STV2050A STMicroelectronics, STV2050A Datasheet - Page 60

• Manufacturer Part Number: STV2050A
• Description: IC DGTL CONVERGENCE PROC 80-PQFP
• Manufacturer: STMicroelectronics
• Type: Videor

Specifications of STV2050A

• Applications: HDTV
• Mounting Type: Surface Mount
• Package / Case: 80-MQFP, 80-PQFP
• Case: QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STV2050A - OPTICAL LOOP
12.2.1 OPTT Pin used as an Input
The status of OPTT is available in S05 in register E5.
12.2.2 OPTT Pin used as an Output
The OPTT output can either be forced to the electrical “1” level, or can be programmed in the
same way as the auto-alignment pattern. This is carried out by the OOS bit in the E5 register.
In the latter case, the timing of the OPPT signal typically overlaps the auto-alignment pattern.
The final signal is used to control the OPTI and OPTT port functions. The timing for the signal
is defined by the ED and EE registers.
Offset values larger than one grid distance or invalid vertical grid numbers for start or stop po-
sition will cause unexpected results at the OPTT_PATTERN signal.
The OPTT_PATTERN signal is not influenced by the horizontal or vertical blanking function.
12.3 OPTI SENSOR STATUS PORT
The level applied to the OPTI pin can be read using the S11 bit in the E5 register.
The OPTI level can be ANDed with the window defined on the OPTT using the OPI in the E5
register.
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HG3
HO3
HG4
HO4
VG3
VO3
VG4
VO4
OOS
S05
OPI
0: < 0.7 V on OPTT
1: > 2.6 V on OPTT
0: Data output = the ODT bit in the E5 register
1: Programmable timing
Grid number of horizontal start
Offset of horizontal start (number of clock cycles, 1 grid max.)
Grid number of horizontal end
Offset of horizontal end (number of clock cycles, 1 grid max.)
Grid number of vertical start
Offset of vertical start (number of video lines, 1 grid max.)
Grid number of vertical end
Offset of vertical end (number of video lines, 1 grid max.)
0: S11 = OPTI AND window
1: No windowing