CS4205 Datasheet, PDF (46/80 Pages) Cirrus Logic – CrystalClear Audio Codec 97 with Portable Computing

CS4205
5.29 Special Feature Address Register (Index 6Ch)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0
0
0
0
0
0
0
0
0
0
0
0
A3 A2 A1 A0
A[3:0]
Special Feature Address. This register functions as an index register to select the desired
functionality of the Special Feature Data Register (Index 6Eh). Before using any of these in-
dexed registers, the correct index value must be written to bits A[3:0].
Default
0000h
5.30 Special Feature Data Register (Index 6Eh)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D[15:0]
Special Feature Data. This register is an indexed data port for the special feature registers
(Index 6E, Address 00h - 0Fh) which control advanced subsystems of the CS4205, such as
digital mixer settings, effects engine parameters, ZV Port control, and internal error condition
signaling. Before using any of these functions, the correct index value must be written to the
Special Feature Address Register (Index 6Ch).
Default
8000h
5.31 Digital Mixer Input Volume Registers (Index 6Eh, Address 00h - 05h)
D15 D14 D13 D12 D11 D10 D9 D8 D7
Mute 0 GL5 GL4 GL3 GL2 GL1 GL0 0
D6 D5 D4 D3 D2 D1 D0
0 GR5 GR4 GR3 GR2 GR1 GR0
Mute
Digital Mixer Mute. Setting this bit mutes the respective input signal, both left and right inputs.
GL[5:0]
Left Volume Control. The GL[5:0] bits are used to control the digital mixer left channel input
volume. Each step corresponds to 1 dB gain adjustment. The total range is 0 dB to -63 dB
gain.
GR[5:0]
Right Volume Control. The GR[4:0] bits are used to control the digital mixer right channel in-
put volume. Each step corresponds to 1 dB gain adjustment. The total range is 0 dB to -63 dB
gain.
Default
8000h. This value corresponds to 0 dB gain and Mute ‘set’.
If the digital mixer signals an overflow condition by setting the MLOF or MROF bit in the IEC Status Register
(Index 6Eh, Address 0Bh), the controller should correct the error by reducing the digital mixer input volumes in these
registers. The Digital Mixer Input Volume Registers are listed in Table 17.
Register Address
Function
00h
PCM Input Volume
01h
ADC Input Volume
02h
SDI1 Volume
03h
SDI2 Volume
04h
SDI3 Volume
05h
ZV Volume
Table 17. Digital Mixer Input Volume Register Index
46
DS489PP2