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

Started by Qiu Shui July 3, 2021
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.