My understanding is that A_gnd is the same thing as node0, GND, GND! and
all of its synonyms. So with that in mind, I don't see why someone would
use A_gnd on a terminal line if that subcircuit terminal is also grounded from
the inside of the subcircuit...
Thanks,
Arpad
=============================================================
From: ibis-interconn-bounce@xxxxxxxxxxxxx
[mailto:ibis-interconn-bounce@xxxxxxxxxxxxx] On Behalf Of Bob Ross
Sent: Monday, January 15, 2018 2:22 PM
To: ibis-interconn@xxxxxxxxxxxxx
Cc: 'IBIS-ATM' <ibis-macro@xxxxxxxxxxxxx>
Subject: [ibis-interconn] Re: IBIS Interconnect BIRD - A_gnd Examples for
IBIS-ISS
Arpad,
You raise some good points.
Do we assume that if a (global) node 0 is used in a .iss, it is automatically
connected to the similar node 0?
(So we do not need Example 14.)
Bob
From:
ibis-interconn-bounce@xxxxxxxxxxxxx<mailto:ibis-interconn-bounce@xxxxxxxxxxxxx>
[mailto:ibis-interconn-bounce@xxxxxxxxxxxxx] On Behalf Of Muranyi, Arpad
Sent: Monday, January 15, 2018 11:22 AM
To: ibis-interconn@xxxxxxxxxxxxx<mailto:ibis-interconn@xxxxxxxxxxxxx>
Cc: IBIS-ATM
Subject: [ibis-interconn] Re: IBIS Interconnect BIRD - A_gnd Examples for
IBIS-ISS
Bob,
Thanks for the examples. I wonder about Example 14. What is the purpose of
having a subcircuit definition terminal connected to node0 on the outside (on
the terminal line) when it is also connected to node0 on the inside of the
subcircuit? By the way, since we can't have a .connect statement inside the
subcircuit, the only way to do that would be by using a 0V DC source or a small
value resistor. But an ideal source will most likely end up with a "Voltage
source,
inductor loop" error message, so the only option is a small valued resistor.
But
why would someone want to do that?
Maybe I don't understand it, but I think we could remove Example 14...
Thanks,
Arpad
================================================================
From:
ibis-interconn-bounce@xxxxxxxxxxxxx<mailto:ibis-interconn-bounce@xxxxxxxxxxxxx>
[mailto:ibis-interconn-bounce@xxxxxxxxxxxxx] On Behalf Of Bob Ross
Sent: Monday, January 15, 2018 1:04 PM
To: ibis-interconn@xxxxxxxxxxxxx<mailto:ibis-interconn@xxxxxxxxxxxxx>
Cc: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx<mailto:ibis-macro@xxxxxxxxxxxxx>>
Subject: [ibis-interconn] IBIS Interconnect BIRD - A_gnd Examples for IBIS-ISS
All,
Attached are two examples and related text in BIRD189_draft15_v6.
I want to check if my interpretation is correct on these points that are also
mentioned in BIRD189.
- A_gnd can be used to short I/O nodes to ground at several terminal
lines (Example 13)
- A new node on the .subckt line can be created that shorts to an
internal node 0 (since we do not allow "0" to be a node name (Example 14).
Node 0 is global and does not have to be exposed.
- No example is shown for File_TS since the rule is clear that only
the N+1 terminal line can optionally have A_gnd as a reference
Also, we should use lower case "node 0" in BIRD189.
Bob
--
Bob Ross
Teraspeed Labs
www.teraspeedlabs.com<http://www.teraspeedlabs.com/>
bob@xxxxxxxxxxxxxxxxx<mailto:bob@xxxxxxxxxxxxxxxxx>
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