Unknown DRC parameters

[Bastian Koppelmann]

Hi everyone,

I'm trying to port OpenRAM to a new technology and I'm confused what the
meaning of

parameter["min_tx_size"]
parameter["beta"]

is. Can anyone help?

Cheers,

Bastian

[Matthew Guthaus]

Hi Bastian,

Beta is the ratio of PMOS to NMOS size so that they have equal drive/resistance.

min_tx_size is the minimum transistor width. In the example technologies, this is the minimum contacted width to simplify layout and not require "dog bone" type transistors.

Make sure you are updated, I have been making a few updates relating to technology. Some of the were pushed a week or so ago.

Best regards,

Matt

---
Matthew Guthaus
Associate Dean of Graduate Studies
Professor, Computer Science & Engineering
Baskin School of Engineering
University of California Santa Cruz
https://www.soe.ucsc.edu/people/mrg

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[Bastian Koppelmann]

Hi Matt,

On 12/2/19 2:59 PM, Matthew Guthaus wrote:
> Hi Bastian,
>
> Beta is the ratio of PMOS to NMOS size so that they have equal
> drive/resistance.
>
> min_tx_size is the minimum transistor width. In the example technologies,
> this is the minimum contacted width to simplify layout and not require "dog
> bone" type transistors.

Thank you for your quick help. I digged myself and found the answers in
the OpenRAM manual [1]. Maybe it's a good idea to link that in the
README.md.

>
> Make sure you are updated, I have been making a few updates relating to
> technology. Some of the were pushed a week or so ago.

Oh thanks. Yes, I'm on an older version.


Cheers,

Bastian


[1] https://usermanual.wiki/Pdf/openrammanual.518781127/view