Mentor v8.6_4 Benutzerhandbuch
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.
initial state of the LFSR.
The following lists the three shift_type switches of which you can choose only
one.
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.
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.
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.
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.
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.
register path.
Examples
The following example defines an LFSR to be a PRPG and another LFSR to be a
MISR:
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
add lfsrs misr1 misr 5 15 -both -out
add lfsr taps lfsr1 1 3
add lfsr taps misr1 1 2