Detailed Mechanism Of Stdi Block Horizontal/Vertical Lock Mechanism - Analog Devices Advantiv ADV7604 Hardware Manual

CH2_TRIG_STDI Trigger Standard Identification for channel 2 , CP Map, Address 0x42, [2]
Function
CH2_TRIG_STDI
0
1
CH1_STDI_DVALID Standard Identification Data Valid for channel 1 Read Back , CP Map,
Address 0xB1, [7]
Function
CH1_STDI_
DVALID
x
CH2_STDI_DVALID Standard Identification Data Valid for channel 2 Read Back , CP Map,
Address 0x49, [7]
Function
CH2_STDI_
DVALID
x

10.8.3 Detailed Mechanism of STDI Block Horizontal/Vertical Lock Mechanism

10.8.3.1 STDI Horizontal Locking Operation
For the STDI horizontal locking operation, the STDI block compares adjacent line length
differences (in XTAL clock cycles) with the programmed threshold. If 128 consecutive adjacent
lines lengths are within the threshold, the STDI will horizontally locks to the incoming video.
Rev. F August 2010
Description
0 to 1 transition triggers the channel 2 STDI measurements. Not self
clearing, must be reset by the user. 0 does nothing.
Not self clearing, must be reset by the user for next trigger. 1 restarts
channel 2 STDI measurements.
Description
Set by ADV7604 as soon as measurement of the channel 1 STDI is
finished. High level signals validity of BL, LCF, LCVS, FCL, and
CH1_STDI_INTLCD parameters. To prevent false readouts, especially
during signal acquisition, CH1_SDTI_DVALID only goes high after
four fields with same length are recorded. As a result, measurements can
take up to five fields to finish.
Description
Set by ADV7604 as soon as measurements of the channel 2 STDI is
finished. High level signals validity of BL, LCF, LCVS, FCL, and
CH2_STDI_INTLCD parameters. To prevent false readouts, especially
during signal acquisition, CH2_SDTI_DVALID only goes high after
four fields with same length are recorded. As a result, measurements can
take up to five fields to finish.
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ADV7604