AN543
Rev. 0.9
161
Property 0x3210 FM_POP_NOISE_SCALE
The FM_POP_NOISE_SCALE property sets the scale for the FM pop filter. 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.
Default: 127
Property 0x3400 FM_MULT_EQ_CTL (Si4754/55/56/57 Only)
The FM_MULT_EQ_CTL property controls the multipath channel equalizer. 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: 0x0601
Si475x/5xC-A55, Default: 0x8001
FM_POP_NOISE_SCALE
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0x00
SCALE[7:0]
0x00
0x7F
Bit
Name
Function
15:8
Reserved
Always write to 0.
7:0
SCALE[7:0]
Sets the scale for the FM pop filter. This allows users to scale back the pop
filter. Default is 127. Range is 0–127, which scales the pop filter from full on
(127) to full off (0)
FM_MULT_EQ_CTL
15
14
13
12
11 10
9
8
7
6
5
4
3
2
1
0
SOURCE
CMA_CTRL_MP
0
NUM_TAPS[4:0]
0x00
MULT_EQ_CTL[1:0]
1
0
0
0x00
0x00
0x1
Bit
Name
Function
15
SOURCE
(Available in Si475x/5xC-A55 and later only. Otherwise write to 0.)
When NUM_TAPS is in auto mode, this sets the metric source to use for
determining the number of taps to use.
0 = Determine number of taps from RSSI metric.
1 = Determine number of taps from SNR metric.
14
CMA_CTRL_MP
Sets the CMA_CTRL_MP value between a less aggressive setting and a more
aggressive setting.
0 = less aggressive setting.
1 = more aggressive setting.
