hdin
vdin
vdin
0.5H
0.5H
0.25H 0.25H
0.25H 0.25H
Detected as “top”
Detected as “bottom”
vdin
fidin
Detected FID
(1) Latch FID input at VD rise edge
vdin
fidin
Detected FID
hdin
vdin
Detected VSYNC
Detected FID
hdin
vdin
Detected VSYNC
Detected FID
(2) Use raw FID input
(3) Use VD input as FID
(4) Detect VD phase
Internal Modules
108
SPRUHI7A – December 2012 – Revised June 2016
Copyright © 2012–2016, Texas Instruments Incorporated
High-Definition Video Processing Subsystem (HDVPSS)
Figure 1-62. Field Detection Mode
In option4 (Detect VD phase), the timing generator detects VD asserted position in a line. When vdin
occurs within 0.25H around hdin, the fid is detected as “top.” Otherwise, the fid is detected as “bottom.”
shows this detection scheme. When in non-standard mode, field id is always detected as “top”
in option4.
Figure 1-63. Field Detection by VD Phase (FMD=3)