 25C, VSS = 0 V
Parameter Maximum supply voltage Maximum input voltage Maximum output voltage Allowable power dissipation Operating temperature Storage temperature Symbol VDD max VIN max VOUT max Pd max Topr Tstg Conditions Ratings VSS - 0.3 to 7 VSS - 0.3 to VDD + 0.3 VSS - 0.3 to VDD + 0.3 300 -30 to +75 -40 to +125 Unit V V V mW C C
No. 4521-3/23
LC78681E
Allowable Operating Ranges at Ta = 25C, VSS = 0 V
Ratings Parameter Supply voltage Symbol VDD VIH (1) Input high level voltage VIH (2) VIH (3) VIH (4) VIL (1) Input low level voltage VIL (2) VIL (3) VIL (4) Data setup time Data hold time High level clock pulse width Low level clock pulse width Data read access time Command output time Sub-Q read enable time Subcode read cycle Subcode read enable Crystal oscillator frequency Operating frequency range t set up t hold tWoH tWoL tRAC tRWC tSQE t sc t se fX'tal f op (1) f op (2) VDD TEST1 to 5, AI, FZD, HFL, DEMO, M/L, RES SBCK, RWC, COIN, CQCK, CS EFMIN TES TEST1 to 5, AI, FZD, HFL, DEMO, M/L, RES SBCK, RWC, COIN, CQCK, CS EFMIN TES COIN, RWC: Figure 1 RWC: Figure 1 SBCK, CQCK: Figures 1, 2 and 3 CQCK, SBCK: Figures 1, 2 and 3 Figures 2 and 3 RWC: Figure 1 Figure 2, no RWC signal Figure 3 Figure 3 XIN, XOUT AI EFMIN: VIN 1 Vpp 2.0 400 16.9344 20 10 Conditions min 4.5 0.7 VDD 2.2 0.6 VDD 0.8 VDD VSS VSS VSS VSS 400 400 400 400 0 1000 11.2 136 400 typ max 5.5 VDD VDD VDD VDD 0.3 VDD 0.8 0.4 VDD 0.2 VDD Unit V V V V V V V V V ns ns ns ns ns ns ms s ns MHz MHz MHz
Electrical Characteristics at Ta = 25C, VSS = 0 V, VDD = 5 V
Ratings Parameter Current drain Symbol IDD IIH (1) Input high level current IIH (2) Input low level current IIL (1) AI, EFMIN, FZD, TES, SBCK, COIN, CQCK, RES, HFL, RWC, M/L: VIN = VDD TEST1 to 5, DEMO, CS: VIN = VDD = 5.5 V AI, EFMIN, FZD, TES, SBCK, COIN, CQCK, RES, HFL, RWC, M/L: VIN = VSS AO, PDO, EFMO, EFMO, CLV+, CLV -, FOCS, FSEQ, PCK, TOFF, TGL, THLD, JP+, JP-, EMPH, EFLG, FSX, V/P: IOH = -1 mA DOUT: IOH = -12 mA LASER, SQOUT, 16M, 4.2M, CONT, WCLK, TEST7, LRCLK, WRQ, C2F, DFOUT, DACLK, SFSY, LRSY, SBSY, CK2, PW, ROMOUT, C2FCLK: IOH = -0.5 mA 25 -5 Conditions min typ 17 max 30 5 75 Unit mA A A A
VOH (1) VOH (2)
VDD - 1 VDD - 0.5
V
Output high level voltage
V
VOH (3)
VDD - 1
V
Continued on next page.
No. 4521-4/23
LC78681E
Continued from preceding page.
