Video Port/VCXO Interpolated Control (VIC) Port User's Guide

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Optional blanking
Line 4
Image: Field 1
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Line 266
Optional blanking
Image: Field 2
Line 3
H = 1 (EAV)
H = 0 (SAV)
1(V = 1)
10 (V = X)
20 (V = 0)
264 (V = 1)
273 (V = X)
283 (V = 0)
525 (V = 0)
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Image: Field 1
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Image: Field 2
H = 1 (EAV)
H = 0 (SAV)
1(V = 1)
23 (V = 0)
311 (V = 1)
336 (V = 0)
625 (V = 1)
Line 1
Line
313
Line 625
525 lines/60 Hz 625 lines/50 Hz
Field 1
(F = 0)
Field 2
(F = 1)
Field 1
(F = 0)
Field 2
(F = 1)
624 (V = 1)
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BT.656 Video Display Mode
SAV and EAV codes are identified by a 3-byte preamble of FFh, 00h, and 00h. This combination must be
avoided in the video data output by the video port to prevent accidental generation of an invalid sync
code. The video display module provides programmable maximum and minimum value clipping on the
video data to prevent this possibility.
The typical values for H, V, and F on different lines are shown in Table 4-2 and Figure 4-11 .
F and V are only allowed to change at EAV sequences. The EAV and SAV sequences must occupy the
first four words and the last four words of the digital horizontal-blanking interval, respectively. The EAV
code is inserted when FPCOUNT = HBLNKSTART. The SAV code is inserted when FPCOUNT =
HBLNKSTOP.
Table 4-2. BT.656 Frame Timing
Line Number
625/50 525/60 F V Description
624-625 1-3 1 1 Vertical blanking for field 1, EAV/SAV code still indicates field 2.
1-22 4-19 0 1 Vertical blanking for field 1. Change EAV/SAV code to field 1.
23-310 20-263 0 0 Active video, field 1.
311-312 264-265 0 1 Vertical blanking for field 2, EAV/SAV code still indicates field 1.
313-335 266-282 1 1 Vertical blanking for field 2. Change EAV/SAV code to field 2.
336-623 283-525 1 0 Active video, field 2.
Figure 4-11. Digital Vertical F and V Transitions
H H H H
Line Number F V (EAV) (SAV) Line Number F V (EAV) (SAV)
1-3 1 1 1 0 1-22 0 1 1 0
4-19 0 1 1 0 23-310 0 0 1 0
20-263 0 0 1 0 311-312 0 0 1 0
264-265 0 1 1 0 313-335 1 1 1 0
266-282 1 1 1 0 336-623 1 0 1 0
283-525 1 0 1 0 624-625 1 1 1 0
Video Display Port100 SPRUEM1 – May 2007
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