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

SubjectAuthor
* Why Xilinx Ten Gigabit Ethernet PCS/PMA IP Core 32-bit version useQiu Shui
`- Re: Why Xilinx Ten Gigabit Ethernet PCS/PMA IP Core 32-bit versionHariprasad Bhat

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

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Subject: Why Xilinx Ten Gigabit Ethernet PCS/PMA IP Core 32-bit version use
less resources than 64-bit version?
From: beyond2...@gmail.com (Qiu Shui)
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 by: Qiu Shui - Sat, 3 Jul 2021 04:43 UTC

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.

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

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Subject: Re: Why Xilinx Ten Gigabit Ethernet PCS/PMA IP Core 32-bit version
use less resources than 64-bit version?
From: pharipra...@gmail.com (Hariprasad Bhat)
Injection-Date: Sun, 01 May 2022 06:51:54 +0000
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 by: Hariprasad Bhat - Sun, 1 May 2022 06:51 UTC

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


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

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