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I/O cell configuration for multiple I/O standards

  • US 6,271,679 B1
  • Filed: 03/23/2000
  • Issued: 08/07/2001
  • Est. Priority Date: 03/24/1999
  • Status: Expired due to Term
First Claim
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1. A programmable logic integrated circuit comprising:

  • a plurality of first I/O circuits coupled to a supply voltage and a first configurable reference voltage; and

    a plurality of second I/O circuits coupled to the supply voltage and a second configurable reference voltage, wherein the first configurable reference voltage is different from the second configurable reference voltage and the plurality of first I/O circuits is compatible with a first I/O standard based on the first configurable reference voltage and the plurality of second I/O circuits compatible with a second I/O voltage standard based on the second configurable reference voltage.

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