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add support for 64-bit and 256 MGT databus interface

Larry Lou Jr Ruckman requested to merge lruckman/lpgbt-emul:master into master

Description

  • Making timing for the FEC12 encoder at 320 MHz is difficult (if not impossible)
  • By going to a 64-bit MGT interface, the logic can run at 160 MHz and much easier to make timing for the FEC12 encoder
  • 32-bit was previously supported
    • No changes required
  • This update provides 64-bit and 256-bit support
  • 128-bit is still not supported
  • Adding support for c_clockRatio
    • prevent counter "out of range" synthesis error
Edited by Larry Lou Jr Ruckman

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