SDA 9400
Field detection and VIN delay
CLK1
H1
H2
VIN
Vd
(VINDEL * 128 + 1) * Tclk1
x
Field 1(A)
Ffd
VIN
(VINDEL * 128 + 1) * Tclk1
Vd
x
Ffd
Field 2(B)
Input write parameter
Parameter
Subaddress
[Default value]
Description
VINDEL
[0]
01h
Delay of the incoming V-Sync VIN (must be adjusted
depending on the delay of the HIN signal)
FIEINV
00h
Inversion of the internal field polarity
1: Field A=1
0: Field A=0
[0]
VCRMODE
00h
In case of non standard interlaced signals (VCR, Play-
Stations) a filtering of the internal field signal has to be
done (should also be used for normal TV signals)
1: on
0: off
[1]
In case of non-standard signals the field order is indeterminate (e.g. AAA... , BBB... , AAABAAAB...,
etc.). Therefore a special filtering algorithm is implemented, which can be switched on by the
parameter VCRMODE. It is recommended to set the parameter VCRMODE=1. In other case
(VCRMODE=0) an additional internal signal VTSEQ is generated. This signal goes high
(VTSEQ=1), if at least the last two fields were identical. Due to the fixed storage places of the fields
in the internal memory block, this information is necessary for the scan rate conversion processing
(see also Output sync controller (OSC) on page 40, it is recommended in case of VCRMODE=0 to
choose an adaptive operation mode).
The OPDEL parameter is used to adjust the outgoing V-Sync VOUT in relation to the incoming
delayed V-Sync VIN. In case of 50 Hz to 100 Hz interlaced scan rate conversion the OPDEL
parameter should be greater than half the number of lines of a field plus the internal processing
delay (8 lines).
Micronas
13
Preliminary Data Sheet
MICRONAS [ MICRONAS ]
