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AR# 52724

LogiCORE IP Video Timing Controller (VTC) v5.01.a - Why does VTC Generation always wait for VTC Detection to lock when both VTC Generation and VTC Detection are enabled?

Description

Why does VTC Generation always wait for VTC Detection to lock when both VTC Generation and VTC Detection are enabled?

Solution

This known issue affects the Video Timing Controller v5.00.a and v5.01.a when both VTC Generation and VTC Detection are enabled.

Reserved Bit

To work around this issue, you should set CONTROL register bit 12 (marked as Reserved) to '1'. This register can always be set to '1' without any side affects. The need to set bit 12 has been fixed in the Video Timing Controller v5.01.a Rev2, or later pCore patch, and in the Video Timing Controller v6.0.

Generator Vertical Blank Offset Source Select

The CONTROL register bit 17 which is marked as reserved in the Product Guide for the Video Timing Controller v5.01, and the v5.01.a as reserved is actually the Generator Vertical Blank Offset Source Select register.

If you want the Video Timing Controller Detection and Generation to be synchronized, set it to '0'.
If you want the Video Timing Controller Detection and Generation to operate independently, set it to '1'.

  • 0: selects F0_VBLANK_HSTART from detection register (0x003c) selects F0_VBLANK_HEND from detection register (0x003c)
  • 1: selects F0_VBLANK_HSTART from generator register (0x007c) selects F0_VBLANK_HEND from generator register (0x007c)


For a detailed list of LogiCORE IP Video Timing Controller Release Notes and Known Issues, see (Xilinx Answer 32754).

Linked Answer Records

Master Answer Records

AR# 52724
Date Created 11/01/2012
Last Updated 05/15/2013
Status Active
Type General Article
IP
  • Video Timing Controller