# :FUNCtion:PARameters:FFEQualizer:TAPS:AUTO

Linear Equalizer Parameters Commands

- :FUNCtion:PARameters:FFEQualizer:BANDwidth
- :FUNCtion:PARameters:FFEQualizer:BANDwidth:AUTO
- :FUNCtion:PARameters:FFEQualizer:BWMode
- :FUNCtion:PARameters:FFEQualizer:CLKDelay
- :FUNCtion:PARameters:FFEQualizer:DCGain?
- :FUNCtion:PARameters:FFEQualizer:IMPulse
- :FUNCtion:PARameters:FFEQualizer:NPRecursors
- :FUNCtion:PARameters:FFEQualizer:PRESets
- :FUNCtion:PARameters:FFEQualizer:PRESets:SELections?
- :FUNCtion:PARameters:FFEQualizer:STEP
- :FUNCtion:PARameters:FFEQualizer:TAPS
- :FUNCtion:PARameters:FFEQualizer:TAPS:AUTO
- :FUNCtion:PARameters:FFEQualizer:TAPS:COUNt
- :FUNCtion:PARameters:FFEQualizer:TAPS:NORMalize
- :FUNCtion:PARameters:FFEQualizer:TAPS:RECalculate
- :FUNCtion:PARameters:FFEQualizer:TFUNction
- :FUNCtion:PARameters:FFEQualizer:TSPacing
- :FUNCtion:PARameters:FFEQualizer:TSPacing:TIME
- :FUNCtion:PARameters:FFEQualizer:TSPacing:TPUI
- :FUNCtion:PARameters:FFEQualizer:WIDTh

## Command Syntax

    :FUNCtionN:PARameters:FFEQualizer:TAPS:AUTO {OFF | ON}

Where N identifies one of up to 64 possible operators {1:64} that can be defined as part of a math function. The operators are numbered in the order that they were originally added to the function.

## Query Syntax

    :FUNCtionN:PARameters:FFEQualizer:TAPS:AUTO?

## Description

Turns on and off automatic configuration of taps for a Linear Equalizer operator (LFE) (`:FUNCtion:FOPerator`). By default, automatic configuration is on.

OFF
  Disables automatic tap configuration to enable manual entry of tap values. Use the `:FUNCtion:PARameters:FFEQualizer:TAPS` command to enter the individual tap values. Use the `:FUNCtion:PARameters:FFEQualizer:TAPS:NORMalize` command to automatically adjust the tap values for a maximum equalizer gain of 0 dB (unity). The relative contributions of the tap values are maintained. Use the `:FUNCtion:PARameters:FFEQualizer:TSPacing` command to select tap spacing based on taps-per-bit or seconds.
ON
  Enables automatic tap configuration. Use the `:FUNCtion:PARameters:FFEQualizer:NPRecursors` command to specify the precursors used for automatic configuration. To enter the number of taps, use the `:FUNCtion:PARameters:FFEQualizer:TAPS:AUTO` command. Automatic tap configuration sets the optimum tap values to open an eye diagram, but requires that you use a PRBS pattern that has a length that is listed in the following table. Inverted PRBS patterns are also supported. The table also lists the generating polynomials. You cannot specify a tap spacing based on time in automatic tap configuration mode. Use the `:FUNCtion:PARameters:FFEQualizer:TAPS:RECalculate` command to automatically recalculate the tap values.

PRBS Patterns for Optimum Tap Values
PRBS | Polynomial | PRBS | Polynomial
--- | --- | --- | ---
25−1 | x5+x4+x2+x1+1 | 211−1 | x11+x9+1
26−1 | x6+x5+x3+x2+1 | 212−1 | x12+x9+x8+x5+1
27−1 | x7+x6+1 | 213−1 | x13+x12+x10+x9+1
28−1 | x8+x7+x3+x2+1 | 214−1 | x14+x13+x10+x9+1
29−1 | x9+x5+1 | 215−1 | x15+x14+1
210−1 | x10+x7+1 |  |

## Example Command Sequence

    :FUNCtion2:FOPerator FFEQualizer
    :FUNCtion2:PARameters:FFEQualizer:TAPS:AUTO ON;*OPC?
    :FUNCtion2:PARameters:FFEQualizer:TAPS:COUNt 5;*OPC?
    :FUNCtion2:PARameters:FFEQualizer:NPRecursors 3
    :FUNCtion2:PARameters:FFEQualizer:BANDwidth:AUTO OFF
    :FUNCtion2:PARameters:FFEQualizer:BANDwidth 8.0E9
    :FUNCtion2:COLor TCOLor4
    :FUNCtion2:DISPlay ON
    *OPC?
    …  //  Your code to synchronize execution timing.

## Parent Command

- `:FUNCtion:PARameters:FFEQualizer:TAPS`