Cirrus-logic CS4385 Manuel d'utilisateur télécharger pdf (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.

76543210

Reserved Px_DEM1 Px_DEM0 PxATAPI4 PxATAPI3 PxATAPI2 PxATAPI1 PxATAPI0

00001001

ATAPI4 ATAPI3 ATAPI2 ATAPI1 ATAPI0 AOUTAx AOUTBx

00000 MUTE MUTE

00001 MUTE bR

00010 MUTE bL

0 0 0 1 1 MUTE b[(L+R)/2]

00100 aR MUTE

00101 aR bR

00110 aR bL

00111 aR b[(L+R)/2]

01000 aL MUTE

01001 aL bR

01010 aL bL

0 1 0 1 1 aL b[(L+R)/2]

01100 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]

10000 MUTE MUTE

10001 MUTE bR

10010 MUTE bL

Table 9. ATAPI Decode Table

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 54 55

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Cirrus-logic CS4385 Manuel d'utilisateur Page 45