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Acquisition of extended display identification data (EDID) using inter-IC (I2C) protocol

  • US 20060082584A1
  • Filed: 02/18/2005
  • Published: 04/20/2006
  • Est. Priority Date: 10/18/2004
  • Status: Active Grant
First Claim
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1. In a VESA standard compliant display controller having a processor arranged to process executable instructions and associated data, a memory device arranged to store EDID and the executable instructions and associated data, a number of data ports coupled to the memory device by way of an I2C data bus each coupled to a host device, a method of transferring EDID from the memory device over the I2C data bus to a request one of the data ports while servicing a processor memory access request without clock stretching, comprising:

  • generating an EDID read request by the host device;

    passing the EDID read request by way of the requesting port to the memory device;

    transferring the requested EDID from the memory device to a data buffer, granting memory access to the processor;

    reading the requested EDID from the buffer in a byte by byte manner; and

    sending each byte of data through the requesting data port bit by bit to the host device wherein the requesting data port is provided access to the memory device as needed without clock stretching thereby maintaining compliance to the VESA standard.

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