BU9409FV_12 Datasheet, PDF (44/58 Pages) Rohm – 32bit Audio DSP

BU9409FV
Technical Note
6. Mute function by command
Mute function by command is provided in BU9409FV.
It's possible to mute DSP's main and sub digital output by setting to &hFD [ 4 ] = 1h and MUTEX_DAC terminal and a
MUTEX_SP terminal both to L.
Setting the transition time of smooth mute
Mute the Main and Sub output of DSP.
Select the transition time of entering from 0dB to mute state.
Smooth transition time when releasing mute is about 22ms(fixed) .
Default = 0
Select Address
&h10 [ 1：0 ]
Value
0
1
2
3
Operating Description
Don’t use mute function.
10.8ms
5.4ms
2.7ms
7. Clock halt function of DSP part
Clock halt function of DSP part with terminal MUTEX_DAC and MUTEX_SP is provided in BU9409FV.
Clock halt function’s setting
Default = 0
Select Address
&hA9 [ 7 ]
Value
0
1
Operating Description
Don’t use the clock halt function
Use the clock halt function
When setting on using the clock halt function, then set the MUTEX_DAC and MUTEX_SP terminal on L ,the clock of DSP
part will be halted. If clock is halted, command can’t be sent and received in a part of the block. If &hA9 [ 7 ] is input from
MCLK into clock, command can be sent and received even on the clock halt condition.
When MUTEX_DAC or MUTEX_SP terminal is on H, the clock halt will be released.
Power consumption decreases in the clock halt condition.
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2012.03 - Rev.A