SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
A digital representation of video can be realized by using HSYNC and VSYNC signals to identify frame start and line start. Suppose HSYNC and VSYNC are active high, Figure 11-26 shows the general relationship of these signals.
Figure 11-26 Discrete Sync SignalsEvery PIXCLK cycle carries either an active pixel or a blanking pixel. VSYNC pulses between two fields (or frames, in the case of progressive video). HSYNC pulses to signify the beginning of every line. An ACTVID signal can be used as a data valid to specify active video.
Discrete Sync cannot be used with any multi-camera multiplexed stream inputs. In the device, if Port A is configured for 24-bit discrete sync, then Port B must be disabled since there are no more data input pins left over for Port B.
If Port A is not 24 bits, then the 8-bit Port B can be configured and enabled for either discrete or embedded sync.