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4430-V & VN BPSK/QPSK VME Demodulator & Optional Modulator User’s Manual
Doc: 4430_V,VN.fm, © 11 Jul 2005, 14:55
3.5.5
Register 00h, 01h, 02h, 03h (01h, 03h, 05h, 07h), Demod Carrier Freq NCO
This group of registers provides the programming interface to the demodulator
carrier frequency NCO. The registers are to be programmed in a group as a sin-
gle 32-bit integer value. The value programmed into the registers are based on
the following equation:
Register Value = Demod f
c
x
214.74837
Results are rounded to the nearest integer and then cleaved into four separate
bytes as shown in
Figure 3.5.5
.
Figure 3.5.5: Bit Assignments, Demodulator Carrier Frequency NCO Registers
Demod Carrier Frequency [Bit weight = 1] LSB
Demod Carrier Frequency [Bit weight = 2]
Demod Carrier Frequency [Bit weight = 4]
Demod Carrier Frequency [Bit weight = 8]
Demod Carrier Frequency [Bit weight = 16]
Demod Carrier Frequency [Bit weight = 32]
Demod Carrier Frequency [Bit weight = 64]
Demod Carrier Frequency [Bit weight = 128]
7
6
5
4
3
2
1
0
0/1
0/1 0/1
0/1
0/1
0/1
0/1
0/1
Reg. 00h
Demod Carrier Frequency [Bit weight = 256]
Demod Carrier Frequency [Bit weight = 512]
Demod Carrier Frequency [Bit weight = 1024]
Demod Carrier Frequency [Bit weight = 2048]
Demod Carrier Frequency [Bit weight = 4096]
Demod Carrier Frequency [Bit weight = 8192]
Demod Carrier Frequency [Bit weight = 16348]
Demod Carrier Frequency [Bit weight = 32768]
7
6
5
4
3
2
1
0
0/1
0/1 0/1
0/1
0/1
0/1
0/1
0/1
Reg. 01h
Demod Carrier Frequency [Bit weight = 65536]
Demod Carrier Frequency [Bit weight = 131072]
Demod Carrier Frequency [Bit weight = 262144]
Demod Carrier Frequency [Bit weight = 524288]
Demod Carrier Frequency [Bit weight = 1048576]
Demod Carrier Frequency [Bit weight = 2097152]
Demod Carrier Frequency [Bit weight = 4194304]
Demod Carrier Frequency [Bit weight = 8388608]
7
6
5
4
3
2
1
0
0/1
0/1 0/1
0/1
0/1
0/1
0/1
0/1
Reg. 02h
Demod Carrier Frequency [Bit weight = 16777216]
Demod Carrier Frequency [Bit weight = 33554432]
Demod Carrier Frequency [Bit weight = 67108864]
Demod Carrier Frequency [Bit weight = 134217728]
Demod Carrier Frequency [Bit weight = 268435456]
Demod Carrier Frequency [Bit weight = 536870912]
Demod Carrier Frequency [Bit weight = 1073741824]
Demod Carrier Frequency [Bit weight = 2147483648] MSB
7
6
5
4
3
2
1
0
0/1
0/1 0/1
0/1
0/1
0/1
0/1
0/1
Reg. 03h
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