SAA7390GP Philips Semiconductors, SAA7390GP Datasheet - Page 56
SAA7390GP
Manufacturer Part Number
SAA7390GP
Description
High performance Compact Disc-Recordable CD-R controller
Manufacturer
Philips Semiconductors
Datasheet
1.SAA7390GP.pdf
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Philips Semiconductors
15.5
The S2B serial interface consists of four lines (see Fig.19):
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.
1996 Jul 02
Transmit data (TXD)
Receive data (RXD)
Data path ready to accept data; active LOW (CPR)
Basic engine ready to accept data; active LOW (SPR).
High performance Compact
Disc-Recordable (CD-R) controller
S2B interface timing
handbook, halfpage
handbook, halfpage
CPR
TXD
data path
sequoia
S0
Fig.19 S2B interface.
RXD
CPR
SPR
0
TXD
Fig.20 S2B Timing.
1
2
56
3
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.20. 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:
4
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.
5
TXD
CPR
RXD
SPR
basic engine
6
7
MGE403
P S1
MGE404
Preliminary specification
SAA7390
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