[ibis-macro] Clock Forwarding Bird Issue

From: Walter Katz <wkatz@xxxxxxxxxx>
To: "'IBIS-ATM'" <ibis-macro@xxxxxxxxxxxxx>
Date: Tue, 15 Dec 2020 09:57:27 -0500 (EST)

All,

I would like to comment on the following situation with the Clock
Forwarding Bird (204)

1.      If the Data DLL has "Rx_Use_Clock_Input "Times")
2.      The Clock has a DLL that either

a.      GetWave_Exist=True and GetWave does not return clock ticks
b.      GetWave_Exist False

3.      This is problematic for two reasons:

a.      The EDA tool does not know until simulation time if GetWave does
not return clock ticks when GetWave_Exist=True
b.      If the model make goes through all of the effort of creating a
Data DLL that accepts clock ticks, he should not rely on the EDA tool to
generate clock ticks from a DQS waveform.

I would therefore propose the following change to BIRD204, to replace the
following line:

For "Times" and "Wave" options, if the Clock does not have a DLL or has a
DLL without an AMI_GetWave, then the EDA tool should effectively insert a
passthrough Clock AMI_GetWave function to create the wave or clock_times
output vector required by the Data AMI_GetWave clock_times input.

With

For the "Wave" option, if the Clock does not have a DLL or has a DLL
without an AMI_GetWave, then the EDA tool should effectively insert a
passthrough Clock AMI_GetWave function to create the wave output vector
required by the Data AMI_GetWave clock_times input.

For the "Time" option, the Clock shall have a DLL with an AMI_GetWave that
returns clock_times.

Walter

Walter Katz

Work  508.647-7633

Cell      720.417-3762

Follow-Ups:
- [ibis-macro] Re: Clock Forwarding Bird Issue
  - From: Muranyi, Arpad

[ibis-macro] Clock Forwarding Bird Issue

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