TMPR4937 datasheet(409/552 Pages) TOSHIBA

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Chapter 14 AC-link Controller

14-3

14.3 Functional Description

ACLC provides four mechanisms to operate AC’97-compliant CODEC(s):

•

AC-link status control (start-up and low-power mode)

•

CODEC register access

•

Sample-data transmission and reception

•

GPIO operation

This section first describes the CODEC connection, chip configuration, and overall usage-flow. Then AC-

link start-up sequence and the other mechanisms will be described. Using low-power mode comes last.

14.3.1 CODEC Connection

The ACLC module has two SDIN (named as SDATA_IN in the AC’97 specification) signals and

supports up to two CODECs to be connected. This section shows some system configuration diagrams

for typical usages. Note that the diagrams shown here is intended to provide conceptual understanding

and some components may be necessary on the actual circuit board to ensure proper electrical signals.

The diagrams assume CODECs compliant with the CODEC ID strapping recommendation described in

the section D.5.2 of the AC’97 revision 2.1 specification.

14.3.1.1 Stereo Audio and Optional Modem Connection

Figure 14.3.1 Stereo Audio and Optional Modem Connection Diagram

SDIN1

ACRESET*

BITCLK

SYNC

SDOUT

SDIN0

ACLC

CID0

RESET#

BIT_CLK

SYNC

SDATA_OUT

SDATA_IN

Audio CODEC (CODEC ID=‘00’)

CID1

CID0

RESET#

BIT_CLK

SYNC

SDATA_OUT

SDATA_IN

Optional Modem CODEC (CODEC ID=’01’)

CID1

GND

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