3 de-emphasis control (dem1:0) bits 3-2, 4 functional mode (fm1:0) bits 1-0, Figure 17. de-emphasis curve – Cirrus Logic CS4398 User Manual
Page 30: Table 6. digital interface formats - dsd mode, Cs4398
30
DS568F1
CS4398
DSD Mode: The relationship between the oversampling ratio of the DSD audio data and the required
Master Clock to DSD data rate is defined by the Digital Interface Format pins.
7.2.3
De-emphasis Control (DEM1:0) BITs 3-2
.
Default = 0
00 - No De-emphasis
01 - 44.1 kHz De-emphasis
10 - 48 kHz De-emphasis
11 - 32 kHz De-emphasis
Function:
Selects the appropriate digital filter to maintain the stan-
dard 15
µs/50 µs digital de-emphasis filter response at 32,
44.1 or 48 kHz sample rates. (see Figure 17)
Notes: De-emphasis is only available in Single-Speed
Mode.
7.2.4
Functional Mode (FM1:0) BITs 1-0
Default = 00
00 - Single-Speed Mode (30 to 50 kHz sample rates)
01 - Double-Speed Mode (50 to 100 kHz sample rates)
10 - Quad-Speed Mode (100 to 200 kHz sample rates)
11 - Direct Stream Digital Mode
Function:
Selects the required range of input sample rates or DSD Mode.
7.3
Volume Mixing and Inversion Control - Register 03h
DIF2
DIF1
DIF0
Description
0
0
0
64x oversampled DSD data with a 4x MCLK to DSD data rate (Default)
0
0
1
64x oversampled DSD data with a 6x MCLK to DSD data rate
0
1
0
64x oversampled DSD data with a 8x MCLK to DSD data rate
0
1
1
64x oversampled DSD data with a 12x MCLK to DSD data rate
1
0
0
128x oversampled DSD data with a 2x MCLK to DSD data rate
1
0
1
128x oversampled DSD data with a 3x MCLK to DSD data rate
1
1
0
128x oversampled DSD data with a 4x MCLK to DSD data rate
1
1
1
128x oversampled DSD data with a 6x MCLK to DSD data rate
Table 6. Digital Interface Formats - DSD Mode
7
6
5
4
3
2
1
0
VOLB=A
INVERT A
INVERT B
ATAPI4
ATAPI3
ATAPI2
ATAPI1
ATAPI0
0
0
0
0
1
0
0
1
Gain
dB
-10dB
0dB
Frequency
T2 = 15 µs
T1=50 µs
F1
F2
3.183 kHz
10.61 kHz
Figure 17. De-Emphasis Curve