CS4299 datasheet(29/52 Pages) CIRRUS

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CS4299

4.16

PCM Front DAC Rate Register (Index 2Ch)

SR[15:0]

Front DAC Sample Rate. The SR[15:0] bits can only be written when the VRA bit of the Extend-

ed Audio Status/Control Register (Index 2Ah) is ‘set’. If the VRA bit is ‘clear’, all writes are ig-

nored and the register reads back BB80h; corresponding to a 48 kHz sample rate. If the VRA

bit is ‘set’, seven standard sample rates are available. If a sample rate written to the register is

not directly supported, the attempted value to be written will be decoded according to the ranges

indicated in Table 7. All register read transactions will reflect the actual value stored (column 2

in Table 7) and not the one attempted to be written.

Default

BB80h. This value corresponds to 48 kHz sample rate..

4.17

PCM L/R ADC Rate Register (Index 32h)

SR[15:0]

Left/Right ADC Sample Rate. The SR[15:0] bits can only be written when the VRA bit of the

Extended Audio Status/Control Register (Index 2Ah) is ‘set’. If the VRA bit is ‘clear’, all writes

are ignored and the register reads back BB80h; corresponding to a 48 kHz sample rate. If the

VRA bit is ‘set’, seven standard sample rates are available. If a sample rate written to the reg-

ister is not directly supported, the attempted value to be written will be decoded according to

the ranges indicated in Table 7. All register read transactions will reflect the actual value stored

(column 2 in Table 7) and not the one attempted to be written.

Default

BB80h. This value corresponds to 48 kHz sample rate.

D15

D14

D13

D12

D11

D10

SR15

SR14

SR13

SR12

SR11

SR10

SR9

SR8

SR7

SR6

SR5

SR4

SR3

SR2

SR1

SR0

Sample rate

(Hz)

SR[15:0]

SR[15:12]

Decode Range

8,000

1F40

0 or 1

11,025

2B11

16,000

3E80

22,050

5622

4 or 5

32,000

7D00

6 or 7

44,100

AC44

8, 9, or Ah

48,000

BB80

Bh, Ch, Dh, Eh, or Fh

Table 7. Standard Sample Rates

D15

D14

D13

D12

D11

D10

SR15

SR14

SR13

SR12

SR11

SR10

SR9

SR8

SR7

SR6

SR5

SR4

SR3

SR2

SR1

SR0

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