WM9704CFTSLASHV datasheet(20/37 Pages) WOLFSON

20 / 37 page

WM9704M

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WOLFSON MICROELECTRONICS LTD

PD Rev 3.2 January 2001

COMMAND ADDRESS PORT BIT ASSIGNMENTS

Bit (19)

Read/write command (1 = read, 0 = write)

Bit (18:12)

Control register index (64 16-bit locations, addressed on even

byte boundaries)

Bit (11:0)

Reserved (stuffed with 0s)

The first bit (MSB) sampled by the WM9704M indicates whether the current control transaction is a

read or write operation. The following 7 bit positions communicate the targeted control register

address. The trailing 12 bit positions within the slot are reserved and must be stuffed with 0s by the

AC’97 controller.

SLOT 2: COMMAND DATA PORT

The command data port is used to deliver 16-bit control register write data in the event that the

current command port operation is a write cycle. (As indicated by slot 1, bit 19).

Bit (19:4)

Control register write data (stuffed with 0s if current operation is

a read)

Bit (3:0)

Reserved (stuffed with 0s)

If the current command port operation is a read then the entire time slot must be stuffed with 0s by

the AC’97 controller.

SLOT 3: PCM PLAYBACK LEFT CHANNEL

Audio output frame slot 3 is the composite digital audio left playback stream. In a typical ‘Games

Compatible’ PC this slot is composed of standard PCM (.wav) output samples digitally mixed (on the

AC’97 controller or host processor) with music synthesis output samples. If a sample stream of

resolution less than 20-bits is transferred, the AC’97 controller must stuff all trailing non-valid bit

positions within this time slot with 0s.

SLOT 4: PCM PLAYBACK RIGHT CHANNEL

Audio output frame slot 4 is the composite digital audio right playback stream. In a typical ‘Games

Compatible’ PC this slot is composed of standard PCM (.wav) output samples digitally mixed (on the

AC’97 controller or host processor) with music synthesis output samples.

If a sample stream of resolution less than 20-bits is transferred, the AC’97 controller must stuff all

trailing non-valid bit positions within this time slot with 0s.

SLOT 5: OPTIONAL MODEM LINE 1 CODEC

Audio output frame slot 5 contains the MSB justified modem line1 DAC input data. This optional

AC’97 feature is supported in WM9704M, but only in the modem operation mode (selected with the

mode0/1 pins). If data is written to this location it is applied to the rear channel DACs if the modem

mode is enabled. This may be determined by the AC’97 controller interrogating the WM9704M

Vendor ID registers; if modem mode is disabled, the device appears not to support modem. If the

mode is enabled, the modem support flag is set.

SLOTS 6 TO 9: SURROUND SOUND DATA

Audio output frame slots 6 to 9 are used to send surround sound data to extra DAC channels. These

slots are supported by WM9704M in Revision 2.1 and modem modes. Note that the data in the

surround sound slots will only be applied to the front DAC. The slots used depend on the Codec ID

configuration (see Table 7).

SLOT 10: OPTIONAL MODEM LINE2 CODEC

Audio output frame slot 10 contains MSB justified modem Line2 DAC input data. This optional AC’97

feature is supported by WM9704M, but only when register 5Ah DLM (Dual line modem) is set.

SLOT 11: HANDSET DAC

Slot 11 is not supported.

WM9704CFT/V Datasheet(PDF) 20 Page - Wolfson Microelectronics plc

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