7.3.20.3 Video Timing Modes

The pattern generator has two video timing modes: external and internal. In external timing mode, the pattern generator detects the video frame timing present on the DE and VS inputs. If vertical sync signaling is not present on VS, the pattern generator determines the vertical blank by detecting when the number of inactive pixel clocks (DE = 0) exceeds twice the detected active line length. In internal timing mode, the pattern generator uses custom video timing as configured in the control registers. The internal timing generation may also be driven by an external clock. By default, external timing mode is enabled. Internal timing or Internal timing with External Clock are enabled by the control registers (Table 10).