Hello,
I am looking how to calculate the SYSREF for the case:
800Mhz clock, 9Bit, 8B/10B, 4 Lanes.
Sincerely,
Giora

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Hello,
I am looking how to calculate the SYSREF for the case:
800Mhz clock, 9Bit, 8B/10B, 4 Lanes.
Sincerely,
Giora

Hi Giora,
Looks like you are looking at JMODE3. In JMODE 3 with 800MHz clock the serdes rate = DEV CLK X R factor from table 816 Operating modes. R = 12.5
Serdes Rate = 800MHz x 12.5 = 10Gbps.
Sysref freq = Serdes Rate / (K x F x 10 x n) Where n is positive integer 1,2,3........
From Table above lets pick K = 32, F = 5, n = 1
Sysref Freq = 10Gbps/(32 x 5 x 10 x 1) => 6.25MHz
Regards,
Neeraj