LM4549B datasheet(21/28 Pages) NSC

Part #	LM4549B

Description	AC ??7 Rev 2.1 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound

PDF	28 Pages

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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21 / 28 page

AC Link Serial Interface Protocol

(Continued)

SLOT 3, INPUT FRAME (Continued)

Bits

Description

Comment

1:0

Reserved

Stuffed with "0"s by LM4549B

SDATA_IN: Slot 4 – PCM Record Right Channel

This slot contains sampled data from the right channel of the

stereo ADC. The signal to be digitized is selected using the

Record Select register (1Ah) and subsequently routed

through the Record Select Mux and the Record Gain ampli-

fier to the ADC.

This is a 20-bit slot and the digitized 18-bit PCM data is

transmitted in an MSB justified format. The remaining 2

LSBs are stuffed with zeros.

SLOT 4, INPUT FRAME

Bits

Description

Comment

19:2

PCM Record

Right Channel

data

18-bit PCM sample from right

ADC

1:0

Reserved

Stuffed with "0"s by LM4549B

SDATA_IN: Slots 5 to 12 – Reserved

Slots 5 – 12 of the AC Link Input Frame are not used for data

by the LM4549B and are always stuffed with zeros.

LM4549B Datasheet(PDF) 21 Page - National Semiconductor (TI)