Cirrus Logic CS4271 - Manual (Page 38)

CS4271
38 DS592F1
8. REGISTER DESCRIPTION
** All registers are read/write in I²C mode and write only in SPI mode, unless otherwise noted**
8.1 Mode Control 1 - Address 01h
8.1.1 Functional Mode (Bits 7:6)
Function:
Selects the required range of input sample rates.
8.1.2 Ratio Select (Bits 5:4)
Function:
These bits are used to select the clocking ratios in Control Port Mode. Please refer to Table 8, “Clock
Ratios - Control Port Mode With External Crystal,” on page 28 or Table 9, “Clock Ratios - Control Port
Mode Without External Crystal,” on page 29 for information on which of these bits to set to obtain spe-
cific clock ratios.
8.1.3 Master / Slave Mode (Bit 3)
Function:
This bit selects either master or slave operation. Setting this bit will select master mode, while clearing
this bit will select slave mode.
8.1.4 DAC Digital Interface Format (Bits 2:0)
Function:
The required relationship between LRCK, SCLK and SDIN for the DAC is defined by the DAC Digital
Interface Format and the options are detailed in Table 12 and Figures 3-5.
7 6 5 4 3 2 1 0
M1 M0 Ratio1 Ratio0 M/S DAC_DIF2 DAC_DIF1 DAC_DIF0
Table 11. Functional Mode Selection
M1 M0 Mode
0 0 Single-Speed Mode: 4 to 50 kHz sample rates (default)
0 1 Single-Speed Mode: 4 to 50 kHz sample rates
1 0 Double-Speed Mode: 50 to 100 kHz sample rates
1 1 Quad-Speed Mode: 100 to 200 kHz sample rates
Table 12. DAC Digital Interface Formats
DAC_DIF2 DAC_DIF1 DAC_DIF0 Description Format Figure
0 0 0 Left Justified, up to 24-bit data (default) 0 3
0 0 1
I
2
S, up to 24-bit data
1 4
0 1 0 Right Justified, 16-bit Data 2 5
0 1 1 Right Justified, 24-bit Data 3 5
1 0 0 Right Justified, 20-bit Data 4 5
1 0 1 Right Justified, 18-bit Data 5 5
1 1 0 Reserved
1 1 1 Reserved