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Ansoft Designer / Ansys Designer 在线帮助文档:


Nexxim Simulator >
VerifEye and QuickEye Analyses >
   Running QuickEye Analysis from the Netlist Editor >
       QuickEye Source Netlist Syntax           


QuickEye Source Netlist Syntax

The netlist syntax for the QuickEye Source is:

AEYESOURCExxxx n1 [n2] COMPONENT=EYE_SOURCE
+ VLOW=val VHIGH=val TRISE=val TFALL=val
+ UI=val BPS=val
+ STEP_RESP_NUM_UI=val
+ DCD=val TXRJ=[val ...] TXPJ=[val ...] TXUJ=[val ...]
+ TXCJ='filename'
+ FFE_LOCS=[ locations ]
+ FFE_WEIGHTS=[ weights ]
+ NORMALIZE_FFE=val
+ FFE_COMPUTE_PROBE='probe_name'
+ RESISTANCE=val
+ BITLIST=#bitlist
+ BITFILE='file-reference'
+ RANDOM_BIT_COUNT=val REPEAT_COUNT=val RANDOM_SEED=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. n2 is the second node on a differential source. One of the entries BITLIST, BITFILE, RANDOM_BIT_COUNT, or PRBS_NO must be specified. The entry COMPONENT=EYE_SOURCE is required.

Note 

The Eye sources are internally grounded. All terminals should be connected to signal lines, not directly to ground.

 


QuickEye Source Parameters

Parameter

Description

Unit

Default

RESISTANCE

Impedance added in series with Eye Source

Ohm

50

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

Second

 

TFALL

High-to-low fall time

Second

 

BPS

Bit rate for the source

1/Second

None

UI

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

Second

None

DCD

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

Second

 

TXRJ

Transmit Gaussian random jitter (standard deviation). List of values enclosed in brackets.

Second

 

TXPJ

Transmit Periodic random jitter (amplitude). List of values enclosed in brackets.

Second

 

TXUJ

Transmit Uniform random jitter (amplitude). List of values enclosed in brackets.

Second

 

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 (sum of absolute values of all weights equals one)

0=No normalization

None

1

FFE_COMPUTE_PROBE

Name of the associated eye probe for FFE

None

None

STEP_RESP_NUM_UI

Number of unit intervals to run step response from

None

 

DELAY

Delay offset for transition

Second

0

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

PRBS_NO

Size of pseudorandom bit pattern. Integer from 2 to 31. Nexxim randomly runs through all combinations of that many bits.

None

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


Here is an example of a netlist entry for an Eye Source:

AEYESOURCE3 Node1 COMPONENT=EYE_SOURCE RESISTANCE=50
+ BITLIST=#1010101010100000111110101010101000001111
+ REPEAT_COUNT=1e6




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