Ratings Parameter Symbol Conditions AO, PDO, EFMO, EFMO, CLV+, CLV -, FOCS, FSEQ, PCK, TOFF, TGL, THLD, JP+, JP-, EMPH, EFLG, FSX, V/P: IOL = 1 mA DOUT: IOL = 12 mA LASER, SQOUT, 16M, 4.2M, CONT, WCLK, TEST7, LRCLK, WRQ, DFOUT, DACLK, SFSY, CK2, PW, ROMOUT, C2FCLK, C2F, LRSY, SBSY: IOL = 2 mA FST: IOL = 5 mA PDO, FST: VOH = VDD PDO, FST: VOL = VSS -5 min typ max Unit
VOL (1) VOL (2) Output low level voltage VOL (3)
1
V
0.5
V
0.4
V
VOL (4) Output off leakage current IOFF (1) IOFF (2)
0.75 5
V A A
Figure 1 Command Input
Figure 2 Subcode Q Output
No. 4521-5/23
LC78681E
Figure 3 Subcode Output
Pin Description
No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 Name TEST1 AO AI PDO VSS EFMO EFMO EFMIN TEST2 CLV+ CLV- V/P FOCS FST FZD HFL TES PCK FSEQ TOFF TGL THLD TEST3 VDD JP+ JP- DEMO TEST4 EMPH NC WCLK TEST7 LRCLK NC DFOUT DACLK TEST6 O O O O O O I/O I O I O -- O O I I O O O O O I I I O O O O O I -- O O I I O Generates kick pulse, JP+, or JP- according to track jump command. Jumps the specified number of tracks (1, 2, 4, 16, 32, 64, or 128). LSI test input. Normally unconnected. +5 V Generates kick pulse, JP+, or JP- according to track jump command. Jumps the specified number of tracks (1, 2, 4, 16, 32, 64, or 128). Sound generation function for set adjustment. LSI test input. Normally unconnected. Deemphasis required when high. Not connected. Signal output to D/A converter. Outputs latch signal and signals for left-right switching and sample holding. LSI test input. Normally unconnected. Signal output to D/A converter. Outputs latch signal and signals for left-right switching and sample holding. Not connected. Signal output to D/A converter. Outputs latch signal and signals for left-right switching and sample holding. LSI test input. Normally unconnected. Focus servo is switched off when FOCS is high. Lens is lowered by FST and raised gradually when FOCS is high. Generation of FZD resets FOCS. Used for focus servo control. Generates kick pulse, JP+, or JP- according to track jump command. Jumps the specified number of tracks (1, 2, 4, 16, 32, 64, or 128). 4.3218 MHz PCK monitor output. High when SYNC (true frame sync) detected from the EFM signal matches SYNC from counter (interleaving frame sync). (Single-frame latch output.) LSI test input. Normally unconnected. Disc motor control outputs. Output is high with constant linear velocity rough servo, and low during phase control Inputs 1 to 2 VPP HF signal to EFMIN. Complementary EFM signal output is made from EFMO and EFMO via the amplitude limiter. These are used for slice level control. GND LPin for input of the on-chip VCO output from the LA9210 (8.6436 MHz). Phase detector output (PDO) is phased output with the EFM signal, set so that frequency is raised by positive voltage. LSI test input. Normally unconnected. Description
Continued on next page. No. 4521-6/23
LC78681E
Continued from preceding page.
No. 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Name LRSY CK2 ROMOUT C2FCLK C2F DOUT SBSY EFLG PW SFSY SBCK FSX WRQ RWC SQOUT COIN CQCK RES M/L LASER 16 M 4.2 M CONT TEST5 CS XIN XOUT I/O O O O O O O O O O O I O O I O I I I I O O O O I I I O Set to low at powerup. Same as for pins 50 to 54. Permits control via serial control from the microprocessor. 16.9344 MHz output pin 4.2336 MHz output pin. Permits control via serial control from the microprocessor. LSI test input. Normally unconnected. Chip select pin. The LC78681 is active when this pin is low (on-chip pull-down resistor). 16.9344 MHz crystal oscillator connection pins. WRQ goes high when Q subcode data passes the CRC check. Through external connection and sending of CQCK, data is read from SQOUT. Set MSB-first/LSB-first to low when data in LSB-first format is desired. Command is generated by sending output synchronized with CQCK command data after setting microprocessor RWC to high. 7.35 kHz synchronization signal output SFSY is subcode frame synchronization signal. P, Q, R, S, T, U, V, and W subcodes are read out by sending clock eight times to SBCK. Digital OUT output Subcode block synchronization output C1 and C2 single and double error correction flag. For output of CD-ROM interface signals. Description
Functional Description
HF Signal Input Circuit (pin 8: EFMIN, pin 7: EFMO and pin 6: EFMO) An EFM signal (NRZ) sliced at the optimum level is obtained when the HF signal is input on EFMIN.
