GDC21D003 Datasheet, PDF (54/77 Pages) Hynix Semiconductor – VSB Receiver

GDC21D003
7
nFreezePHI2
6
InitPHI2
3
nFreezeEQI2
2
InitEQI2
[1:0]
STEPsizeIN
[1:0]
Table 6.4.1 Contents of I²C Bus Register33 for Equalizer
‘0’ : Freezes the Phase Tracker in the device, which means phase tracking does
not occur.
W/R ‘1’ : normal operation
If you want to control Phase Tracker fast, use external input pins.
Default value is ‘1’.
‘1’ : Initializes the Phase Tracker in the device.
W/R
‘0’ : normal operation
If you want to control Phase Tracker fast, use external input pins. Default value
is ‘0’.
‘0’ : Freezes the Equalizer in the device, which means coefficient update does
not occur.
W/R ‘1’ : normal operation
If you want to control Equalizer fast, use external input pins.
Default value is ‘1’.
‘1’ : Initializes the Equalizer in the device.
W/R
‘0’ : normal operation
If you want to control Equalizer fast, use external input pins.
Default value is ‘0’.
There are three available step-sizes in the Equalizer.
00,01 : smallest step size
W/R
10 : middle step size
11 : largest step size
Default value is “11”.
The mean squared errors are calculated at equalizer
input and output, and these can be read by using
I²C bus. The location of center tap could be
changed using I²C bus, so the equalization range
could be adjusted according to channel condition.
If you set nIIR16ONIN or nIIRONIN, the decision
feedback filter is turned off for 2, 4, and 16 VSB
mode.
Table 6.4.2 Contents of I²C Bus Register33 for Filter Control
‘0’ : feedback filter is on in 16 VSB mode
7
nIIR16ONIN W/R ‘1’ : feedback filter is off
Default value is ‘1’.
‘0’ : feedback filter is on in 2, 4 and 8 VSB mode
6
nIIRONIN
W/R ‘1’ : feedback filter is on in only 8 VSB mode
Default value is ‘0’.
55