CS4207-CNZ Datasheet, PDF (76/148 Pages) Cirrus Logic – Low-power, 4-in / 6-out HD Audio Codec with Headphone Amp

6.7.8
Digital Converter Control
Get Parameter Command Format:
Bits [31:28]
CAd = X
Bits [27:20]
S/P Tx 1 Node ID=08h
S/P Tx 2 Node ID=14h
Bits [19:8]
Verb ID = F0Dh/**
CS4207
Bits [7:0]
Payload = 00h
** Note: Address F0Eh is not supported.
Set Parameter Command Format:
Bits [31:28]
CAd = X
CAd = X
Bits [27:20]
S/P Tx 1 Node ID=08h
S/P Tx 2 Node ID=14h
S/P Tx 1 Node ID=08h
S/P Tx 2 Node ID=14h
Bits [19:8]
Verb ID = 70Dh
Verb ID = 70Eh
Bits [7:0]
Payload = xxh (SIC bits [7:0])
Payload = xxh (SIC bits [15:8])
Response Format:
The S/PDIF IEC Control (SIC) bits are supported in one of two ways. In the first case referred to as “Codec
Formatted SPDIF,” if a PCM bit stream of less than 32 bits is specified in the Converter Format control,
then the S/PDIF Control bits, including the “V,” “PRE,” “/AUDIO,” and other such bits are embedded in the
stream by the codec using the values (SIC bits) from the Digital Converter Control.
In the second case referred to as “Software Formatted (or Raw) SPDIF,” if a 32-bit stream is specified in
the Converter Format control, the S/PDIF IEC Control (SIC) bits are assumed to be embedded in the
stream by software, and the raw 32-bit stream is transferred on the link with no modification by the codec.
However, the codec must properly interpret the Sync Preamble bits of the stream and then send the ap-
propriately coded preamble. The IEC60958 specification, Section 4.3, “Preambles,” defines the pream-
bles and the coding to be used. Software will specify the “B,” “M,” or “W” (also known as “X,” “Y,” or “Z”)
preambles by encoding the last four bits of the preamble into the Sync Preamble section (bits 0-3) of the
frame. The codec must examine the bits specified and encode the proper preamble based on the previous
state. The previous state is to be maintained by the codec hardware.
Bits
31:16
15
14:8
7
6
5
4
3
Type
Read Only
Read Only
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Default
0000h
0b
0000000b
0b
0b
0b
0b
0b
Description
Reserved
Reserved
CC[6:0] (Category Code): Programmed accord-
ing to IEC standards, or as appropriate.
L (Generation Level): Programmed according to
IEC standards, or as appropriate.
PRO (Professional): 1 indicates Professional use
of channel status; 0 indicates Consumer.
/AUDIO (Non-Audio): 1 indicates data is non-
PCM format; 0 indicates data is PCM.
COPY (Copyright): 1 indicates copyright is
asserted; 0 indicates copyright is not asserted.
PRE (Pre-emphasis): 1 indicates filter pre-
emphasis is 50/15 µs; 0 pre-emphasis is none.
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DS880F4