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<tnt>
Does anyone know of ECP5 board with SFPs slots ... not connected to transceivers ? (it's for STM-1, 155 Mbits, no 8b10b or anything like that so I feel I'm better off with standard IOs than bothering with the serdes)
<gruetzkopf>
sounds interesting, but no
<tnt>
Actually ... looks like the serdes wouldn't even work at 155M, they seem to have a min of 270
<gruetzkopf>
if you need access to one of my bunch of small muxers..
<daveshah>
You can bypass the serdes logic, but that goes straight to fabric so you don't get any DDR/registers etc
<daveshah>
(called LDR/low data rate mode, really meant for very low speed sideband stuff but 155Mbits should be OK)
<tnt>
I would have still hopes to get the normal PIO blocks (mostly because I would have sampled at 2x rate + DDR to do digital clock recovery for RX). But I guess I could just use fabric flip flops with distinct clock phases and lock them to minimize skew.
<gruetzkopf>
have you published the E1 stuff somewhere?
<q3k>
they do mention your names in the article, but i still feel it's not fair that my name is there first :)
<tnt>
Ah tx. But really I just probed a few pins. tbh I don't find those boards all that interesting. Sure they're dirt cheap, but unless your goal is to drive hub75 panels they're not all that practical.
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<tnt>
Any hope of running a risc-v softcore at 155 MHz on an ecp5 ?
<daveshah>
picorv32 on a 5G with a small overclock might manage that - it usually gets 130-140MHz
<tnt>
Not a fan of shipping an overclock in a production system. So I guess not.
<sorear>
do you actually care about mhz, or mips?
<tnt>
Ideally I wanted it synchronous to the rest of the system.
<tnt>
(which is fixed to 155.52 MHz because STM-1)
<tnt>
Is there any faster softcore ?
<tnt>
(potentially not risc-v)
<tnt>
like zpu / lm32 / ... not sure if they synthesize any faster.
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<swetland>
the 75E board is fun in that it's got RGMII PHYs and some SDRAM, which I've wanted to write some verilog to talk to, and then poke at some RISC-V stuff, but agree that the rest of its IO situation leaves much to be desired ^^
<swetland>
the other ECP5 board I have handy being the underwhelming Lattice EVM