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Methods and apparatus for improved memory access

  • US 7,313,035 B2
  • Filed: 01/10/2005
  • Issued: 12/25/2007
  • Est. Priority Date: 10/31/2002
  • Status: Expired due to Term
First Claim
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1. A method for accessing data from an input/out port while a shift register shifts according to shift clock signals, comprising:

  • sampling a data signal from the input/output port before the shift register shifts in a shift input data signal;

    holding the sampled data signal until after the shift register shifts in the shift input data signal;

    shifting the shift input data signal into the shift register;

    overwriting the shift input data signal with the sampled data signal before the shift register shifts out the shift input data signal; and

    shifting the sampled data signal out of the shift register.

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