No. 4521-7/23
LC78681E PLL Clock Regeneration Circuit (pin 4: PDO, pin 3: AI, and pin 2: AO)
A PLL comprising a VCO can be made with an LA9210. Output from the PDO pin goes positive when the VCO phase is lagging. VCO Half-Frequency Clock (pin 18: PCK) This pin monitors a signal generated by dividing the VCO frequency by two. This signal has an average frequency of 4.3218 MHz. Frame Synchronization Detector Monitor (pin 19: FSEQ) FSEQ is latched high for one frame when the frame sync (true synchronization signal) recovered from the EFM signal matches the sync timing generated by an internal counter. Servo Command Function (pin 51: RWC, pin 53: COIN, pin 54: CQCK and pin 62: CS) Commands can be input by setting RWC high and issuing the command synchronized to the CQCK clock from COIN. Focus start Track jump Mute control Disc motor control Other control commands Track count 1. 1-byte Commands
1-byte commands
2-byte command
No. 4521-8/23
LC78681E 2. 2-byte Commands
The commands are executed on the falling edge of RWC. Focus Servocontroller (pin 13: FOCS, pin 14: FST, pin 15: FZD and pin 57: LASER)
MSB LSB Command FOCUS START #1 FOCUS START #2 LASER ON LASER OFF NOTHING RES = low
00001000 10100010 00001010 10001010 00000000
1. Laser Control
2. Focus Start When a Focus Start command (either 1 or 2) is issued, the pickup lens is first lowered as C1 discharges through FST and then raised gradually as C1 is recharged by FOCS. FZD goes low when the focal point is reached, and FOCS is reset and the focus servocontroller turned on when this signal is received. After issuing this command, the microprocessor checks the DRF signal from the LA9210 to verify that focus has been reached, and advances to the next step. If C1 recharges fully before focus has been reached, the Focus Start command should be reissued to repeat operation of the focus servocontroller.
No. 4521-9/23
LC78681E
Note: If for Focus Start 2, the value in parentheses is in effect only when FST is low (unlike Focus Start 1).
Notes: 1. The falling edge of FZD is not accepted when FST is low. 2. After a Focus Start command has been issued, the focus servocontroller is reinitialized when RWC goes high. For this reason, a new command should not be issued until the S-curve for the focus coil drive has been completed. 3. If focus cannot be reached (i.e., the FZD signal does not go low), the FOCS signal remains high and the lens remains raised. In this case, the Nothing command should be issued to reinitialize the servocontroller. 4. When the RES pin is set low, LASER is directly set high. 5. Focus start using the DEMO pin is in mode 1.
Constant Linear Velocity Servocontroller (pin 10: CLV +, pin 11: CLV - and pin 12: V/P)
MSB LSB Command DISC MOTOR START (accelerate) DISC MOTOR CLV (CLV) DISC MOTOR BRAKE (decelerate) DISC MOTOR STOP (stop) RES = low
00000100 00000101 00000110 00000111
The disc motor accelerates when CLV+ is high and decelerates when CLV- is high. These outputs are selected by the motor mode commands issued by the microprocessor (accelerate, decelerate, CLV, or stop). The CLV+ and CLV- outputs for each mode are shown in the following table.
Mode Accelerate Decelerate CLV Stop CLV+ High Low * Low CLV- Low High * Low
No. 4521-10/23
LC78681E
Note: * For constant linear velocity servo control commands, the TOFF pin is low only in the CLV mode; otherwise it is high. Control of the TOFF pin by command is effective only in the CLV mode.
