CS4297 Datasheet, PDF (27/46 Pages) Cirrus Logic – CrystalClear SoundFusion Audio Codec 97

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.
REF
ANL
DAC
ADC
Bit Name
Function
Vref at nominal levels
Analog Mixers, Mux, and Vol-
ume Controls ready
DAC ready to accept data
ADC ready to transmit data
Table 6. Codec Powerdown Status Bits
Bit Name
PR0
PR1
PR2
PR3
PR4
PR5
PR6
Function
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
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