CS4297
CrystalClear™ SoundFusion™ Audio Codec ’97
Powerdown Control/Status Register (Index 26h)
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
PR6
PR5
PR4
PR3
PR2
PR1
PR0
0
0
0
0
REF
ANL DAC ADC
The bits in this register correspond to the AC’97 defined powerdown and status functions. See the follow-
ing tables for the definitions of the individual bits which the CS4297 supports.
Bit Name
Function
REF
ANL
Vref at nominal levels
Analog Mixers, Mux, and Vol-
ume Controls ready
DAC
ADC
DAC ready to accept data
ADC ready to transmit data
Table 6. Codec Powerdown Status Bits
Bit Name
Function
PR0
PR1
PR2
PR3
PR4
PR5
PR6
ADCs and Input Mux Powerdown
DACs Powerdown
Analog Mixer Powerdown (Vref still on)
Analog Mixer Powerdown (Vref off)
AC-Link Powerdown (BIT_CLK off)
Internal Clock Disable
Alternate Line Output Buffer Powerdown
Table 7. Codec Powerdown Control Bits
Reserved Registers (Index 28h - 58h)
These registers are reserved for future use by the AC’97 specification. The CS4297 ignores writes to these
registers.
Crystal Revision and Fab ID Register (Index 5Ah)
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
1
This vendor reserved register is being used by the CS4297 to indicate the revision level of the CS4297 as
well as the Fab ID where the part was manufactured. This is in addition to the Vendor ID registers located
below. The revision level is indicated in bits D11:8 and will be 03h for the release revision of the chip.
The Fab ID is indicated in bits D3:0 and will be 01h.
DS242F5
27
CIRRUS [ CIRRUS LOGIC ]
