CS4299 datasheet(14/52 Pages) CIRRUS

14 / 52 page

CS4299

3.1

AC-Link Serial Data Output Frame

In the serial data output frame, data is passed on the SDATA_OUT pin to the CS4299 from the AC ’97

controller. Figure 9 illustrates the serial port timing.

The PCM playback data being passed to the CS4299 is shifted out MSB first in the most significant bits

of each slot. Any PCM data from the AC ’97 controller that is not 20 bits wide should be left justified in

its corresponding slot and dithered or zero-padded in the unused bit positions.

Bits that are reserved should always be ‘cleared’ by the AC ’97 controller.

3.1.1

Serial Data Output Slot Tags (Slot 0)

Valid Frame

The Valid Frame bit determines if any of the following slots contain either valid playback data

for the CS4299 DACs or data for read/write operations. When ‘set’, at least one of the other

AC-link slots contain valid data. If this bit is ‘clear’, the remainder of the frame is ignored.

Slot [1:2] Valid

The Slot [1:2] Valid bits indicate the validity of data in their corresponding serial data output

slots. If a bit is ‘set’, the corresponding output slot contains valid data. If a bit is ‘cleared’, the

corresponding slot will be ignored.

Slot [3:10] Valid

The Slot [3:10] Valid bits indicate Slot [3:10] contains valid playback data for the CS4299. If a

Slot Valid bit is ‘set’, the named slot contains valid audio data. If the bit is ‘clear’, the slot will be

ignored. The CS4299 supports alternate slot mapping as defined in the AC ’97 2.1 specification.

For more information, see the AC Mode Control Register (Index 5Eh).

Codec ID[1:0]

The Codec ID[1:0] bits display the Codec ID of the audio codec being accessed during the cur-

rent AC-link frame. Codec ID[1:0] = 00 indicates the primary codec is being accessed. Codec

ID[1:0] = 01, 10, or 11 indicates one of three possible secondary codecs is being accessed. A

non-zero value of one or more of the Codec ID bits indicates a valid Read or Write Address in

Slot 1, and the Slot 1 R/W bit indicates presence or absence of valid Data in Slot 2.

Bit 15

543210

Valid

Frame

Slot 1

Valid

Slot 2

Valid

Slot 3

Valid

Slot 4

Valid

Slot 5

Valid

Slot 6

Valid

Slot 7

Valid

Slot 8

Valid

Slot 9

Valid

Slot 10

Valid

Reserved

Codec

ID1

Codec

ID0

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