
1
Copyright
Cirrus Logic, Inc. 1997
(All Rights Reserved)
Cirrus Logic, Inc.
Crystal Semiconductor Products Division
P.O. Box 17847, Austin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.crystal.com
CS8401A
CS8402A
Digital Audio Interface Transmitter
Features
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Monolithic Digital Audio Interface Transmitter
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Supports: AES/EBU, IEC958, S/PDIF, &
EIAJ CP-340 Professional and Consumer
Formats
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Host Mode and Stand Alone Modes
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Generates CRC Codes and Parity Bits
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On-Chip RS422 Line Driver
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Configurable Buffer Memory (CS8401A)
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Transparent Mode Allows Direct Connection
of CS8402A and CS8412 or CS8401A and
CS8411A
Description
The CS8401/2A are monolithic CMOS devices which en-
code and transmit audio data according to the AES/EBU,
IEC958, S/PDIF, & EIAJ CP-340 interface standards.
The CS8401/2A accept audio and digital data, which is
then multiplexed, encoded and driven onto a cable. The
audio serial port is double buffered and capable of sup-
porting a wide variety of formats.
The CS8401A has a configurable internal buffer memo-
ry, loaded via a parallel port, which may be used to buffer
channel status, auxiliary data, and/or user data.
The CS8402A multiplexes the channel, user, and validity
data directly from serial input pins with dedicated input
pins for the most important channel status bits.
ORDERING INFORMATION
See page 30.
I
SCK
6
FSYNC
SDATA
7
8
MCK
5
TXP
20
TXN
17
Audio
Serial Port
CS
14
16
RD/WR
A4-A0
5
D7-D0
8
Configurable
Buffer
Memory
INT
15
MUX
Prescaler
RS422
Driver
SCK
6
FSYNC
SDATA
7
8
MCK
5
TXP
20
TXN
17
Audio
Serial Port
C
U
V
Registers
MUX
RS422
Driver
M2
23
M1
22
M0
21
7
Dedicated Channel
Status Bits
15
CBL
24
TRNPT
RST
16
10
11
9
CS8401A
CS8402A
NOV ‘93
DS60F1