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Video frame synchronization of independent timing generators for frame buffers in a master-slave configuration

  • US 5,963,200 A
  • Filed: 08/20/1997
  • Issued: 10/05/1999
  • Est. Priority Date: 03/21/1995
  • Status: Expired due to Term
First Claim
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1. An apparatus for synchronizing a vertical blanking signal for each of a plurality of independent frame buffers comprising:

  • a plurality of RAMDACs, each for coupling to a corresponding rendering controller and a display monitor which receives video signals, wherein one of said plurality of RAMDACs operates as a master and each of the other of said plurality of RAMDACs operates as a slave, each of said RAMDACS including logic which generates a vertical blanking signal, each of said slave RAMDACs including reset logic which generates a signal which resets said vertical blanking signal logic;

    wherein said RAMDAC operating as a master further comprises a field signal generator which generates a field signal which is provided to each of said plurality of RAMDACs operating as a slave, and each of said slave RAMDACs upon receipt of said field signal operates said reset logic to thereby synchronize the video signals provided to its corresponding display monitor.

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