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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
3.5.16
Register 3Ch (79h), Data Filter Cap Select/Input Pass Filter Select/QPSK Select
This register selects the range for the input low pass filter and the data filter. It
also is used to select the QPSK input format for the modulator.
Figure 3.5.16
illustrates the breakout of register bit assignments.
Figure 3.5.16: Register 3Ch Bit Assignments
Table 3.5.18: Data Filter Capacitor Select/Input Pass Filter Select/QPSK Select
Register Definition
This register is partially programmed based on results of the input low pass filter
selection processes previously outlined in
Section 3.5.15
Register 31h (63h), In-
put Low Pass Filter on page 50
.
7
6
5
4
3
2
1
0
0/1
-
0/1
0/1
0/1
0/1
0/1
0/1
Data Filter Range Select Bit 1
Data Filter Range Select Bit 2
Data Filter Range Select Bit 3
Unused
Input Low Pass Filter Select Bit 1
Input Low Pass Filter Select Bit 2
Input Low Pass Filter Select Bit 3
QPSK Input Data Format
Bit No.
Bit Name(s)
Functional Description
*07
QPSK Data Input
0 - I and Q signals via parallel inputs to the modulator
1 - I and Q signals via a serial input to the modulator
06-04
Low Pass Filter Select
000 = Range Step 0
001 = Range Step 1
011 = Range Step 3
111 = Range Step 7
03
Unused
Set to zero for proper operation
02-00
Data Filter Select
000 = Range Step 0
001 = Range Step 1
011 = Range Step 3
111 = Range Step 7
* Bit 7 must be set to the parallel mode for the modulator to work correctly when in BPSK
mode.
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