1. CLV Mode * In the CLV (constant linear velocity) mode, the LC78681E detects disc speed from the HF signal and switches the internal DSP mode to perform various types of control for maintaining the correct linear velocity. The pulse-width modulation cycle is 7.35 kHz, and the 1/64 duty cycle is 1.114 s. V/P outputs high during rough servo and low during phase control.
Internal mode Rough servo (velocity too low) Rough servo (velocity too high) Phase control (PLCK locked) CLV+ High Low PWM CLV- Low High PWM V/P High High Low
2. CLV Control Gain Switching
MSB LSB Command DISC 8 set DISC 12 set RES = low
10101000 10101001
CLV control gain during rough switching for 8-cm discs can be set at 8.5 dB lower than for 12-cm discs. 3. Internal Brake Mode
MSB LSB Command Internal brake on Internal brake off Internal brake control RES = low
11000101 11000100 10100011
*
The internal brake mode is enabled when an Internal Brake On command (C5H) is input. Executing a Brake command (06H) in this mode allows the deceleration of the disk to be monitored at the WRQ pin. In this mode, the EFM signal density per frame can be counted to determine the status of disc deceleration. When there are fewer than four EFM signals, CLV- falls to low, and the WRQ pin simultaneously goes high to indicate that brakes is completed. The microprocessor issues a Stop command when it senses that the WRQ pin is high, thereby completing the stopping of the disc.
*
No. 4521-11/23
LC78681E
Notes: 1. When EFM signal noise results in errors in deceleration state determination, it may be advantageous to use the internal brake control command (A3H) to change the EFM signal count from four to eight. 2. If focus is lost during execution of an internal brake command, it is necessary to first refocus and then input the internal brake command again. 3. Due to the possibility of state determination errors due to the EFM signal playback state (e.g., damaged disk or access in progress) we recommend that this product be used in conjunction with a microprocessor. Track Jump Circuit (pin 16: HFL, pin 17: TES, pin 20: TOFF, pin 21: TGL, pin 22: THLD, pin 25: JP + and pin 26: JP -) 1. Internal Track Count The following two modes are available.
MSB LSB Command New track count (combination of TES and HFL) Standard track count (direct count of the TES signal) RES = low
00100010 00100011
The standard track count uses the TES signal without modification as the internal track count clock. In order to reduce counting errors due to noise on the rising and falling edges of the TES signal, the new track counter suppresses this noise through combination with the HFL signal, enabling an accurate track count. However, if the HFL signal is lost because of foreign matter or scratching on the disk, no track count pulse may be generated. For this reason, caution is required when using this mode.
No. 4521-12/23
LC78681E 2. Track Jump Commands
MSB LSB Command Standard track jump New track jump 1 TRACK JUMP IN #1 1 TRACK JUMP IN #2 1 TRACK JUMP IN #3 2 TRACK JUMP IN 4 TRACK JUMP IN 16 TRACK JUMP IN 32 TRACK JUMP IN 64 TRACK JUMP IN 128 TRACK JUMP IN 1 TRACK JUMP OUT #1 1 TRACK JUMP OUT #2 1 TRACK JUMP OUT #3 2 TRACK JUMP OUT 4 TRACK JUMP OUT 16 TRACK JUMP OUT 32 TRACK JUMP OUT 64 TRACK JUMP OUT 128 TRACK JUMP OUT 256 TRACK CHECK TOFF TON TRACK JUMP BRAKE RES = low
10100000 10100001 00010001 00010010 00110001 00010000 00010011 00010100 00110000 00010101 00010111 00011001 00011010 00111001 00011000 00011011 00011100 00111000 00011101 00011111 00010110 00001111 10001111 10001100
When a track jump command is issued to the servocontroller, an acceleration pulse is generated (a period), followed by a deceleration pulse (b period) and braking (c period), completing the specified jump. TES and HFL input during braking detects the direction of beam slippage, and the portion of the TE signal that compensates for slippage is cut off by TOFF, which, together with boosting of the servo gain by TGL, supplements the destination track for the jump. Note: Of the disc motor control outputs, the TOFF pin is low in the CLV mode, and high in the Start Stop, and Brake modes. TOFF can also be independently switched on or off by the microprocessor. However, disc motor control is enabled only in the CLV mode.
