[libre-riscv-dev] [Bug 217] create a "ring" system which allows pad locations to be specified conveniently

bugzilla-daemon at libre-riscv.org bugzilla-daemon at libre-riscv.org
Tue Mar 17 13:04:56 GMT 2020


--- Comment #21 from Jock Tanner <tanner.of.kha at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #20)
> ok try that, jock - but before doing so, have a look at alu16.ap
> (if you can)

I dug up this:


and I looked at the file knowing approximately what kind of problem it solves.
Still the file is huge and I don't think I can debug the code just by looking
at it. I just wonder how many 'I' records it has. Shouldn't it be like 3
instances? Or is this because each bit slice counts?

> the placement of the cells all over the large area (1100 x 700)
> meant that when it comes to routing, it is a total mess.
> what i've done is: limited the "placement" box for the remaining
> (little) components - Cells - of alu16 to be in the MIDDLE.
> *between* add and sub.
> then, the auto-router can not only successfully connect those up,
> it has room to connect to add and sub as well.
> now, it turns out that if you move add and sub down by even 25 units,
> *there is not enough room to add the tracks* connecting them to the
> outside world.

I pulled your changes and did only

  make clean
  make lvx
  cgt --script=doAlu16

Still I got exactly the same error as before. And the picture is just a quarter
of the 'make view' picture size.

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