wm9705seft-v Wolfson Microelectronics plc, wm9705seft-v Datasheet - Page 35

• Manufacturer Part Number: wm9705seft-v
• Description: Multimedia Ac?97 Codec With Integrated Touch Screen Controller
• Manufacturer: Wolfson Microelectronics plc

WM9705
REGISTER 2AH – EXTENDED AUDIO STATUS AND CONTROL REGISTER
REGISTER 2Ch AND 32h – AUDIO SAMPLE RATE CONTROL REGISTERS
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Table 16 Extended Audio ID Register
Table 17 DAC Slot Mapping
DAC slot mapping to slots 7 and 8 or slots 6 and 9 cannot be used in variable rate mode (VRA=1)
for sample rates other than 48kHz.
The Extended Audio Status and Control Register is a read/write register that provides status and
control of the extended audio features. Note that SPDIF slot mapping default varies according to
codec pin configuration. See Table 2.
Table 18 Extended Audio Status and Control Register
These registers are read/write registers that are written to, to select alternative sample rates for
the audio PCM converters. Default is the 48ks/s rate. Note that only Revision 2.2 recommended
rates are supported by the WM9705, selection of any other unsupported rates will cause the rate
to default to the nearest supported rate, and the supported rate value to be latched and so read
Table 19 SPDIF Slot Mapping
00
01
10
11
DATA BIT
SPSA0, SPSA1
DATA BIT
SPSA0
SPSA1
SPDIF
DSA1, DSA0
SPCV
VRA
SPDIF
CDAC
SDAC
AMAP
LDAC
DSA0
DSA1
REV0
REV1
DRA
VRM
VRA
ID0
ID1
00
01
10
11
FUNCTION
Enables variable rate audio mode
SPDIF transmitter enable
SPDIF slot assignment
SPDIF slot assignment
SPDIF validity bit
FUNCTION
Variable rate audio support
Double rate audio support
SPDIF transmitter supported
Variable rate Mic ADC support
DAC slot mapping control
DAC slot mapping control
Centre DAC support
Surround DAC support
LFE DAC support
Slot mapping support for Codec ID
Revision number
Revision number
Codec configuration – pin 45 value
Codec configuration – fixed in WM9705
Slots 3 and 4
Slots 7 and 8
Slots 6 and 9
Slots 10 and 11
Slots 3 and 4
Slots 7 and 8
Slots 6 and 9
Slots 10 and 11
DAC SLOT MAPPING
SPDIF SLOT MAPPING
READ/WRITE
Read/write
Read/write
Read/write
Read/write
Read
0 (Inverse of level at pin 45)
See table below
See table below
‘1’ = supported
VALUE
1
0
0
0
0
0
1
1
0
0
PD Rev 4.5 July 2008
Production Data
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