Xilinx Virtex-5 RocketIO GTP User Manual page 48

Chapter 3: Simulation
Using
Equation
48
Equation 3-2, PLL SPEED is 1.5625 GHz, meaning that the period is 640 ps. Using
3-3, SIM_PLL_PERDIV2 is 640 divided by 2 or 320 decimal (140 hexadecimal).
www.xilinx.com Virtex-5 RocketIO GTP Transceiver User Guide
UG196 (v1.3) May 25, 2007
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