Interface Element problems

Hello,

I am new to the mixed signal environment (spectreVerilog, verilog-XL) and am
having problems where, when I set the IE to a specific low and high
threshold. (schematic editor -> mixed signal -> Interface
Elements ->library), the changes are "selectively" made in the netlist.
That is, not all of the vl and vh values are set properly. I know this
because a quick search for "vl=" and "vh=" in the netlist shows older
default values.

What could be wrong and how might I go about fixing this?

Thanks so much.
Sam

 

Hi

I think the Mixed signal interface is associate to the Lib. If you have test
circuit is in lib A and your cell is in lib B, the mixed signal interface in
lib A will be update but not for the cell in lib B.
You can look at the property of each library, it will show the property of
the default mixed signal interface.
You can not change the a2d and d2a in analog lib. It is better that you copy
them localy then play with it.

good luck

 

In fact the interface element can be set for a particular library (or cell,
if my memory serves me). However, you can also set the default interface
element used (defaults to analogLib/MOS_a2d and MOS_d2a I think).

What I usually recommend is copying these cells from analogLib into a local
library, changing the CDF defaults for them, and then setting this as
the default IE pair for the design. That way it will affect all elements
in the design, unless overridden. Otherwise you need to set the
properties for all libraries, which is more awkward.

I probably didn't explain this that clearly, hope it's OK...

Andrew.