Mentor v8.6_4 manual ∙ seed

Command Dictionary Add LFSRs

∙seed

A required, right-justified, hexadecimal number, greater than 0, specifying the initial state of the LFSR.

The following lists the three shift_type switches of which you can choose only one.

∙-Both

An optional switch specifying that the LFSR shifts both serially and in parallel. This is the default unless you change it with the Setup LFSRs command.

∙-Serial

An optional switch specifying that the LFSR shifts serially the number of times equal to the length of the longest scan chain for each scan pattern.

∙-Parallel

An optional switch specifying that the LFSR parallel shifts once for each scan pattern.

The following lists the two tap_type switches of which you can only choose one.

∙-Out

An optional switch specifying that the exclusive-OR taps reside outside the register path. This is the default unless you change it with the Setup LFSRs command.

∙-In

An optional switch specifying that the exclusive-OR taps reside in the register path.

Examples

The following example defines an LFSR to be a PRPG and another LFSR to be a MISR:

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

FastScan and FlexTest Reference Manual, V8.6_4 2-77