IBIS FUTURES COMMITTEE MULTILINGUAL MODEL: DIGITAL …

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Transcript IBIS FUTURES COMMITTEE MULTILINGUAL MODEL: DIGITAL …

IBIS FUTURES COMMITTEE
MULTILINGUAL MODEL:
DIGITAL PORT ISSUES
Ian Dodd
25th March 2004
Digital Multilingual Ports

Standard Digital Ports:
—
Inputs


—
D_enable
D_drive
Outputs

D_receive
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ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential
Digital Port Type Concerns


VHDL-AMS and Verilog-AMS port types must
match exactly between the SI tools top level circuit
and user multilingual model.
It is assumed we will ensure this by requiring
model providers to use standard port types:
—
—
—
It is assumed the reference to IEEE Std_logic_1164
enforces one (9 state) digital port type for VHDLAMS
We need to specify something equivalent for VerilogAMS digital ports
Do we need to also specify port type/nature for
analog ports.
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ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential
Allowed Digital Logic Levels

Propose we limit the logic states that are
legal for the standard digital ports:
—
Inputs

—
VHDL-AMS ‘1’, ‘0’ or Verilog-AMS equivalent
Outputs

VHDL-AMS ‘1’, ‘X’, ‘0’ or Verilog-AMS
equivalent
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ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential
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ICD, Multiligual Model: Digital Port Issues, 25th March 2004 Non Company Confidential