No. 4521-13/23
LC78681E 3. Track Jump Modes The relationship between acceleration pulses, deceleration pulses, and brake periods is shown in the following table.
Command 1 TRACK JUMP IN (OUT) #1 1 TRACK JUMP IN (OUT) #2 1 TRACK JUMP IN (OUT) #3 2 TRACK JUMP IN (OUT) 4 TRACK JUMP IN (OUT) 16 TRACK JUMP IN (OUT) 32 TRACK JUMP IN (OUT) 64 TRACK JUMP IN (OUT) 128 TRACK JUMP IN (OUT) 256 TRACK CHECK TRACK JUMP BRAKE 2-track jump 9-track jump 18-track jump 36-track jump 72-track jump 233 s 0.5-track jump 0.5-track jump Standard track jump mode a 233 s 233 s 233 s b 24 ms 24 ms Does not occur c 233 s 0.5-track jump 0.5-track jump 1-track jump 2-track jump 9-track jump 18-track jump 36-track jump 72-track jump a 233 s a period a period a period a period a period 14-track jump 28-track jump 56-track jump New track jump mode b 24 ms 24 ms Does not occur Does not occur 24 ms 24 ms 24 ms 24 ms 24 ms 24 ms 24 ms c
There are no a, b, or c periods. 466 s 7-track jump 14-track jump 28-track jump 56-track jump 24 ms 24 ms 24 ms 24 ms 24 ms 24 ms 24 ms
TOFF goes high after 256 tracks are jumped. The a and b pulses are not output. There are no a or b periods.
TOFF goes high after 256 tracks are jumped. The a and b pulses are not output. There are no a or b periods.
Notes: 1. The actuator drive signals are not generated for the 256-track Check. Instead issuance of a feed motor signal is required because the TES signal is in the track-count mode and the tracking servocontroller is off. 2. The servocontroller register is automatically reset after one a, b, and c track jump sequence. 3. When a new track jump command is issued while a previous command is still being processed, the new command is executed immediately.
4. Track Check Mode
MSB LSB Command Track Count In Track Count Out 2-byte COMMAND RESET RES = low
11110000 11111000 11111111
A Track Count In or Track Count Out command followed by a binary number between 16 and 256 can be used to start track counting for the specified number of tracks.
No. 4521-14/23
LC78681E Notes: 1. The fall of RWC when the desired number of tracks is input in binary format starts the track count. 2. During track counting, TOFF is high and the tracking servocontroller is turned off. For this reason, issuance of a feed motor signal is required. 3. The Track Count In and Track Count Out commands cause the WRQ signal to change from the Q subcode standby monitor when normal to the track count monitor. WRQ goes high at half the track count and low again at the end of the count. The microprocessor monitors WRQ to detect track count completion. 4. When a 2-byte Command Reset command is not issued, the track count starts again. For example, to advance 20,000 tracks, the microprocessor can set the track count number to 200 and wait 100 WRQ pulses. 5. The Brake command is used to bring the pickup to the track when counting is finished. Error Flag Output (pin 45: EFLG and pin 49: FSX)
The 7.35 kHz FSX frame synchronization signal is divided down from the reference clock. The status of error correction in each frame is output on EFLG, as shown in the figure, where the number of high pulses in each FSX period indicates the quality of the replay signal. P, Q, and R through W Subcode Output Circuit (pin 46: PW, pin 44: SBSY, pin 47: SFSY and pin 48: SBCK) PW is the subcode signal output pin. The falling edge of SFSY starts the 136 s period during which SBCK is clocked eight times, allowing all codes -- P, Q, and R through W -- to be read. The signals appearing at the PW pin change with the rising edge of SBCK. When SBCK is static, the P code is input to PW. SFSY is the signal output for each subcode frame, and the rising edge of this signal indicates standby status for output of the subcode symbols (P through W). Subcode data P if output simultaneously with the falling edge of this signal.
