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

[bugzilla-daemon at libre-riscv.org]

http://bugs.libre-riscv.org/show_bug.cgi?id=217

--- Comment #20 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
commit dd8ddc307197a406fa0f08f6ac80b16565004fdd
Author: Luke Kenneth Casson Leighton <lkcl at lkcl.net>
Date:   Tue Mar 17 07:37:27 2020 +0000

    reposition add and sub, and do place in the *middle* of alu16

ok try that, jock - but before doing so, have a look at alu16.ap
(if you can)

this is actually a really good illustration of what we need to do.
i'm assuming you didn't get a hard routing completion error, here.

the non-completing of the routing is not jean-paul's problem, it's
ours.

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.

but, we need to get you onto the same page, first.

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