A N 5 4 3
74
Rev. 0.9
Property 0x0404 FM_SOFT_MUTE_ATTACK_TIME
The FM_SOFT_MUTE_ATTACK_TIME property sets the maximum time in ms it takes to mute the audio. The CTS
bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read in
powerup mode.
Si475x-A20 and earlier, Si475x-A40 and later: This property is not available
Units: ms
Property 0x0405 FM_SOFT_MUTE_MAX_ATTENUATION_AGC (Si4754/55/56/57 Only)
When AGC is engaged, the FM_SOFT_MUTE_MAX_ATTENUATION_AGC property sets the maximum
attenuation in dB that will be applied by the RSSI/SNR softmute feature. The CTS bit (and optional interrupt) is set
when it is safe to send the next command. This property may only be set or read in powerup mode.
Si475x-A20 and earlier: This property is not available.
Si475x-A30 and later, Default: 0x0080
Bit
Name
Function
15:0
RELEASE[15:0]
Sets the maximum time in ms it takes to unmute the audio. Note that there
will be 16 ms of filter delay for RSSI/SNR metric before softmute can
engage/disengage.
Default is 500 ms. Range is 1–32767 ms.
FM_SOFT_MUTE_ATTACK_TIME
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ATTACK[15:0]
0x0078
Bit
Name
Function
15:0
ATTACK[15:0]
Sets the maximum time in ms it takes to mute the audio. Note that there will
be 16 ms of filter delay for RSSI/SNR metric before softmute can engage/
disengage.
Default is 120 ms. Range is 1–32767 ms.
FM_SOFT_MUTE_MAX_ATTENUATION_AGC
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0x00
IGNORE_AGC
SMATTN[6:0]
0x00
1
0x00
