On 16 Oct 95 at 15:22, [log in to unmask] <[log in to unmask]> wrote:

>      1.) Circuit Routing Programs:
>      I have seen several designs where traces are routed at the minimum 
>      spacing, between two pads, when they could be routed differently to 
>      optimize spacing. These are typically designs with multiple traces 
>      running between pads. It appears the design algorithm will not 
>      automatically jog a single or multiple lines to maximize the spacing.
>      Do effective, reliable, high quality programs exist that could 
>      maximize these types of designs?  Does the design community support 
>      these programs, assuming they exist?  You can guarantee I would notify 
>      the customer and let them review any changes prior to making 
>      implementing any changes.   

Cooper & Chyan's Specctra Router has a DFM utility called "spread" 
that can reposition previously routed traces according to defined clearance values.