[Libre-soc-dev] Gigabit Router Pinmux Considerations
andrey at technepisteme.xyz
Thu Nov 4 14:07:24 GMT 2021
Yesterday after the chat I did a quick draft of the pinmux page for the
I only included an estimate for the required number of pins (before any
muxing). While writing this email actually answered a lot of my
questions and updated the pin counts hahaha
The page is also linked to main crypto router page:
Currently checking the pins required for various interfaces (which I'll
add to the wiki page once I create class for the router ASIC).
Here are some questions that I have:
- Why was does the RGMII interface we use require 20 pins? - Last night
I found a 12 pin version where some of the extra signals are encoded
using the data lines (perhaps our PHY doesn't support this, see Section
- Is the SDRAM1 interface the same as the one used in LS180?.
- Which package is going to be used for the router ASIC? - During the
meeting I heard QFP, but the pincount was not specified.
- Are all the interfaces mentioned in the crypto router page required? -
I have not included PWM in my calculations. PWM might be handy for LEDs
(that's where I've usually seen them used for).
Should I also put this under a new bug somewhere?
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