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Symmetrical, extended and fast direct connections between variable grain blocks in FPGA integrated circuits

  • US 6,275,064 B1
  • Filed: 12/22/1997
  • Issued: 08/14/2001
  • Est. Priority Date: 12/22/1997
  • Status: Expired due to Term
First Claim
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1. A field programmable gate array device comprising:

  • (a) a plurality of variable grain blocks (VGBS) each carrying out one or more program-defined logic functions, each having inputs for receiving respective input signals and each having outputs for outputting respective output signals; and

    (b) a plurality of interconnect lines for routing signals between the plurality of variable grain blocks (VGBs), the plurality of interconnect lines including a programmably configurable first portion for providing program-defined routing of signals between the plurality of variable grain blocks (VGBs);

    wherein the plurality of VGBs includes;

    (a.1) a first VGB having a top, right, bottom and left side, wherein first and second inputs are located at the top side;

    (a.2) a second VGB having a top, right, bottom and left side, wherein first and second outputs are located at the top side;

    wherein the plurality of interconnect lines further includes a second portion comprising;

    (b.1) a first direct connect line connecting the first output of the second VGB directly to a respective input of the first VGB; and

    (b.2) a second direct connect line connecting the second output of the second VGB directly to respective input of the first VGB.

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