Cirrus Logic CS4385 - Manual (Page 45)

DS671F2 45
CS4385
6.10 Mixing Control (address 0Ah, 0Dh, 10h, 13h)
6.10.1 De-Emphasis Control (PX_DEM1:0)
Default = 00
00 - Disabled
01 - 44.1 kHz
10 - 48 kHz
11 - 32 kHz
Function:
Selects the appropriate digital filter to maintain the standard 15
μs/50 μs digital de-emphasis filter re-
sponse at 32, 44.1 or 48 kHz sample rates. (see Figure 20 )
De-emphasis is only available in Single-Speed Mode.
6.10.2 ATAPI Channel Mixing and Muting (ATAPI)
Default = 01001 - AOUTAx=aL, AOUTBx=bR (Stereo)
Function:
The CS4385 implements the channel-mixing functions of the ATAPI CD-ROM specification. The ATAPI
functions are applied per A-B pair. Refer to
Table 9 and Figure 21 for additional information.
7 6 5 4 3 2 1 0
Reserved Px_DEM1 Px_DEM0 PxATAPI4 PxATAPI3 PxATAPI2 PxATAPI1 PxATAPI0
0 0 0 0 1 0 0 1
ATAPI4 ATAPI3 ATAPI2 ATAPI1 ATAPI0 AOUTAx AOUTBx
0 0 0 0 0 MUTE MUTE
0 0 0 0 1 MUTE bR
0 0 0 1 0 MUTE bL
0 0 0 1 1 MUTE b[(L+R)/2]
0 0 1 0 0 aR MUTE
0 0 1 0 1 aR bR
0 0 1 1 0 aR bL
0 0 1 1 1 aR b[(L+R)/2]
0 1 0 0 0 aL MUTE
0 1 0 0 1 aL bR
0 1 0 1 0 aL bL
0 1 0 1 1 aL b[(L+R)/2]
0 1 1 0 0 a[(L+R)/2] MUTE
0 1 1 0 1 a[(L+R)/2] bR
0 1 1 1 0 a[(L+R)/2] bL
0 1 1 1 1 a[(L+R)/2] b[(L+R)/2]
1 0 0 0 0 MUTE MUTE
1 0 0 0 1 MUTE bR
1 0 0 1 0 MUTE bL
Table 9. ATAPI Decode Table