Pre-Production
WM8850
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
14h
15h
16h
17h
OVERWRITE CONTROL VERB (VENDOR-SPECIFIC)
Verb ID
Payload [7:0]
00h
Response[31:0]
Get
Set
F93h
793h
Bits [31:0] in the table below
00000000h
Bits [7:0] in the table below
Bit
Bitfield Name
Rsvd
RW
R
Default
0000000h
1
Description
[31:3]
[2]
Reserved
NA_CNTRL
RW
Controls the conditions under which the non audio flag is asserted:
0 = non-audio flag asserted when the non-audio code (defined in IEC-
61937) is detected. Non-audio flag rescinds after 4096 S/PDIF frames
without non-audio code being present.
1 = as above, but Channel Status Bit [1] (/AUDIO) must also be set to 1
for the non-audio flag to assert. Non-audio flag rescinds in the same way
as above, and in addition the flag will rescind immediately if /AUDIO were
to go low.
[1]
NA_OVWR_EN
RW
0
If a Non-Audio Flag is asserted then sample data is overwritten with zeros
when this bit is set:
0 = no overwrite
1 = overwrite samples with zeros
Note: When in Software Formatted S/PDIF Mode, only the 24-bit payload
can be overwritten.
Note: When SRC1 is used (i.e. Processing State is 01h), NA_OVWR_EN
is set to 1 by the WM8850
[0]
DE_OVWR_EN
RW
1
If a DATA_ERR is detected, the sample is overwritten with zeros when
this bit is set:
0 = Let erroneous sample pass
1 = overwrite erroneous sample with zeros
Note: When in Software Formatted S/PDIF Mode, all 32-bits of the
stream sample are overwritten.
PP, April 2011, Rev 3.2
119
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
