cs4297 Cirrus Logic, Inc., cs4297 Datasheet - Page 27

• Manufacturer Part Number: cs4297
• Description: Crystalclear Soundfusion Audio Codec 97 Logic
• Manufacturer: Cirrus Logic, Inc.

DS242F5
Powerdown Control/Status Register (Index 26h)
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.
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)
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.
CS4297
CrystalClear™ SoundFusion™ Audio Codec ’97
D15
D15
0
0
PR6
D14
D14
0
PR5
D13
D13
0
PR4
D12
D12
0
PR0
PR1
PR2
PR3
PR4
PR5
PR6
REF
ANL
DAC
ADC
PR3
Bit Name
D11
D11
0
Bit Name
PR2
D10
D10
0
Table 7. Codec Powerdown Control Bits
Table 6. Codec Powerdown Status Bits
PR1
D9
D9
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
1
PR0
D8
D8
1
Vref at nominal levels
Analog Mixers, Mux, and Vol-
ume Controls ready
DAC ready to accept data
ADC ready to transmit data
D7
D7
0
0
Function
D6
D6
Function
0
0
D5
D5
0
0
D4
D4
0
0
REF
D3
D3
0
ANL
D2
D2
0
DAC
D1
D1
0
ADC
D0
D0
1
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