STAC9750 Datasheet, PDF (50/73 Pages) Integrated Device Technology – VALUE-LINE TWO-CHANNEL AC’97 CODECS

STAC9750/9751
VALUE-LINE TWO-CHANNEL AC’97 CODECS
PC AUDIO
Table 34. GPIO Pin Status Register
Bit(s)
15:2
Access
Read Only
Reset Value Name
Description
0
Reserved Bit not used, should read back 0
When GPIO1 is configured as output and Register 74h bit[0] = 0
(default), the value of this register will be placed on the GPIO1 pad.
When GPIO1 is configured as output and Register 74h bit[0] =1, the
GPIO1 pad will get its value from slot12.
1 Read / Write
x
GI1 _{When GPIO1 is configured as input and configured as a sticky writing}
a 1 does nothing, writing a 0 clears this bit.
When GPIO1 is configured as input this register reflects the value on
the GPIO1 pad after interpretation of the polarity and sticky
configurations.
When GPIO0 is configured as output and Register 74h bit[0] = 0
(default), the value of this register will be placed on the GPIO0 pad.
When GPIO0 is configured as output and Register 74h bit[0] =1, the
GPIO0 pad will get its value from slot12.
0 Read / Write
x
GI0 _{When GPIO0 is configured as input and configured as a sticky writing}
a 1 does nothing, writing a 0 clears this bit.
When GPIO0 is configured as input this register reflects the value on
the GPIO0 pad after interpretation of the polarity and sticky
configurations.
6.5.23.
Digital Audio Control (6Ah)
Default: 0000h
D15
D14
D7
D6
Bit(s)
15:2
Reset
0
1
0
0
0
D13
D12
D11
D10
D9
Reserved
D5
D4
D3
D2
D1
Reserved
DO1
Table 35. Digital Audio Control Register
Name
Reserved
DO1
DO0
Description
Bits not used, should read back 0
SPDIF Digital Output Source Selection:
DO1 = 0; PCM data from the AC-Link to SPDIF
DO1 = 1; ADC record data to SPDIF
Always reads zero
D8
D0
DO0
This read/write register is used to program the digital mixer input status. In the default state, the PCM
DAC path is enabled and the ADC record inputs are disabled.
The DO1 and DO0 bits control the input source for the PCM to digital output converters. The table
describes the available options.
IDT™
VALUE-LINE TWO-CHANNEL AC’97 CODECS
50
STAC9750/9751
V 5.8 103106