AN543
Rev. 0.9
163
Property 0x3401 FM_MULT_EQ_NOISE_DISABLE (Si4754/55/56/57 Only)
The FM_MULT_EQ_NOISE_DISABLE property sets the RSSI threshold below which the channel equalizer will
use noise measurements to enable/disable the 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, Default: 0xFC81
Si475x-A40 and later, Default: 0xFCFA
Property 0x3402 FM_MULT_EQ_CTL_STEP (Si4754/55/56/57 Only)
The FM_MULT_EQ_CTL_STEP property controls the multipath channel equalizer tap updating step. 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: 0x0000
FM_MULT_EQ_NOISE_DISABLE
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MULT_EQ_ON_LEVEL[7:0]
MULT_EQ_OFF_LEVEL[7:0]
0xFC
0xFA
Bit
Name
Function
15:8
MULT_EQ_ON_LEVEL[7:0]
RSSI level above which noise measurements will not be used to enable/
disable the equalizer. Range is –127 to 127.
7:0
MULT_EQ_OFF_LEVEL[7:0]
RSSI level below which noise measurements will be used to enable/dis-
able the equalizer. Set to –127 (0x81) to disable.
Range is –127 to 127.
FM_MULT_EQ_CTL_STEP
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
STEP[15:0]
0x0000
Bit
Name
Function
15:0
STEP[15:0]
Sets the multipath channel equalizer tap updating step. The number
should always be a positive number. Higher number indicates higher
updating step. Default is 0 (on chip control).
