Re: [libre-riscv-dev] Pinout, interfaces, Rudi, and Raptor

From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
To: Libre-RISCV General Development <libre-riscv-dev@lists.libre-riscv.org>
Subject: Re: [libre-riscv-dev] Pinout, interfaces, Rudi, and Raptor
Date: Fri, 8 May 2020 16:03:55 +0100
Message-ID: <CAPweEDw7FF9jhAY7Bxvzkj2wPLcaRFtmmgtMy+sCTDbioQG4ow@mail.gmail.com> (raw)
In-Reply-To: <3BD26F5C-BB6D-4011-89E6-EC06215DEDEA@gatech.edu>

On Fri, May 8, 2020 at 3:20 PM Yehowshua <yimmanuel3@gatech.edu> wrote:
>
> Hello Luke,
>         So I see we have some pinout sdefine here.
>
> https://libre-soc.org/shakti/m_class/pinouts/ <https://libre-soc.org/shakti/m_class/pinouts/>
>
>
> My suggestion is to drop the pinmux for now.

it needs writing anyway [not to use Bluespec].  that was *another*
project that took 3 months to do and we can't really use because it's
hard-coded to what the Shakti Team use in IIT Madras.  *sigh*.

> We should probably update that page(or create a similar page) to reflect what we’re targeting for October.

already done https://libre-soc.org/180nm_Oct2020/interfaces/

> IIRC, we’re targeting QFP. I don’t see the dimensions or form factor we’re targeting listed there however. We should talk about that.
>
> Also, talked with Tim and SDR could work for the first SBC.

update interfaces page https://libre-soc.org/180nm_Oct2020/interfaces/?updated

> LiteX also supports SDR which is good for us as it doesn’t require a PHY like DDR making it simpler.

yes.  and it's silicon-proven via the Shakti Team, in their first 22nm
ASIC from 2 years ago.

> Luke, should I connect Rudi to Tim?

hmmm.... in my mind, the roles do not really match up.  they do
however with one of us (by "us" i mean you :) given that i'm trying to
focus on heavily-technical development) as the intermediary

roles:

* Rudi's asked specifically for the interfaces, he'll write a spec as
a PDF and if we say "go" he'll get on with it.
* Tim's role here is as the "customer" plus he's busy.

therefore i suggest:

* *we* need to capture the requirements (of Tim) - by "we" i mean you
* go over them, discuss and approve them (whole team)
* *then* authorise Rudi to go ahead with a design document (i send the message)
* then go over that and discuss and review it (whole team)
* *then* notify Rudi "please go ahead" (i send the message)

l.

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