CS4297 datasheet(17/46 Pages) CIRRUS

17 / 46 page

DS242F5

CS4297

CrystalClear™ SoundFusion™ Audio Codec ’97

Slot 2: AC’97 Register Write Data

Slot 2 indicates the Register Data of the current frame’s register write access.The 20 bits of this slot are

defined as:

WD15 - WD0 - Bits 19-4 contain the 16-bit value to be written to the register. Bits 3-0 are ignored, but

should always be ‘cleared’. If the access is a read, this slot is ignored. The data in Slot 2 will only be valid

when the Slot Valid bit 13 of Slot 0 (F2) corresponding to Slot 2 is ‘set’.

NOTE: For any write to an AC’97 Register, the write is defined to be an ‘atomic’ access. This means that

when the slot valid bit for Slot 1 is ‘set’, the slot valid bit for Slot 2 should always be ‘set’ during the same

audio frame. No write access may be split across 2 frames.

Slot 3: Left Channel PCM Playback Data

Slot 3 contains the left channel data. The 20 bits of this slot are defined as:

LP17 - LP0 - This is the 18-bit PCM playback 2’s compliment data for the left channel DAC in the

CS4297. The PCM playback data will be taken from the most significant 18 of the 20 bits in the slot. The

least significant 2 bits will be ignored. Any PCM data from the AC’97 Controller that is not at least 18-

bits should be left justified in Slot 3 and dithered or zero-padded in the unused bit positions.

Slot 4: Right Channel PCM Playback Data

Slot 4 contains the right channel data. The 20 bits of this slot are defined as:

RP17 - RP0 - This is the 18-bit PCM playback 2’s compliment data for the right channel DAC in the

CS4297. The PCM playback data will be taken from the most significant 18 of the 20 bits in the slot. The

least significant 2 bits will be ignored. Any PCM data from the AC’97 Controller that is not at least 18-

bits should be left justified in Slot 4 and dithered or zero-padded in the unused bit positions.

F36

F37

F38

F39

F40

F41

F42

F43

F44

F45

F46

F47

F48

F49

F50

F51 F52 F53 F54 F55

Bit 19

987654

3210

WD15 WD14 WD13 WD12 WD11 WD10 WD9 WD8 WD7 WD6 WD5 WD4 WD3 WD2 WD1 WD0

Reserved

F56

F57

F58

F59

F60

F61

F62

F63

F64

F65

F66

F67

F68

F69

F70

F71

F72

F73

F74

F75

Bit 19

876

5432

LP17 LP16 LP15 LP14 LP13 LP12 LP11 LP10 LP9

LP8

LP7

LP6

LP5

LP4

LP3

LP2

LP1

LP0

Reserved

F76

F77

F78

F79

F80

F81

F82

F83

F84

F85

F86

F87

F88

F89

F90

F91

F92

F93

F94

F95

Bit 19

876

5432

RP17 RP16 RP15 RP14 RP13 RP12 RP11 RP10 RP9 RP8 RP7 RP6 RP5 RP4 RP3 RP2 RP1 RP0

Reserved

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