SBSY is output for each subcode block. It is high during the S0 and S1 synchronization cycles. Its falling edge indicates the end of synchronization and the start of EIAJ-format data within the subcode block.
No. 4521-15/23
LC78681E Q Subcode Output Circuit (pin 50: WRQ, pin 51: RWC, pin 52: SQOUT, pin 54: CQCK, pin 56: M/L and pin 62: CS)
MSB LSB Command ADDRESS FREE ADDRESS 1 RES = low
00001001 10001001
Q subcode data can be read from the SQOUT pin by clocking the CQCK pin. Of the 8-bit subcode data, the Q signal is effective for operations such as song access and display. WRQ is high only when the block CRC is correct and the address in the Q subcode format is 1*.When the microprocessor senses that WRQ is high and issues CQCK, data can be read from SQOUT in the sequence indicated below. When CQCK is activated, the DSP disables internal register updating. When the microprocessor finishes reading data, it briefly sets RWC high to reenable data updating and resets WRC low. CQCK should start to oscillate in the 11.2 ms period during which WRQ is high. Data can be read in LSB-first format when M/L is low and in MSB-first format when it is high. Note: * This condition is ignored when the Address Free command is issued. (The Address Free command is used in CD-V applications.)
M/L is high M/L is low CONT TNO INDEX (POINT)* MIN The order of data output remains unchanged whether M/L is high or low. SEC FLAME ZERO AMIN (PMIN)*/PKMIN ASEC (PSEC)*/PKSEC AFLAME (PFLAME)*/PKFLAME LVM/PKM 16-bit data LVM data/PKM data LVM data/PKM data ADR
Note: * Items in parentheses are for the disc lead-in area.
No. 4521-16/23
LC78681E
Notes: 1. The WRQ pin normally indicates Q subcode standby status, but provides different information during the Track Count mode or internal braking. (See the sections on track counting and internal braking.) 2. The LC78681E is active when CS is low, with output from SQOUT. SQOUT is in the high-impedance state when the CS pin is high.
Reading Level Meter (LVM) and Peak Meter (PKM) Data
MSB LSB Command PKM set (LVM reset) LVM set (PKM reset) PKM mask set PKM mask reset RES = low
00101011 00101100 00101101 00101110
1. Level Meter (LVM) * * The Level Meter mode is enabled by inputting the Level Meter Set command (2CH). Level meter data is 16 bits, and is composed of 15 bits of absolute-value data and an MSB indicating left-right polarity. Data is for the left channel when the MSB is high and for the right channel when low. Level meter data is appended at the end of 80 bits of Q subcode data, and can be read from the SQOUT pin by clocking the CQCK pin 96 times. The left and right channels are swapped each time that level meter data is read. The left and right channels are independent, and the highest value read for each of the channels is held.
*
2. Peak Meter (PKM) * * The Peak Meter mode is enabled by inputting the Peak Meter Set command (2BH). Peak meter data is 16 bits, and is composed of 15 bits of absolute-value data and an MSB fixed at 0. The maximum value is detected with no regard for right or left channel. Peak meter data is read in a manner similar to that for level meter data. However, data is not updated by further reading. The absolute time for Q subcode data when in the Peak Meter mode is issued while holding the absolute time (ATIME) that is detected after generation of the maximum value. (Relative time is normal operation.) Issuing a Peak Meter Mask Set command causes values larger than the maximum value already in memory to be ignored, even when this command is issued in the Peak Meter mode. This is canceled by the Peak Meter Mask Reset command (used in peak searches for songs in memory).
