LC7861KE View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LC7861KE

Digital Signal Processor for Compact Disc Players

SANYO -> Panasonic 

LC7861KE

6. Subcode P, Q, and R to W output circuit; Pin 46: PW, pin 44: SBSY, pin 47: SFSY, pin 48: SBCK

PW is the subcode signal output pin, and all the codes, P, Q, and R to W can be read out by sending eight clocks to

the SBCK pin within 136 µs after the fall of SFSY. The signal that appears on the PW pin changes on the falling

edge of SBCK. If a clock is not applied to SBCK, the P code will be output from PW. SFSY is a signal that is output

for each subcode frame cycle, and the rising edge of this signal indicates standby for the output of the subcode

symbol (P to W). Subcode data P is output on the fall of this signal.

SBSY is a signal output for each subcode block. This signal goes high for the S0 and S1 synchronization signals. The

fall of this signal indicates the end of the subcode synchronization signals and the start of the data in the subcode

block. (EIAJ format)

7. Subcode Q output circuit; Pin 50: WRQ, pin 51: RWC, pin 52: SQOUT, pin 54: CQCK, pin 56: M/L, pin 62: CS

MSB

LSB

00001001

10001001

10001110

10001101

Command

ADDRESS FREE

ADDRESS 1

OSC ON

OSC OFF

RES = low

o

o

Subcode Q can be read from the SQOUT pin by applying a clock to the CQCK pin.

Of the eight bits in the subcode, the Q signal is used for song (track) access and display. The WRQ will be high only

if the data passed the CRC error check and the subcode Q format internal address is 1*. The control microprocessor

can read out data from SQOUT in the order shown below by detecting this high level and applying CQCK. When

CQCK is applied the DSP disables register update internally. The microprocessor should give update permission by

setting RWC high briefly after reading has completed. WRQ will fall to low at this time. Since WRQ falls to low

11.2 ms after going high, CQCK must be applied during the high period. Data can be read out in an LSB first format

if the M/L pin is set low, and in an MSB first format if that pin is set low.

Note: * That state will be ignored if an address free command is sent. This is provided to handle CDV applications.

No. 4818-8/18

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