CS4297-KQ Cirrus Logic, CS4297-KQ Datasheet - Page 28

• Manufacturer Part Number: CS4297-KQ
• Description: CrystalClear SoundFusion Audio Codec 97
• Manufacturer: Cirrus Logic

Vendor Reserved Registers (Index 5C - 7Ah)
These registers are reserved for future use by the Crystal as needed. The CS4297 ignores writes to these
registers, and read values from these registers will return 0000h.
Vendor ID1 (Index 7Ch)
Vendor ID2 (Index 7Eh)
The Vendor ID registers provide a means to determine the manufacturer of the AC’97 part within a system.
For the CS4297, the ID registers contain the ASCII code for the first 3 letters of Crystal (CRY). The final
byte of register ID2 is a Revision field for the part. In the case of the CS4297, the revision is 03h. Thus,
register ID1 contains the value 4352h, and register ID2 contains 5903h.
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D15
D15
0
0
D14
D14
1
1
D13
D13
0
0
D12
D12
0
1
D11
D11
0
1
Register #
D10
D10
0
0
7Ch
7Eh
Table 8. Vendor ID Register Values
D9
D9
1
0
D8
D8
0
1
D7
D7
CrystalClear™ SoundFusion™ Audio Codec ’97
0
0
Vendor ID Value
D6
D6
1
0
4352h
5903h
D5
D5
0
0
D4
D4
1
0
D3
D3
0
0
D2
D2
0
0
D1
D1
1
1
CS4297
DS242F5
D0
D0
0
1