DLLs Maximize I/O Speed

• Clock-to-output time plus set-up time determinesthe I/O speed and data bandwidth

  • min clock period = max clock-to-out + max set-up

• Traditional solution:

  • use highly buffered, balanced clock trees
    • needed to reduce internal clock skew
    • cannot totally eliminate the delay

• The Virtex solution:

  • use a Delay-Locked-Loop ( DLL )
    • aligns the internal and external clocks
    • effectively eliminates the clock-distribution delay

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