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

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4.2.1 Display Timing Reference Codes
VDOUT[9−2]
80.0 80.0 10.0
FF.C
00.0 00.0
Cb 0
Y 2
Cb 359
Y 718
Cr 359
Y 719
Y 0
Cr 0
Y 1
Cb 1
One Line
XY.0
10.0 80.0 10.0
FF.C
00.0 00.0
XY.0
80.0 80.0 10.0
FF.C
00.0 00.0
XY.0
10.0
855 856 857 0 1 2 718 719 720 721 722 723720 721 722 723
FPCOUNT
SAVEAV Blanking Data EAV
Active Video
Blanking
VCLKOUT
Next Line
4
4268 1440
One Line
861 862 863 0 1 2 718 719 720 721 722 723720 721 722 723
FPCOUNT
Active VideoBlanking
VCLKOUT
Next Line
4
4280 1440
VDOUT[9−2]
80.0 80.0 10.0
FF.C
00.0 00.0
Cb 0
Y 2
Cb 359
Y 718
Cr 359
Y 719
Y 0
Cr 0
Y 1
Cb 1
XY.0
10.0 80.0 10.0
FF.C
00.0 00.0
XY.0
80.0 80.0 10.0
FF.C
00.0 00.0
XY.0
10.0
SAVEAV Blanking Data EAV
BT.656 Video Display Mode
The end active video (EAV) code and start active video (SAV) code are issued at the start of each video
line. EAV and SAV codes have a fixed format. The format is shown in Table 3-2 . The EAV and SAV
codes define the end and start of the horizontal-blanking interval, respectively, and they also indicate the
current field number and the vertical blanking interval. The SAV and EAV codes have a 4-bit protection
field to ensure valid codes. The video display module generates these protection bits as part of the SAV
and EAV codes. Table 3-3 shows possible combinations of valid SAV and EAV codes with their protection
bits. The video display pipeline generates SAV and EAV sync codes and inserts them into the output
video stream according to the BT.656 specification.
The BT.656 line timing is shown in Figure 4-9 and Figure 4-10 . Each line begins with an EAV code, a
blanking interval, an SAV code, followed by the line of active video. The EAV code indicates the end of
active video for the previous line, and the SAV code indicates the start of active video for the current line.
Figure 4-9. 525/60 BT.656 Horizontal Blanking Timing
Figure 4-10. 625/50 BT.656 Horizontal Blanking Timing
SPRUEM1 – May 2007 Video Display Port 99
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