Time: Tuesday, July 18, 2017 at Noon US Pacific Time
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WebEx:
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Agenda
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1) Opens
2) Roll call
3) Review of ARs:
Arpad: Email BIRD158.6_draft1 and comments to Radek to the ATM reflector
- done
Any other AR-s?
4) Call for any IBIS related patent disclosures
5) Approval of minutes
6) Motions from Walter:
Motion 1:
Do you agree that a redriver channel with Tx1, Rx1, Tx2 and Rx2 being Init-Only
models:
1. IBIS 6.1 Redriver Flow gives the wrong answer.
2. BIRD 166 gives the right answer.
Motion 2:
Do you agree that a redriver channel with Tx1, Rx1, Tx2 and Rx2 being Dual
models:
1. IBIS 6.1 Redriver Flow may give the wrong time domain answer.
2. BIRD 166 gives the right answer
Motion 3:
Do you agree that a redriver channel with Tx1, Rx1, Tx2 and Rx2 being Dual
models:
1. IBIS 6.1 Redriver Flow gives the wrong statistical answer.
BIRD 166 gives the right answer
Reasons:
Motion 1:
1. In order for Rx2 to generate the correct DFE taps and other equalization,
it requires the combined IR of all upstream channels and model equalizations.
In the IBIS 6.1 Redriver Flow the Upstream Channel IR is not included in the IR
input to Rx2.
2. In IBIS 6.1 Redriver flow, the IR of the upstream channel when applied to
the output of Rx2 incorrectly scales the DFE equalization of Rx2.
Motion 2:
1. The IBIS 6.1 Redriver Flow gives the incorrect flow If the Rx2 GetWave
equalization requires that the Rx2 AMI_Init IR contains the IR equalization of
all of the upstream channels and model equalizations.
7) BIRD190 (Ambrish)
8) BIRD191 (All)
9) Buffer impedance / C_comp improvements (Randy)
- discussion
10) BIRD191 Adding Buffer Location to Si_location and
Timing_location (Bob R.)
- discussion
11) BIRD158.6 AMI Touchstone Analog Buffer Models (Katz et al)
- waiting for Radek's new revision (waiting for 186)
- discussion
12) Single ended applications of algorithmic modeling (All)
- do we need to make any changes in the spec?
- we need Fangyi's presence to discuss his concerns
- discussion
a) single ended filter needs different algorithms
EQ effecting Vref
b) rise/fall may be asymmetric
gets worse at higher data rate
c) loss of information when using difference signals only
13) New BIRDs from Editorial Task Group? (Bob/Radek)
a. Specify buffer reference terminals for pins ([Pin Reference])
b. Simulation (aka DIA) vs. DUT (depends on #a)
c. C_comp and package reference in simulation clarifications
(depends on #a)
d. Make changes to the [Receiver Threshold], once a. and b. are resolved
Tabled topics:
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14) BIRD166 (Walter)
15) BIRD161.2 Supporting Incomplete and Buffer-only
[Component] Descriptions (Mike M.)
- introduction of new draft
- discussion
16) Fangyi's Redriver flow BIRD draft (Fangyi)
- add equations
- consider rewriting the AMI "front end" in the spec (flows)
(when this proposal is added to the spec)
17) How to handle missing min/max data? (Arpad)
- what should be the governing rule for synchronizing
typ/min/max data?
Pending BIRDs, expected to be rejected:
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125.1 Make IBIS-ISS Available for IBIS Package Modeling
145.3 Cascading IBIS I/O buffers with [External Circuit]s using the [Model
Call] keyword
163 Instantiating and Connecting [External Circuit] Package Models with
[Circuit Call]
164 Allowing Package Models to be defined in [External Circuit]
Pending BIRDs, expected to be accepted (currently in discussion):
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158.5 AMI Touchstonefile (R) Analog Buffer Models
181.1 I/V Table Clarifications
186.3 File Naming Rules
189.4 Interconnect Modeling Using IBIS-ISS and Touchstone
TBD New proposal for Redriver Flow (may replace BIRD166)
TBD C_comp modeling with IBIS-ISS
Pending BIRDs awaiting discussion:
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161.2 Supporting Incomplete and Buffer-only [Component] Descriptions
166.3 Resolving problems with Redriver Init Flow
165 Parameter Passing Improvements for [External Circuit]s
190 Clarification for Redriver Flow
Thanks,
Arpad
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