Why Xilinx Ten Gigabit Ethernet PCS/PMA IP Core 32-bit version use less resources than 64-bit version?...

Q

Qiu Shui

Guest
The 32-bit version should have better latency performance but I think it\'s more complex, so it should use more resources.

But as the link below

https://www.xilinx.com/html_docs/ip_docs/pru_files/ten-gig-eth-pcs-pma.html

32-bit version is better in all kinds of aspects of resource utilization.

If the 32-bit version has better latency, needs less resource. What\'s its cost to get these advantages?

I\'m totally confused.
 
H

Hariprasad Bhat

Guest
On Saturday, July 3, 2021 at 10:13:23 AM UTC+5:30, beyon...@gmail.com wrote:
The 32-bit version should have better latency performance but I think it\'s more complex, so it should use more resources.

But as the link below

https://www.xilinx.com/html_docs/ip_docs/pru_files/ten-gig-eth-pcs-pma.html

32-bit version is better in all kinds of aspects of resource utilization.

If the 32-bit version has better latency, needs less resource. What\'s its cost to get these advantages?

I\'m totally confused.
Hi,

64-bit data path needs double the registers for pipelining & data outputs compared to 32-bit data path. That would be the reason for increased resources. But, the difference in resources are not in a greater scale as per the Xilinx table in the above link.
With 64-bit interface, the user clock will be half of that of 32-bit version.
I feel that\'s the big advantage of running the core @ lesser clock frequency compared to 32-bit version.

With Regards,
HP Bhat
 

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