CS5535 datasheet(240/555 Pages) NSC

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ACC Register Descriptions (Continued)

PD_PRIM

Power-down Semaphore for Primary Codec. This bit is used by software in conjunc-

tion with bit 20 to coordinate the power-down of the two codecs. This bit is intended to

be set by the audio driver to indicate to the modem driver that the audio codec has

been prepared for power-down. Internally it does not control anything, and is simply a

memory bit.

PD_SEC

Power-down Semaphore for Secondary Codec. This bit is used by software in con-

junction with bit 21 to coordinate the power-down of the two codecs. This bit is intended

to be set by the modem driver to indicate to the audio driver that the modem codec has

been prepared for power-down. Internally it does not control anything, and is simply a

memory bit.

RSVD

Reserved. Reads return 0.

LNK_SHTDWN

AC Link Shutdown. Informs the Controller that the AC Link is being shutdown.

This bit should be set at the same time that the codec power-down command is issued

to the codec.

Setting this bit also clears both Codec Ready bits in the Codec Status register (ACC I/O

Offset 08h[23:22]).

Issuing a warm reset via bit 17 clears this bit.

If the codec has been powered off and back on, a warm reset is unnecessary, this bit

should be cleared manually.

LNK_WRM_RST

AC Link Warm Reset. Setting this bit initiates the AC Link/codec warm reset process.

It is automatically cleared by hardware once the serial bit clock resumes. This should

only be set when the codec(s) are powered down. Once set, software should then wait

for "Codec Ready" before accessing the codec.

CMD_NEW

Codec Command New. Indicates if the codec command in bits [31:22] (and [15:0] for

writes) is new.

0: Not new.

1: New.

This bit is to be set by software when a new command is loaded. It is cleared by hard-

ware when the command is sent to the codec. Software must wait for this bit to clear

before loading another command.

This bit can not be cleared by software. When the CODEC_CNTL register is written by

software with bit 16 cleared, then bits [31:22] and [15:0] are unaffected. Thus, bit 16 is

an "enable" allowing bits [31:22] and [15:0] to be changed.

15:0

CMD_DATA

Codec Command Data. This is the command data being sent to the codec in slot 2,

bits [19:12] of the serial output stream. This is used for writing data into one of the reg-

isters in the AC97 codec. The contents are only sent to the codec for write commands

(bit [31] = 0). For reads slot 2, bits[19:12] are stuffed with 0s.

ACC_CODEC_CNTL Bit Descriptions (Continued)

Bit

Name

Description

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