[ibis-macro] Re: question on tap parameters in AMI
- From: ckumar@xxxxxxxxxxx
- To: fangyi_rao@xxxxxxxxxxx
- Date: Thu, 11 Feb 2010 10:38:59 -0800
if the model allows for user defined inputs it can be done. Even in this case
the eda tool need not know the details of model type or nature of its
implementation. The whole idea of ami model is, it is a black box.
Quoting fangyi_rao@xxxxxxxxxxx:
> Some customers want the eda tool to optimize these taps and set their
> values in the ami Init call.
>
> Fangyi
>
> -----Original Message-----
> From: ckumar@xxxxxxxxxxx [mailto:ckumar@xxxxxxxxxxx]
> Sent: Thursday, February 11, 2010 10:16 AM
> To: RAO,FANGYI (A-USA,ex1)
> Cc: ambrishv@xxxxxxxxxxx; ibis-macro@xxxxxxxxxxxxx
> Subject: Re: [ibis-macro] Re: question on tap parameters in AMI
>
> why should the eda tool know what type of filter or whatever it is?
>
> As far as the eda tool is concerned the only job it has to do is to pass
> the
> model instances of some arbitrarily named parameters whose values comply
> with
> ami definition.
>
> Quoting fangyi_rao@xxxxxxxxxxx:
>
> > Hi, Ambrish;
> >
> >
> >
> > Thanks for the clarification. In your example a EDA tool will find two
> > groups of tap parameter, RX_FFE_Taps and RX_DFE_Taps in the .ami file
> > based on the parameter type. How does the tool know which group is for
> > FFE and which is for DFE? Note that model specific parameter names can
> > be arbitrary.
> >
> >
> >
> > Fangyi
> >
> >
> >
> > From: ibis-macro-bounce@xxxxxxxxxxxxx
> > [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Ambrish Varma
> > Sent: Wednesday, February 10, 2010 7:57 PM
> > To: ibis-macro@xxxxxxxxxxxxx
> > Subject: [ibis-macro] Re: question on tap parameters in AMI
> >
> >
> >
> > Hi Fangyi,
> >
> > You can give any name to the parameters themselves. For ex,
> >
> > The model_specific section of the RX model with a 5 tap FFE and 3 tap
> > DFE can look like:
> >
> > (Model_Specific
> >
> > (RX_FFE_Taps
> >
> > (-2 (Usage Inout)(Type Tap) (Format Range 0.1 -0.1 0.2)(Default 0.1)
> >
> > (Description "Second Precursor Tap"))
> >
> > (-1 (Usage Inout)(Type Tap) (Format Range 0.2 -0.4 0.4)(Default 0.2)
> >
> > (Description "First Precursor Tap"))
> >
> > (0 (Usage Inout)(Type Tap) (Format Range 1 -1 2)(Default 1)
> >
> > (Description "Main Tap"))
> >
> > (1 (Usage Inout)(Type Tap) (Format Range 0.2 -0.4 0.4)(Default2 0.2)
> >
> > (Description "First Post cursor Tap"))
> >
> > (2 (Usage Inout)(Type Tap) (Format Range 0.1 -0.1 0.2)(Default 0.1)
> >
> > (Description "Second Post cursor Tap"))
> >
> > )
> >
> > (RX_DFE_Taps
> >
> > (-1 (Usage Inout)(Type Tap) (Format Range 0.2 -0.4 0.4)(Default
> 0.2)
> >
> > (Description "First Precursor Tap"))
> >
> > (0 (Usage Inout)(Type Tap) (Format Range 1 -1 2)(Default 1)
> >
> > (Description "Main Tap"))
> >
> > (1 (Usage Inout)(Type Tap) (Format Range 0.2 -0.4 0.4)(Default2
> 0.2)
> >
> > (Description "First Post cursor Tap"))
> >
> > )
> >
> > ) | end model_specific
> >
> >
> >
> > Hope that helps,
> >
> > Ambrish.
> >
> > ________________________________
> >
> > From: ibis-macro-bounce@xxxxxxxxxxxxx
> > [mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of
> > fangyi_rao@xxxxxxxxxxx
> > Sent: Wednesday, February 10, 2010 9:21 PM
> > To: ibis-macro@xxxxxxxxxxxxx
> > Subject: [ibis-macro] question on tap parameters in AMI
> >
> >
> >
> > Hi, Experts;
> >
> >
> >
> > I have a question on tap parameter definition in .ami file. The
> current
> > standard states that:
> >
> >
> >
> > If in addition the individual tap weights are each given a name
> >
> > which is their tap number (i.e., "-1" is the name of the
> >
> > first precursor tap, "0" is the name of the main tap, "1" is
> >
> > the name of the first postcursor tap, etc.) and the tap
> >
> > weights are declared to be of type Tap, then the EDA platform
> >
> > can assume that the individual parameters are tap weights in
> >
> > a tapped delay line
> >
> >
> >
> > This way we have to assume that Tx only has FFE and Rx only has DFE.
> > What if Rx has both FFE and DFE? How can we tell which group of taps
> is
> > FFE and which is for DFE?
> >
> >
> >
> > Thanks in advance.
> >
> >
> >
> > Fangyi
> >
> >
> >
> >
>
>
>
>
>
>
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