[SI-LIST] Re: SI Simulation post layout
- From: "Hargin, Bill" <bill_hargin@xxxxxxxxxxx>
- To: "'Nitin.Sood@xxxxxxx'" <Nitin.Sood@xxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Wed, 6 Oct 2004 10:47:35 -0700
Hi Nitin:
What PCB layout tool are you guys using? I would concur that HyperLynx isn't a
routing tool, but there might be a feature or two that you're not currently
aware of that would help you ... For example, in HyperLynx (BoardSim, for a
routed or partially routed PCB), you can edit:
- Trace length *
- Trace width
- Routing layer
- Stackup
- Driver/receiver technology
- Termination type and component values
Like I said, it's not a routing tool, but I believe this gives most engineers
the knobs they would want in order to arrive at the best solution for a
specific board or topology.
It could be, too, that the tool you're actually after is HyperLynx LineSim.
You can export a coupled cross section from BoardSim to LineSim, and edit
everything in the pre-layout schematic (where experimentation is more leveraged
... in the sense that you can do it before the board is routed).
Bill Hargin
Product Manager - HyperLynx
Mentor Graphics Corp.
425-497-5079 - Direct
* The process:
1. With your board loaded in HyperLynx BoardSim, select Edit > Unroute Routed
Nets
2. Make a choice from three options: (Unroute) All Nets; Selected Nets;
Selected Nets and Associated Nets
3. After you do this, the net will appear unrouted in the board viewer
4. Select Edit > Connect Nets with Manhattan Routing, grab the nets you want to
connect, select the layers that you want them to be "virtually" routed on,
select a "Manhattan Multiplier" ([X + Y] x Multiplier**), and select the
"Connect Nets" button
5. These nets will appear as rat's nest lines in your board viewer
At this point you can re-simulate based on various lengths.
Edit > Trace width offers similar functionality for experimenting with
different trace widths.
** 1.2 or 1.4 are common multipliers
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Nitin Sood
> Sent: Wednesday, October 06, 2004 10:13 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] SI Simulation post layout
>
>
> Hello,
>
> Is there a tool that would allow me to simulate post layout
> design with
> greater flexibility to analyze nets, edit nets and see its
> effect on the
> integrity of the signal?
>
> Hyper-lynx doesn't allow me to cut nets or stubs and see its
> effect on =
> the
> signal. Every change intended needs to be incorporated in the
> layout and =
> then
> translated into hyper-lynx to be re-simulated.
>
> I appreciate your time and any leads.
>
> Thanks
> Nitin Sood.
>
>
>
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