
3-287
TABLE 24. CARRIER LOOP FILTER GAIN (ACQ) CONTROL REGISTER
DESTINATION ADDRESS = 10
BIT
POSITION
FUNCTION
DESCRIPTION
31-24
Not Used
No programming required.
23-18
Reserved
Reserved. Set to 0 for proper operation.
17-14
Carrier Lead Gain
Mantissa (Acquisition)
These bits are the 4 fractional bits of the lead gain mantissa shown below.
Lead Gain Mantissa = 0 1. 2
-1
2
-2
2
-3
2
-4.
This format provides a mantissa range from 1.0 to 1.9375 for mantissa settings from 0000 to 1111 Binary.
Bit position 17 is the MSB.
13-9
Carrier Lead Gain
Exponent (Acquisition)
These bits set the lead gain exponent as given by:
Carrier Lead Gain Exponent = 2
-(32-E).
where E corresponds to the 5-bit binary value programmed here. Thus, a gain range from
2
-1
to 2
-32
(relative to the MSB position of the NCO control word) may be achieved for E = 11111 to 00000
Binary. Bit position 13 is the MSB.
8-5
Carrier Lag Gain
Mantissa (Acquisition)
Format same as lead gain mantissa. Bit position 8 is the MSB.
4-0
Carrier Lag Gain
Exponent (Acquisition)
Format same as lead gain exponent. Bit position 4 is the MSB.
TABLE 25. CARRIER LOOP FILTER GAIN (TRK
)
CONTROL REGISTER
DESTINATION ADDRESS = 11
BIT
POSITION
FUNCTION
DESCRIPTION
31-24
Not Used
No Programming required.
23-18
Reserved
Reserved. Set to 0 for proper operation.
17-14
Carrier Lead Gain
Mantissa (Track)
Format same as lead gain mantissa (see Table 24). Bit position 17 is the MSB.
13-9
Carrier Lead Gain
Exponent (Track)
Format same as lead gain exponent (see Table 24). Bit position 13 is the MSB.
8-5
Carrier Lag Gain
Mantissa (Track)
Format same as lead gain mantissa (see Table 24). Bit position 8 is the MSB.
4-0
Carrier Lag Gain
Exponent (Track)
Format same as lead gain exponent (see Table 24). Bit position 4 is the MSB.
TABLE 26. FREQUENCY SWEEP/ AFC LOOP CONTROL REGISTER
DESTINATION ADDRESS = 12
BIT
POSITION
FUNCTION
DESCRIPTION
31-27
Reserved
Reserved. Set to 0 for proper operation.
26-23
Sweep Rate Mantissa
(Acquisition)
Sets carrier track sweep rate used during acquisition (see Frequency Sweep Block Section). Format
same as lead gain mantissa (see Table 24). Bit position 22 is the MSB.
22-18
Sweep Rate Exponent
(Acquisition)
Sets carrier track sweep rate used during acquisition (see Frequency Sweep Block Section). Format
same as lead gain exponent (see Table 24). Bit position 22 is the MSB. M = 0000,
E = 00000 is 2
-28
.
17-14
AFC Gain Mantissa
(Acquisition)
Sets Frequency Error Gain. Format same as lead gain mantissa (see Table 24). Bit position 11 is the
MSB.
13-9
AFC Gain Exponent
(Acquisition)
Sets Frequency Error Gain. Format same as lead gain exponent (see Table 24). Bit position 4 is the MSB.
HSP50210