GDC21D003 Datasheet, PDF (20/77 Pages) Hynix Semiconductor – VSB Receiver

Address 4:
[7:6]
5
PolarityW
4
Polarity
[3:2]
1
nSyncLockrst
0
VSBmodW
GDC21D003
W Initial value is “00”. It would be better set to “01”.
W
Polarity signal write enable. If this bit is set to ‘1’, it means write enable.
Initial value is ‘0’.
Polarity signal for polarity control and DATAPOLP/DATAPOLN. If
W
PolarityW is ‘1’, this signal is used for polarity control and the generation of
DATAPOLP/DATAPOLN signal output. Otherwise the polarity control block
uses internally calculated signal. Initial value is ‘0’. (refer to table 6.3.2)
W Always set to “10”.
nSyncLock reset control signal. If this bit is set to ‘0’, nSyncLock signal isn't
W
initialized by the change of VSB mode. Otherwise, nSyncLock signal is
initialized and changed to ‘0’ for the next Field sync duration. Initial value is
‘0’.
W
VSB mode write enable. If this bit is set to ‘1’, it means write enable.
Initial value is ‘0’.
Address 5:
[7:6]
VCXOSEL
[1:0]
5
nCombW
4
nComb
3
Combouthalf
[2:1]
NoCombgain
[1:0]
0
VCXO Selection. These pins should be set as follows according to the output
frequency of VCXO.
W ^VCXOSEL[1:0]
00
The output frequency of VCXO
fs(10.76Mhz)
01
2fs(21.52Mhz)
Initial value is “00”.
W
nComb signal write enable. If this bit is set to ‘1’, it means write enable.
Initial value is ‘0’.
Comb filter ON/OFF signal. If nCombW are ‘1’, this signal is used for Comb
W filter ON/OFF signal. Otherwise the Comb filter ON/OFF signal is generated
internally. Initial value is ‘1’.
Comb filter output gain selection signal. If this bit is set to ‘0’, the gain of the
W Comb filter output is 1. Otherwise its gain is 1/2. When Comb filter is activated
this signal is valid. Initial value is ‘1’.
NoComb path gain selection signal. The gain is as follows;
NoCombgain[1:0] the gain of normal path
“00”
1(0dB)
W
“01”
1.125(1.023dB)
“10”
1.1875(1.493dB)
“11”
1.25(1.938dB)
Initial value is “01”.
W Always set to ‘0’.
Address 6:
[7:0] DCvalue[7:0] R Calculated DC value of input data.
Address 7:
[7:0]
R don’t care
21