*
*
*
No. 4521-17/23
LC78681E Mute Control Circuit
MSB LSB Command Mute Mute Mute 0 dB -12 dB dB RES = low
00000001 00000010 00000011
Volume can be reduced by 12 dB (MUTE -12 dB) or muted fully (MUTE dB) by issuing the commands shown above. Muting switches at zero crossings to prevent switching noise on the audio output. A zero crossing is judged to be any data where the upper seven bits are all 1 or all 0. Bilingual Function
MSB LSB Command STO CONT Lch CONT Rch CONT RES = low
00101000 00101001 00101010
*
The left and right channels are output to the left and right channels when reset or when the Stereo command (28H) is issued. Left channel data is output to both the left and right channels when the Left Channel Set command (29H) is issued. Right channel data is output to both the left and right channels when the Right Channel Set command (2AH) is issued.
* *
Deemphasis Control (pin 29: EMPH) The preemphasis on/off bit in the Q subcode data is output on EMPH. Deemphasis is required when EMPH is high. D/A Converter Interface (pin 31: WCLK, pin 33: LRCLK, pin 35: DFOUT and pin 36: DACLK) D/A converter data is output in MSB-first format from DFOUT, in synchronization with the falling edge of DACLK.
MSB LSB Command CD-ROM XA CONT and CD-ROM XA Reset RES = low
10001000 10001011
Issuing the CD-ROM XA command causes data which does not undergo interpolation or muting control to be output on DFOUT (when CD-ROM XA is supported). Because the Reset command for CD-ROM XA is common with the CONT reset on pin 60, caution is required. * LC78681 D/A Converter Interface
No. 4521-18/23
LC78681E Output for CD-ROM (pin 39: CK2, pin 37: LRSY, pin 40: ROMOUT: pin 42: C2F and pin 41: C2FCLK) Data from the ROMOUT pin which is synchronized with the LRSY signal is output in MSB-first format. Because this data has not been processed by either the interpolation, previous-value hold, or digital filtering circuits, it is suitable for CD-ROM IC input. CK2 is a 2.1168 MHz clock, and data is output on its rising edge. C2F flags 8-bit units of data, and is synchronized to C2FCLK. LC8951 and LC78681 Interface
Digital Audio Out Circuit (pin 43: DOUT) This is the output pin for the digital audio interface, with output in EIAJ format. The signal is output after interpolation and muting. This output pin has a built-in driver, and can drive a transistor directly.
MSB LSB Command DOUT ON DOUT OFF UBIT ON UBIT OFF RES = low
01000010 01000011 01000000 01000001
* *
The digital out pin can be fixed low by issuing the DOUT OFF command. The UBIT data in the DOUT data can be fixed at 0 by issuing the UBIT OFF command.
Control Pin (pin 60: CONT)
MSB LSB Command CONT set CONT and CD-ROM XA Reset RES = low Low
00001110 10001011
The CONT pin can be set high by issuing the CONT Set command. Crystal Oscillator (pin 63: XIN and pin 64: XOUT)
MSB LSB Command OSC ON OSC OFF Double-speed mode Normal mode VCO 8 M VCO 16 M RES = low 10001110 10001101 11000001 11000010 01100000 01100001
No. 4521-19/23
LC78681E A clock to serve as a time base can be obtained by connecting a 16.9344 MHz crystal to XIN and XOUT. The OSC OFF command stops oscillation of the crystal and the VCO. The double-speed mode can also be enabled through the use of commands. The relationship between the crystal and VCO is shown below.
VCO playback speed
Mode 8M Normal speed mode Double speed mode -- 8.6436 MHz 17.2872 MHz 8.6436 MHz 4.3218 MHz 17.2872 MHz 8.6436 MHz 4.3218 MHz
Mode 16M Normal speed mode -- Double speed mode --
After reset AI pin external input (8M VCO) AI pin external input (17M VCO) AI pin external input (LA9210) PCK monitor output
17.2872 MHz
8.6436 MHz
Recommended crystal oscillator constants
Manufacturer CITIZEN WATCH CO., LTD. Oscillator CSA-309 (16.9344 MHz) Cin/Cout 6 pF to 10 pF (Cin = Cout)
4.2M and 16M Pins (pin 59: 4.2M and pin 58: 16M) Buffered 16.9344 MHz output from an externally connected 16.9344 MHz crystal is output from 16 M. It is also divided by four to generate a 4.2336 MHz clock that is output on 4.2 M. When the OSC OFF command has been issued, these outputs are held either high or low. The same frequency is generated in both normal and double-speed modes. Reset Circuit (pin 55: RES) This pin should momentarily be held low after power-on. This is set to - dB for muting or to STOP for the disc motor.
