GC5018_06 Datasheet, PDF (116/134 Pages) Texas Instruments – 8-CHANNEL WIDEBAND RECEIVER

GC5018
8-CHANNEL WIDEBAND RECEIVER
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.28 SYNC_0 Register
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Register name: SYNC_0
BIT 15
unused
0
0
BIT 7
unused
0
1
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
ssel_cic(2:0)
0
0
unused
0
Address: 0x1B
ssel_pmeter(2:0)
0
0
ssel_agc_freeze(2:0)
1
0
unused
0
ssel_serial(2:0)
0
0
BIT 8
0
BIT 0
0
ssel_cic(2:0) : Selects the sync source for the DDC CIC filter, thus setting the decimation moment.
ssel_pmeter(2:0) : Selects the sync source for the channel power meter.
ssel_agc_freeze(2:0) : Selects the sync that is used to hold the AGC in freeze mode. With this
functionality the user can program the AGC freeze control to look at the state of an input
sync, or the one shots. It defaults to being off or not looking at any syncs and not driving the
freeze control. This way, upon startup, the chip looks at the MPU register bit for AGC
freezing and not the syncs.
ssel_serial(2:0) : Selects the sync source for the DDC serial interface state machines.
Sync sources are contained in this and many of the following registers. For all sync source selections:
ssel_XXXX(2:0)
000
001
010
011
100
101
110
111
Selected sync source for DDC
rxsyncA
rxsyncB
rxsyncC
rxsyncD
DDC sync counter
one shot (register write triggered)
always 0
always 1
116 GC5018 GENERAL CONTROL