Ali,
There are a number of methods to control lengths in the autorouter.
Within your .do file you need to:
1. Define your ITEM (net, group, group set, fromto, class, etc)
2. Decide which type of control you need on the ITEM (you can match lengths
+/- by length units or by ratio) and apply with the circuit command
3. Route the design
4. Report on the results (allows fast identification of anything that
requires adjustment of your .do file to properly resolve)
You can also apply TAX or COST controls to achieve desired results.
I find if the autorouter does not produce desired results it is always
because my .do file hasn't properly defined the directives required.
On Tue, Apr 18, 2017 at 12:57 AM, Ali <dmarc-noreply@xxxxxxxxxxxxx> wrote:
Hi Group,
In Allegro Auto Router pdf document, it is mentioned that length will not
be more than 140% of the Manhattan length (refer to below statement).
*For example, suppose you specify a Minimum. Length of 1.2 and a Maximum
Length of 1.4. The minimum length of the net can be no less*
* than 120% of the Manhattan length. The maximum length of the net can be
no greater than 140% of the Manhattan length.*
I tried one experiment and found that Auto Router routed many nets more
than 140% with no conflicts (I kept Minimum value as -1). I am not sure if
any one saw the same issue or I am doing some thing wrong here. Please
share your thoughts. Thanks for your time.
