[ibis-interconn] Re: New keyword [Buffer Rail Mapping]
- From: "Randy Wolff (rrwolff)" <rrwolff@xxxxxxxxxx>
- To: Walter Katz <wkatz@xxxxxxxxxx>, IBIS-Interconnect <ibis-interconn@xxxxxxxxxxxxx>
- Date: Wed, 8 Oct 2014 22:41:02 +0000
Walter,
We certainly (in IBIS) allow buffers to have different power and ground
connections to the driver and the clamps. However, I've never modeled an I/O
that is like this, so maybe someone else can provide an example?
I've modeled devices where the I/Os are designed to work at multiple voltages
(2.5V or 1.8V), but the output driver and clamps are connected to the same rail
(VCCQ). On those same devices, the Address/Command inputs are connected to
VCC, so you could be operating the bus at say 1.8V but the Input's clamps were
connected to 2.5V. In this case, I could still describe the power and ground
connections to the I/O and Inputs with just power_ref and gnd_ref labels.
Randy
From: Walter Katz [mailto:wkatz@xxxxxxxxxx]
Sent: Wednesday, October 08, 2014 4:23 PM
To: Randy Wolff (rrwolff); IBIS-Interconnect
Subject: RE: New keyword [Buffer Rail Mapping]
Randy,
I agree with the changes but why:
Each line must contain either three, five or six entries.
Three entries would be for pulldown_ref, pullup_ref.
Can one have a pulldown_ref and a gnd_clamp_ref and they be different?
Can one have a pullup_ref and a power_clamp_ref and they be different?
Why can we not simplify and have:
Sub-Params: power_ref, gnd_ref, ext_ref
Walter
From: Randy Wolff (rrwolff) [mailto:rrwolff@xxxxxxxxxx]
Sent: Wednesday, October 08, 2014 6:14 PM
To: Walter Katz; IBIS-Interconnect
Subject: RE: New keyword [Buffer Rail Mapping]
Walter,
I made some editorial changes. Let me know if these don't make sense to you.
Thanks,
Randy
From:
ibis-interconn-bounce@xxxxxxxxxxxxx<mailto:ibis-interconn-bounce@xxxxxxxxxxxxx>
[mailto:ibis-interconn-bounce@xxxxxxxxxxxxx] On Behalf Of Walter Katz
Sent: Wednesday, October 08, 2014 2:25 PM
To: IBIS-Interconnect
Subject: [ibis-interconn] New keyword [Buffer Rail Mapping]
All,
This is a new [Buffer Rail Mapping] keyword section.
Walter
Walter Katz
wkatz@xxxxxxxxxx<mailto:wkatz@xxxxxxxxxx>
Phone 303.449-2308
Mobile 303.335-6156
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