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Nexxim Simulator >
Nexxim Component Models >
Probes >
   Eye Probe       

Eye Probe

 

Eye Probe Netlist Format

An Eye probe is inserted in a schematic to perform VerifEye analysis, QuickEye analysis, or Transient analysis in combination with an associated Eye source.

The netlist syntax for the Eye Probe is:

AEYEPROBExxxx n1 [n2] COMPONENT=EYE_PROBE
+ SOURCE_NAME='source_name'
+ DFE_TAPS=val
+ DFE_LOCS=[ locations ]
+ DFE_WEIGHTS=[ weights ]
+ DECISION_HIGH=val
+ DECISION_LOW=val
+ DECISION_THRESHOLD=val
+ CTLE_FIRST_POLE=val
+ CTLE_SECOND_POLE=val
+ CTLE_ZERO=val
+ CTLE_ALLOWED_GAIN=[val ...]

n1 is the node connected to the single-ended probe. n2 is the second node on a differential probe. The Eye probe should connect to the same signal line or lines as the corresponding Eye source without any direct connection to ground. The entry COMPONENT=EYE_PROBE is required.

 


Eye Probe Parameters

Parameter

Description

Unit

Default

SOURCE_NAME

Name of the associated eye source enclosed in quotes

None

None

DFE_TAPS

Number of Decision-Feedback Equalization (DFE) taps

None

0

DFE_LOCS

Bit locations of DFE taps

None

None

DFE_WEIGHTS

DFE weights

None

None

DECISION_HIGH

Decision high value. Set to the expected high level at the receiver after attenuation.

Volt

None

DECISION_LOW

Decision low value. Set to the expected low level at the receiver after attenuation.

Volt

None

DECISION_THRESHOLD

Decision threshold

Volt

Calculated

CTLE_FIRST_POLE

Frequency of first pole in Continuous-Time Linear Equalization (CTLE) transfer function. Setting CTLE_FIRST_POLE enables CTLE.

Hz

None

CTLE_SECOND_POLE

Frequency of second, parasitic pole in CTLE transfer function (optional). Ignored if CTLE_FIRST_POLE is not set.

Hz

None

CTLE_ZERO

Zero frequency, where response begins to rise (optional). Ignored if CTLE_FIRST_POLE is not set.

Hz

None

CTLE_ALLOWED_GAIN

Bracketed list of one or more allowable gain values separated by spaces. If CTLE_ALLOWED_GAIN is not present, Nexxim calculates the optimum gain between -infinity dB and 0 dB (linear values 0 to 1). Ignored if CTLE_FIRST_POLE is not set.

dB

Calculated


 

Eye Probe Netlist Example

AEYEPROBE4 Port1 0 COMPONENT=eye_probe SOURCE_NAME='EYESOURCE1'

For more information on Decision-Feedback Equalization (DFE) and Continuous-Time Linear Equalization, (CTLE) see Quick Eye and VerifEye Technical Notes.




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