[ibis-macro] Re: question on tap parameters in AMI
- From: "Walter Katz" <wkatz@xxxxxxxxxx>
- To: <fangyi_rao@xxxxxxxxxxx>, <ambrishv@xxxxxxxxxxx>, <ibis-macro@xxxxxxxxxxxxx>
- Date: Thu, 11 Feb 2010 13:06:00 -0500
Fangyi,
The EDA Vendor of the model may not want you to know what type of tap it is,
and the EDA Tool does not need to know.
Walter
Walter Katz
303.449-2308
Mobile 720.333-1107
wkatz@xxxxxxxxxx
www.sisoft.com
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx]On Behalf Of fangyi_rao@xxxxxxxxxxx
Sent: Thursday, February 11, 2010 12:47 PM
To: ambrishv@xxxxxxxxxxx; ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Re: question on tap parameters in AMI
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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