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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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