Constant linear velocity servo Muting control Q subcode address conditions Laser control CONT OSC Track jump mode Track count mode START 0 dB Address 1 ON (low) High ON Standard Standard STOP -12 db Address free OFF Low OFF New New (high) BRAKE CLV
No. 4521-20/23
LC78681E The states shown above in boxes are set directly when RES is low.
Audio Output for Calibration (pin 27: DEMO)
Setting this pin high sets muting to 0 dB and the disc motor to constant linear velocity, even when the microprocessor issues no command, and activates focusing. Because this also makes the LASER pin active, EFM signals and audio output can be obtained without the microprocessor as long as the mechanism and servo are hooked up correctly. Other Pins (pin 1: TEST1, pin 9: TEST2, pin 23: TEST4, pin 61: TEST5, pin 37: TEST6 and pin 32: TEST7) These are test pins for the internal circuitry of the LC78681E. TEST1 through TEST5 have internal pull-down resistors. The test inputs can be left open during normal operation.
No. 4521-21/23
LC78681E
Description of Block Operation
1. RAM Address Control The LC78681E incorporates an 8-bit x 2-kbyte RAM buffer, allowing address control to be used to remove from the EFM demodulation data such timing variations, or jitter, that are caused by variations in disc motor speed. The buffer can absorb up to 4 frames of jitter. The buffer controller constantly monitors buffer free space and adjusts the CLV servocontroller divider ratio to keep the data write address in the middle of the buffer (i.e., at zero). If the 4-frame limit is exceeded, the write address is forced to 0, and the output is muted for 128 frames because the resulting error cannot be handled by normal error processing algorithms.
Position -4 or less -3 -2 -1 0 +1 +2 +3 +4 or more Force to 0 589 589 589 588 587 587 587 Force to 0 Decrease ratio Standard ratio Increase ratio Division ratio or processing
C1 and C2 Error Correction After EFM demodulation, data is written to the internal RAM, jitter is absorbed, and the processing described below is carried out under uniform timing according to the crystal clock. First, the C1 stage involves error detection and correction, determination of the C1 flags, and writing to the C1 flag register. Next, the C2 stage involves error detection and correction, determination of the C2 flags, and writing to the internal RAM.
C1 flag No errors 1 error 2 errors 3 errors or more No correction required Correction Correction Correction not possible Error correction and flag processing Flag reset Flag reset Flag set Flag set
C2 flag No errors 1 error 2 errors 3 errors or more No correction required Correction
Error correction and flag processing Flag reset Flag reset
Depends on C1 flags*1 Depends on C1 flags*2
Notes: 1. If the error positions determined in the C2 stage match the C1 flags, correction is carried out and the flags are reset. However, if there are seven or more C1 flags, no correction is made (because of the danger of erroneous correction), and the C1 flags are taken as the C2 flags without change. If one error position matches but another does not, correction cannot be performed. Moreover, if there are five or fewer C1 flags, the results of the C1 stage may be incorrect, and the flag is set. If there are six or more, the situation is handled as uncorrectable, and the C1 flags are taken as the C2 flags without change. Correction is not possible if even only one error position is different, and the flags are set even if there are two or fewer C1 flags, because such data may be erroneous even if it passes the C1 stage. 2. If there are three or more errors and correction is determined to be impossible, no correction is made; if there are two or fewer C1 flags, data which passes the C1 stage may still be corrupt, and so the flags are set. Otherwise the C1 flags are taken as the C2 flags without change.
No. 4521-22/23
LC78681E
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of December, 1998. Specifications and information herein are subject to change without notice. PS No. 4521-23/23

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