lm4549a National Semiconductor Corporation, lm4549a Datasheet - Page 21

• Manufacturer Part Number: lm4549a
• Description: Ac ?97 Rev 2.1 Multi-channel Audio Codec With Sample Rate Conversion And National 3d Sound
• Manufacturer: National Semiconductor Corporation

AC Link Serial Interface Protocol
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.
(Continued)
21
SDATA_IN: Slots 5 to 12 – Reserved
Slots 5 – 12 of the AC Link Input Frame are not used for data
by the LM4549A and are always stuffed with zeros.
Bits
19:2
1:0
Right Channel
PCM Record
Description
Reserved
data
SLOT 4, INPUT FRAME
18-bit PCM sample from right
ADC
Stuffed with "0"s by LM4549A
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