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CS4207-CNZ Datasheet, PDF (77/148 Pages) Cirrus Logic – Low-power, 4-in / 6-out HD Audio Codec with Headphone Amp | |||
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CS4207
Bits
Type
Default
Description
VCFG (Validity Config.): Determines S/PDIF
transmitter behavior when data is not being
transmitted. When asserted, this bit forces the
de-assertion of the S/PDIF âValidityâ flag, which
is bit 28 transmitted in each S/PDIF subframe.
This bit is only defined for Output Converters and
is defined as Reserved, with a Read Only value
of 0 for Input Converters.
ï´ If âVâ = 0 and âVCFGâ=0, then for each
S/PDIF subframe (Left and Right) bit[28]
âValidityâ flag reflects whether or not an
internal codec error has occurred (specifically
whether the S/PDIF interface received and
transmitted a valid sample from the High
Definition Audio Link). If a valid sample (Left
or Right) was received and successfully
transmitted, the âValidityâ flag should be 0 for
that subframe. Otherwise, the âValidityâ flag
for that subframe should be transmitted as
â1.â
ï´ If âVâ = 0 and âVCFGâ = 1, then for each
2
Read/Write
0b
S/PDIF subframe (Left and Right), bit[28]
âValidityâ flag reflects whether or not an
internal codec transmission error has
occurred. Specifically, an internal codec error
should result in the âValidityâ flag being set to
1. In the case where the S/PDIF transmitter is
not receiving a sample or does not receive a
valid sample from the High Definition Audio
Controller (Left or Right), the S/PDIF
transmitter should set the S/PDIF âValidityâ
flag to 0 and pad each of the S/PDIF âAudio
Sample Wordâ in question with 0âs for the
subframe in question. If a valid sample (Left
or Right) was received and successfully
transmitted, the âValidityâ flag should be 0 for
that subframe.
ï´ If âVâ = 1 and âVCFGâ = 0, then each S/PDIF
subframe (Left and Right) should have bit[28]
âValidityâ flag = 1. This tags all S/PDIF
subframes as invalid.
ï´ âVâ = 1 and âVCFGâ = 1 state is reserved for
future use.
ï´ Default state, coming out of reset, for âVâ and
âVCFGâ should be 0 and 0 respectively.
V (Validity): This bit affects the âValidity flag,â
bit[28] transmitted in each subframe, and
enables the S/PDIF transmitter to maintain con-
1
Read/Write
0b
nection during error or mute conditions. The
behavior of the S/PDIF transmitter with respect
to this bit depends on the value of the âVCFGâ
bit.
DigEn (Digital Enable): Enables or disables digi-
tal transmission. A 1 indicates that the digital
0
Read/Write
0b
data can pass through the node. A 0 indicates
that the digital data is blocked from passing
through the node, regardless of the state.
DS880F4
77
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