SAA7381 Просмотр технического описания (PDF) - Philips Electronics
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SAA7381 Datasheet PDF : 108 Pages
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Philips Semiconductors
ATAPI CD-R block decoder
Objective specification
SAA7381
6.1 Detailed description of pin functions
Table 1 Q and R-W input/output subcode connections (4 pins)
SYMBOL
DESCRIPTION
SFSY
3-wire subcode sync
RCK
3-wire subcode clock
SUBI
Q and R-W subcode input
COMMENT
input subcode frame sync for receiving 3-wire subcode; output
subcode frame sync for transmitting 3-wire subcode
output bit clock for receiving 3-wire subcode; input bit clock for
transmitting 3-wire subcode
configurable for 3-wire or Philips V4 subcode mode; can use either
RCK or WSI1 as clock references with appropriate dividers
Table 2 I2S-bus multimedia audio output (5 pins)
SYMBOL
MCK
SCK2
DESCRIPTION
256fs or 384fs clock for
multimedia master
clock/IEC 958 clock or
divided system clock for
CD-DSP
I2S-bus bit clock
WS2
SDO2
IECO
I2S-bus left/right strobe
I2S-bus data to DAC/video
decoder
IEC 958 output
COMMENT
Clock reference input pin when interface is in a master mode; a
programmable divider is provided. This pin is also configurable as a
programmable clock output intended as a clock reference for a
CD-DSP. Should be pulled up if not in use.
This is used for master and slave I2S-bus application as both modes
are needed. For instance, the Philips multimedia CODEC is an I2S-bus
slave, hence this must be a master interface. When driving some
DACs, this interface can be a slave.
word select strobe either master or slave
I2S-bus multimedia data
the IEC 958 output combines multimedia data and Q-W subcode
Table 3 I2S-bus connections to CD engine (6 pins)
SYMBOL
SCKI1
WSI1
SDI1
C2P0
CFLG
DESCRIPTION
I2S-bus bit clock
I2S-bus left/right strobe
I2S-bus data from CD-DSP
CD C2 error corrector flag
from ERCO
CD error corrector flags and
absolute time sync
COMMENT
this is a separate clock to the multimedia bit clock as this rate is
derived from the disc linear velocity
these flags are used to indicate errors from second layer correction to
the ERCO
The absolute time sync is used in the CD input process for playing
‘Red Book’ discs; the error corrector status is also read in from this
signal, to provide an indication of C1 and C2 performance for CD-RW
applications.
1997 Aug 12
12
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