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Nexxim Simulator >
Nexxim Component Models >
Independent Sources >
   AMI Source       

AMI Source

 

 

Note 

The AMI source is created via the AMI model import wizard. See IBIS AMI Model Support in the Nexxim topic.

AMI Source Netlist Format

An AMI source is required for IBIS Application Modeling Interface Analysis. Single-ended and differential versions are available.

The netlist syntax for the AMI Source is:

AAMISOURCExxxx n1 [n2] COMPONENT=AMI_SOURCE
+ LIBRARY='file-reference'
+ PARAMETERS_FILE='file-reference'
+ PROBE_NAME='name'
+ BITLIST=#bitlist
+ BITFILE='file-reference'
+ RANDOM_BIT_COUNT=val REPEAT_COUNT=val RANDOM_SEED=val
+ VLOW=val VHIGH=val TRISE=val TFALL=val
+ PHASE_DELAY=val
+ UI=val BPS=val
+ STEP_RESP_NUM_UI=val
+ DCD=val TXRJ=val TXPJ=val TXUJ=val
+ PRBS_NO=val
+ PRBS_SEED=val
+ PRBS_INVERT=val
+ PRBS_BITLENGTH=val
+ DO_ENCODING=val
+ HOLD_LAST_BIT=val
+ DELAY=val

n1 is the node connected to the single-ended source. n1 and n2 are the positive and negative nodes connected to the differential source. The differential AMI source must be connected between two signal lines. Neither node should be directly grounded. See Notes below for details. The entry COMPONENT=AMI_SOURCE is required.

 


AMI Source Parameters

Parameter

Description

Unit

Default

LIBRARY

AMI shared library file

None

None

PARAMETERS_FILE

AMI parameters file

None

None

PROBE_NAME

Name of the AMI probe that is the primary receiver on the channelwith this source (other AMI Sources and Probes are treated as crosstalk.)

None

None

BITLIST

Sequence of ones and zeros

None

None

BITFILE

File containing bit list

None

None

RANDOM_BIT_COUNT

Number of random bits to generate

None

0

REPEAT_COUNT

Number of times to repeat the random bit pattern. Total bits = (N+1)*RANDOM_BIT_COUNT

None

0

RANDOM_SEED

Seed for RANDOM_BIT_COUNT

None

None

VLOW

Logic low voltage level

Volt

0

VHIGH

Logic high voltage level

Volt

1

TRISE

Low-to-high rise time

Second

1e-10

TFALL

High-to-low fall time

Second

TRISE

BPS

Bit rate for the source

1/Second

None

UI

Duration of the unit interval. When both UI and BPS are given, UI is used.

Second

1e-9

DCD

Duty cycle distortion (Fraction of UI,
0 < DCD < 1)

None

0

TXRJ

Transmit Gaussian random jitter (standard deviation)

Second

0

TXPJ

Transmit periodic random jitter (amplitude)

Second

0

TXUJ

Transmit uniform random jitter (amplitude)

Second

0

PHASE_DELAY

Phase delay of the source

Second

0.0

STEP_RESP_NUM_UI

Number of unit intervals to run step response from

None

 

PRBS_NO

Size of pseudorandom bit pattern. May be any integer from 2 to 31. Nexxim randomly runs through all combinations of that many bits.

None

 

PRBS_SEED

Random seed for pseudorandom bit pattern

None

0

PRBS_INVERT

1=invert pseudorandom bit output,

0=no inversion

None

0

PRBS_BITLENGTH

Total number of PRBS bits to generate

None

2^PRBS_NO

HOLD_LAST_BIT

Controls behavior when end of bitstream occurs before simulaition ends

1=hold last bit of sequence

0=repeat sequence

This control is added to REPEAT_BIT_COUNT to cover the case where this source is the aggressor and the victim source has a longer bit list than the aggressor’s.

None

0

DO_ENCODING

1=perform 8b10b encoding
0=no encoding

None

0

DELAY

Delay offset for transition

Second

0


 

AMI Source Netlist Example

AAMISOURCE3 Port1 Port2 COMPONENT=AMI_SOURCE
+ LIBRARY='AMI_library_1'
+ PARAMETERS_FILE='Project1_parameters'
+ BITLIST=#1010101010100000111110101010101000001111
+ REPEAT_COUNT=1000

To run examples of AMI analysis, see AMI Analysis Example in the Getting Started Guide.

Notes

1. The Single-Ended AMI source has the generalized internal structure below:

The internal voltage source amplitude is set by VHIGH and VLOW. The source is grounded internally.

2. The Differential AMI source has the generalized internal structure below:

Each of the two nodes is driven with half the voltage amplitude of the single-ended source and opposite polarity. The output is symmetrical in that the average of the two outputs is close to zero. The series resistance is also divided equally between the two nodes. Both sources are internally grounded.

3. The Single-Ended AMI source connects to a signal line. The line should not be directly grounded. The corresponding AMI probe should connect to the same signal line without any direct ground connection.

4. The Differential AMI source connects to two signal lines. Neither node should be grounded. The corresponding Differential AMI probe should connect to the same two signal lines without direct grounding.

 




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