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Adventurer
Adventurer
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Registered: ‎02-18-2019

Block Synchronisation for Synchronous Gearbox

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Hi,

If we are using Synchronous Gearbox Encoding for 64B/66B encoding.

And as per UG-578 Block Synchronization State machine (pg-303) the logic for generation of slip (rxgearboxslip) signal includes sh_invalid-cnt = 16 or block_lock = FALSE. After we have asserted the slip for how many cycles we have to wait for the slip effect to take place.

 

Regards,

Sankalp Malpani

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Xilinx Employee
Xilinx Employee
219 Views
Registered: ‎10-19-2011

Re: Block Synchronisation for Synchronous Gearbox

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Hi sankalp@96 ,

have a look at the last sentence on page 304: "After the RXGEARBOXSLIP is issued, the state machine waits 32 RXUSRCLK2 cycles before checking for valid synchronization headers."

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Teacher
Teacher
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Registered: ‎07-09-2009

Re: Block Synchronisation for Synchronous Gearbox

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Have you tried simulating to see ?
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Xilinx Employee
Xilinx Employee
220 Views
Registered: ‎10-19-2011

Re: Block Synchronisation for Synchronous Gearbox

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Hi sankalp@96 ,

have a look at the last sentence on page 304: "After the RXGEARBOXSLIP is issued, the state machine waits 32 RXUSRCLK2 cycles before checking for valid synchronization headers."

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