Mentor v8.6_4 - page 105

Command Dictionary Add LFSRs
FastScan and FlexTest Reference Manual, V8.6_4 2-77
•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