AD1981B Analog Devices, AD1981B Datasheet - Page 19

• Manufacturer Part Number: AD1981B
• Description: AD1981B AC'97 SoundMAX® Codec
• Manufacturer: Analog Devices

Codec ID
00
00
00
01
01
10
10
11
This read/write sample rate control register contains a 16-bit unsigned value, representing the rate of operation in Hz.
SR[15:0]
SR[15:0]
Register 3Ah is a read/write register that controls SPDIF functionality and manages bit fields propagated as channel status (or subframe in the V case). With the
exception of V, this register should be written to only when the SPDIF transmitter is disabled (SPDIF bit in Register 2Ah is “0”). This ensures that control and status
information start up correctly at the beginning of SPDIF transmission.
REV. A
This read/write sample rate control register contains 16-bit unsigned value, representing the rate of operation in Hz.
Reg
No. Name
2Ch PCM Front
Reg
No. Name
3Ah SPDIF
Reg
No. Name
32h PCM L/R
DAC Rate
Control
ADC Rate
Sample Rate. The sampling frequency range is from 7 kHz (1B58h) to 48 kHz (BB80h) in 1 Hz increments.
If “0” is written to VRA, the sample rate is reset to 48k.
Sample Rate. The sampling frequency range is from 7 kHz (1B58h) to 48 kHz (BB80h) in 1 Hz increments.
If “0” is written to VRA, the sample rate is reset to 48k.
D15
V
Function
2-Ch Primary w/SPDIF
4-Ch Primary w/SPDIF
6-Ch Primary w/SPDIF
+2-Ch Secondary w/SPDIF
+4-Ch Secondary w/SPDIF
+2-Ch Secondary w/SPDIF
+4-Ch Secondary w/SPDIF
+2-Ch Secondary w/SPDIF
D15
SRF15 SRF14 SRF13 SRF12 SRF11 SRF10 SRF9 SRF8 SRF7 SRF6 SRF5 SRF4 SRF3 SRF2 SRF1 SRF0 BB80h
D15
SRA15 SRA14 SRA13 SRA12 SRA11 SRA10 SRA9 SRA8 SRA7 SRA6 SRA5 SRA4 SRA3 SRA2 SRA1 SRA0 BB80h
D14
X
D14
D14
SPSR1
D13
D13
D13
AC ’97 2.2 AMAP Compliant Default SPDIF Slot Assignments
D12
SPSR0
D12
D12
PCM Front DAC Rate Register (Index 2Ch)
D11
D11
SPDIF Control Register (Index 3Ah)
D11
L
PCM ADC Rate Register (Index 32h)
SPSA = 00
3 and 4
3 and 4
3 and 4
3 and 4
3 and 4
3 and 4
3 and 4
3 and 4
D10
D10
CC6
D10
D9
D9
CC5 CC4 CC3
D9
–19–
D8
D8
D8
SPSA = 01
7 and 8 (default)
7 and 8
7 and 8
7 and 8
7 and 8
7 and 8
7 and 8
7 and 8
D7
D7
D7
D6
D6
CC2
D6
CC1
D5
D5
D5
SPSA = 10
6 and 9
6 and 9 (default)
6 and 9
6 and 9 (default)
6 and 9
6 and 9 (default)
6 and 9
6 and 9
D4
CC0 PRE COPY /AUD PRO 2000h
D4
D4
D3
D3
D3
D2
D2
D2
D1
D1
D1
SPSA = 11
10 and 11
10 and 11
10 and 11 (default)
10 and 11 (default)
10 and 11 (default)
10 and 11 (default)
AD1981B
D0
D0
D0
Default
Default
Default