FreeLists / si-list / [SI-LIST] Re: HSpice IBIS Input/Output Buffer syntax

[Adam.Tambone@xxxxxxxxxxxxxxxxx]

Patrick,

I'm not exactly sure but I believe your voltage level on nd_en must meet
the threshold levels specified by Vinh and Vinl.  Regardless, I usually
consider Vcc to be high and gnd to be low.

Adam Tambone






Patrick_Carrier@xxxxxxxx on 08/03/2001 11:35:51 AM

To:   Adam Tambone/SouthPortland/Fairchild@Fairchild,
      Patrick_Carrier@xxxxxxxx
cc:   si-list@xxxxxxxxxxxxx

Subject:  RE: [SI-LIST] Re: HSpice IBIS Input/Output Buffer syntax


Adam--
Thanks for your help.  Could you clarify:
What is the "appropriate voltage" on nd_en?  Is it 1V for enable and 0V for
disable?


-----Original Message-----
From: Adam.Tambone@xxxxxxxxxxxxxxxxx
[mailto:Adam.Tambone@xxxxxxxxxxxxxxxxx]
Sent: Friday, August 03, 2001 10:27 AM
To: Patrick_Carrier@xxxxxxxxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: HSpice IBIS Input/Output Buffer syntax




Patrick,

For I/O buffers used as input buffers connect the 'signal in' to nd_out,
tie nd_in to ground via a 0V voltage source, and put the buffer in the
disable state with the appropriate voltage on nd_en.

For I/O buffers used as output buffers connect 'signal in' to nd_in, and
put the buffer in the enable state with the appropriate voltage on nd_en.

If you are connecting these buffers as drivers and receivers, connect the
transmission line to the output buffer at nd_out and connect it to the
input buffer at nd_out also.

Adam Tambone






Patrick_Carrier@xxxxxxxx@freelists.org on 08/03/2001 11:13:17 AM

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Subject:  [SI-LIST] HSpice IBIS Input/Output Buffer syntax



I'm assuming someone out there has used an Ibis I/O buffer in HSpice.
I was hoping you could clarify something for me:
For an input buffer, the node which connects to the circuit is nd_in, which
receives the signal sent to the buffer.
For an output buffer, the node which connects to the circuit is nd_out,
which sends a signal to the rest of the circuit.  The output of this node
is
controlled by nd_in, which is where you connect your pulse voltage source
or
whatever other stimulus you would like.
For an input/output buffer, there is another node called nd_en, to which
you
must also attach a voltage source.  What is this node for?
It stands to reason that nd_out is what is connected to the rest of the
circuit, which acts as both an input and an output, depending on the state
of the buffer, and that nd_in is where you connect your stimulus when the
buffer is acting as an output buffer, but what about nd_en?  Does this node
get the same stimulus as nd_in?  Does it just get a 1 or a 0 dependent upon
the state of the buffer?
I would appreciate any input.   Thanks.

Patrick Carrier
Simulation Engineer - Signal Integrity Group
Dell Computer Corporation
Patrick_Carrier@xxxxxxxx
(512)723-4910

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