Mentor v8.6_4 manual Add Lfsr Taps, ADD LFsr Taps lfsrname position

Add LFSR Taps Command Dictionary

Add LFSR Taps

Tools Supported: FastScan

Scope: Setup mode

Usage

ADD LFsr Taps lfsr_name position...

Description

Adds the tap configuration to a Linear Feedback Shift Register (LFSR).

The Add LFSR Taps command sets the tap configuration of an LFSR. LFSR bit positions have integer numbers, where 0 indicates the least significant bit position. FastScan assumes the output of the 0 bit position connects to the selected tap points and that the 0 bit position cannot itself be a tap point.

You can use the Report LFSRs command to display all the LFSRs with their current values and tap positions. You can change the default setting of the tap_type switches by using the Setup LFSRs command.

You use this command primarily for simulating Built-In Self Test (BIST) circuitry.

Arguments

∙lfsr_name

A required string that specifies the name of the LFSR on which you want to place the taps.

∙position

A required repeatable integer that specifies the bit positions of the lfsr_name at whose outputs you wish to place the taps.

Examples

The following example places taps on the newly added LFSRs:

add lfsrs lfsr1 prpg 5 10 -serial -in add lfsrs misr1 misr 5 15 -both -out add lfsr taps lfsr1 1 3

add lfsr taps misr1 1 2

2-74 FastScan and FlexTest Reference Manual, V8.6_4