DS90UB947-Q1: How to calculate UI(fpdiii)

Zhiguo Li

Hi TI

I am testing the eye diagram of ds90ub947,the interface between DS90UB947 and CPU is dual channel LVDS,deserializer is DS90UB948,and using dual channel of Fpdlink to connect with DS90UB947

I have two questions:

1,how to calculate the PCLK of Fpdlink,is it the same with LVDS Colck?

2,i want to know how to calculate UI(fpdiii)?

Horizontal Lines =1200 Overhead=160

Vertical Lines=1600 Overhead=9

Fps=60

Best Regards

over 8 years ago

0 Steven(Shenzhen) Shi over 8 years ago

TI__Mastermind 30515 points

1. yes.
2. the 1UI = 1000000000/1360/1609/60/35 x2 = 435ps

best regards,
Steven

0 Zhiguo Li over 8 years ago in reply to Steven(Shenzhen) Shi

Prodigy 30 points

Hi Steven

Thank you for your reply, but I still have some questions about what 1000000000 represents, and the result of the formula seems to be not 435ps.Is it wrong for me to understand this formula?

Best regards

0 Steven(Shenzhen) Shi over 8 years ago in reply to Zhiguo Li

TI__Mastermind 30515 points

1s = 1000 000 000 ns. the calculation is dependent on your resolution provided by you.

regards,

Steven

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DS90UB947-Q1: How to calculate UI(fpdiii)