ST18-AU1 STMICROELECTRONICS [STMicroelectronics], ST18-AU1 Datasheet - Page 44

• Manufacturer Part Number: ST18-AU1
• Description: SIX-CHANNEL DOLBY AC3/MPEG2 AUDIO DECODER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST18-AU1
10 IEC-958 TRANSMITTER
The IEC-958 transmitter accepts either the AC-3/MPEG bitstream or the decoded audio output
PCM data, and formats the input in accordance with the IEC-958 (S/PDIF) specification for
output via the SPDIFOUT pin.
For further information refer to the IEC-958 interface specification.
10.1 IEC-958 transmitter registers
CHANSTA1: Channel status register 1
Note: write only register.
CHANSTA2: Channel status register 2
Note: write only register.
44/87
Bit
0
1
2
3-5
6-7
8-14
15
Bit
0-7
8-11
12-13
14-15
Bit of C
0
1
2
3-5
6-7
8-14
Genera-
tion status
Bit of C
16-23
24-27
28-29
30-191
Function
Digital data
Copyright indication
000 (Reserved)
Mode 0
00 (Fixed)
Category code
1001100 for DVD (AC3/MPEG)
Function
00000000 (Fixed)
all 0, fixed
0
0
1
0
1
0
1
0100
0000
1100
00
Consumer mode, fixed
audio data, muted or pcm
compressed audio data
digital copy prohibited
digital copy permitted
original/commercially pre-recorded
no indication/1st generation or higher
Fs 48kHz
Fs 44.1kHz
Fs 32kHz
clock precision fixed