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

Eye Source

 

Eye Source Netlist Format

An eye source is inserted in a schematic to perform VerifEye analysis, QuickEye analysis, or Transient analysis.

The netlist syntax for the Eye Source is:

AEYESOURCExxxx n1 [n2] COMPONENT=EYE_SOURCE
+ RESISTANCE=val
+ BITLIST=#bitlist
+ BITFILE='file-reference'
+ RANDOM_BIT_COUNT=val REPEAT_COUNT=val RANDOM_SEED=val
+ VLOW=val VHIGH=val TRISE=val
+ UI=val BPS=val
+ STEP_RESP_NUM_UI=val
+ DCD=val TXRJ=[val ...] TXPJ=[val ...] TXUJ=[val ...]
+ TXCJ='file-reference'
+ FFE_TAPS=val
+ FFE_LOCS=[ locations ]
+ FFE_WEIGHTS=[ weights ]
+ NORMALIZE_FFE=val
+ FFE_COMPUTE_PROBE='probe_name'
+ PHASE_DELAY=val
+ PRBS_NO=val
+ PRBS_SEED=val
+ PRBS_INVERT=val
+ PRBS_BITLENGTH=val
+ DO_ENCODING=val
+ HOLD_LAST_BIT=val
+ FFE_FILE='file-reference' // Netlist Only

n1 is the node connected to the single-ended source. n2 is the second node on a differential source. The differential Eye source must be connected to two signal lines. Neither node should be directly grounded. See Notes below for details. The entry COMPONENT=EYE_SOURCE is required.

 


Eye Source Parameters

Parameter

Description

Unit

Default

RESISTANCE

Impedance added in series with Eye Source

Ohm

50

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

 

VHIGH

Logic high voltage level

Volt

 

TRISE

Low-to-high rise time and high-to-low fall time

Second

 

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

None

DCD

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

None

0

TXRJ

List of transmit random jitter values (standard deviations) enclosed in brackets

Second

0

TXPJ

List of transmit periodic random jitter values (amplitudes) enclosed in brackets

Second

0

TXUJ

List of transmit uniform random jitter values (amplitudes) enclosed in brackets

Second

0

TXCJ

File containing jitter probability density function data. Two-column data specifies times in seconds and corresponding PDF values separated by spaces.

None

None

FFE_TAPS

Number of FFE taps

None

0

FFE_LOCS

Bit locations of FFE taps

None

None

FFE_WEIGHTS

FFE weights

None

None

NORMALIZE_FFE

1=Normalize, 0=No normalization

None

 

FFE_COMPUTE_PROBE

Name of the associated eye probe

None

None

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

FFE_FILE

Netlist Only. Used when there are technical limitations on the values that tap weights can take. References a file with a list of allowable FFE weights, one per line, in order from most negative to most positive. When FFE_FILE is present, the FFE algorithm optimizes using only tap weights from the list. As with the standard algorithm, the sum of the absolute values of the weights used is never greater than one.

None

None


 

Eye Source Netlist Example

AEYESOURCE3 Port1 COMPONENT=EYE_SOURCE RESISTANCE=50
+ BITLIST=#1010101010100000111110101010101000001111
+ REPEAT_COUNT=1000

Notes

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

The internal voltage source amplitude is set by VHIGH and VLOW. The source is grounded internally. The series resistance is set by the RESISTANCE parameter.

2. The Differential Eye 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 Eye source connects to a signal line. The line should not be directly grounded. The corresponding Eye probe should also connect to the signal line without any direct ground connection.

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

5. For more information on the Eye Source equalization and jitter parameters, see Quick Eye and VerifEye Technical Notes.

 




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