YMF754-R datasheet(50/60 Pages) YAMAHA

50 / 60 page

YMF754

June 28, 1999

-50-

8. Multiple AC’97 & Multi-Channel

DS-1E allows connection with up to two AC’97s, and plays back up to 4-channel PCM data.

Therefore, the

following applications can be realized.

8-1. AC’97 Digital Docking

AC’97 digital docking can be realized by mounting the secondary AC’97 on the docking station side. Typical

example of digital docking connection between DS-1E and AC’97s is represented in the diagram below.

Primary AC'97

(AC'97 Rev2.1)

Secondary AC'97

DS-1E

PC Side

Docking Station Side

CMCLK

XTL_IN

BIT_CLK

SYNC

SDATA_OUT

SDATA_IN

RESET#

XTL_IN

BIT_CLK

SYNC

SDATA_OUT

RESET#

SDATA_IN

CBCLK

CSYNC

CSDO

CSDI0

RST#

GPIO2

DOCKEN#

CSDI1

DVDD

Isolation Buffer

When digital docking interface is made with the main side (PC side) powered on, but docking station side

powered off, it may be not desirable for the secondary AC’97 that each output signal from the AC-Link is

applied to the secondary AC’97 that remains in powered off state.

In order to avoid such a situation, it is

necessary to place an additional isolation buffer on the PC side (or docking station side).

8-2. 4-Channel Speaker System

4-channel speaker system can be realized by the connection of DS-1E with two 2-channel AC’97s as

described at “8-1. AC’97 Digital Docking” or using the AC’97 that includes 4-channel D/A converters.

Then, 4-channel PCM data can be played back at one time.

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