25. Audio Codec Interface (HAC)
Rev.1.00 Jan. 10, 2008 Page 1286 of 1658
REJ09B0261-0100
25.4 AC 97 Frame Slot Structure

Figure 25.2 shows the AC97 frame slot structure. This LSI supports slots 0 to 4 only. Slots 5 to 12

(hatched area) are out of scope.

Slot No.
TAG CMD
Data
CMD
Addr
PCML
Front
LINE1
DAC
PCMR
Front
PCM
Center
PCMR
Surr
PCML
Surr
PCM
LFE
HSET
DAC
IO
CTRL
LINE2
DAC
0123456789101112
HAC_SYNC
HAC_SDOUT (transmit)
HAC_SDIN (receive) TAG Status
Data
Status
Addr
PCM
Left
LINE1
ADC
PCM
Right
PCM
MIC
Reser
ved
Reser
ved
Reser
ved
HSET
ADC
IO
Status
LINE2
ADC

Figure 25.2 AC97 Frame Slot Structure

Table 25.3 AC97 Transmit Frame Structure

Slot Name Description
0 SDATA_OUT TAG Codec IDs and Tags indicating valid data
1 Control CMD Addr write port Read/write command and register address
2 Control DATA write port Register write data
3 PCM L DAC playback Left channel PCM output data
4 PCM R DAC playback Right channel PCM output data
5 Modem Line 1 DAC Modem 1 output data (unsupported)*
6 PCM Center Center channel PCM data (unsupported)*
7 PCM Surround L Surround left channel PCM data (unsupported)*
8 PCM Surround R Surround right channel PCM data (unsupported)*
9 PCM LFE LFE channel PCM data (unsupported)*
10 Modem Line 2 DAC Modem 2 output data (unsupported)*
11 Modem handset DAC Modem handset output data (unsupported)*
12 Modem IO control Modem control IO output (unsupported)*
Note: * There is no register for unsupported functions.