All,
This e-mail is a summary of applying IBIS-ISS to IBIS package modeling for
IBIS 6.0. This summary is based on discussions in IBIS-ATM, and private
communications with Brad Brim, Arpad Muranyi, Michael Mirmak and various
IC Vendors.
Definitions:
Pin The connection point of a package model to a
board.
Pad The connection point of a package model to the
die.
Channel Either a single ended connection between a single
Pin and a single Pad, or a differential connection between two Pins and
two Pads.
Finally, I will describe the package modeling solution for several Levels
of package model complexity.
Level 1
Package models for a single Channel without coupling to either Power or
other Channels.
Useful to have multiple Channels point to the same IBIS-ISS subckt,
passing a unique Length for each Channel.
Important to have more than 3 corners.
Level 2
Package models for a single Victim Channel with coupling to other
Aggressor Channels in the same bus but without coupling to Power.
Useful to have multiple Channels point to the same IBIS-ISS subckt,
passing a unique Length for each Channel.
This assumes that the Aggressor Channels have the same length as the
Channel.
Important to have more than 3 corners.
Level 3
Package models for a multiple Channels with coupling between them but
without coupling to Power.
Channels may be in multiple buses
Package model may be for complete package or for a slice of the package..
Level 4
Package models for Power and Ground.
No coupling to Channels.
May require multiple Pads for the Power and Ground Nodes.
In general there will be a different number of Pads and Pins
Level 5
Package models for a multiple Channels, Power and Ground with coupling
between Channels and between Channel and Power.
Channels may be in multiple buses.
Package model may be for complete package or for a slice of the package.
Recommendations:
I recommend that IBIS 6.0 should fully address Level 1 and Level 2 for the
following reasons:
IBIS has sufficient resource to accomplish this task.
Gives package information to Users/EDA tools to enable users to make
engineering decisions.
Is in accordance with many industry standards package model
specifications.
I recommend that IBIS 6.0 should be enhanced to enable EDA tools to uses
Level 3, 4 and 5 models that publish their connections ports with
something like MCP.
Walter
Walter Katz
<mailto:wkatz@sisoft.com> wkatz@sisoft.com
Phone 303.449-2308
Mobile 303.335-6156
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Received on Thu Jul 19 09:19:55 2012
This archive was generated by hypermail 2.1.8 : Thu Jul 19 2012 - 09:20:37 PDT