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SAA7385 Datasheet(PDF) 51 Page - NXP Semiconductors

Part No. SAA7385
Description  Error correction and host interface IC for CD-ROM SEQUOIA
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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SAA7385 Datasheet(HTML) 51 Page - NXP Semiconductors

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1996 Jun 19
51
Philips Semiconductors
Preliminary specification
Error correction and host interface IC for
CD-ROM (SEQUOIA)
SAA7385
15.5
S2B interface timing
The S2B serial interface consists of four lines (see Fig.17):
Transmit data (TXD)
Receive data (RXD)
Data path ready to accept data; active LOW (CPR)
Basic engine ready to accept data; active LOW (SPR).
These are used for communication. TXD and CPR for
sending acknowledges and information data to the data
path and RXD and SPR for receiving commands and
parameters from the data path. The data is transferred
frame-wise and asynchronously.
A data frame is proceeded by a start-bit (active LOW),
followed by the actual data byte, and again followed by a
parity bit (even parity), and a stop bit (active HIGH),
see Fig.18. In total, eleven bits per frame are incorporated.
The interface is full duplex, meaning data frames may be
transmitted and received simultaneously.
The bit-rate is selectable:
187.5 kbits/s with a 2.6% error
62.5 kbits/s with a 0.4% error
31.25 kbits/s with a 0.4% error.
Fig.17 S2B interface.
handbook, halfpage
MGE403
RXD
data path
sequoia
basic engine
CPR
TXD
SPR
TXD
CPR
RXD
SPR
Fig.18 S2B Timing.
handbook, halfpage
MGE404
S0
TXD
01234567
P
S1
CPR


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