Lock JTAG scan chain.
Syntax
jtag lock [timeout]Lock JTAG scan chain containing current JTAG target. DESCRIPTION Wait
for scan chain lock to be available and then lock it. If <timeout> is specified the wait time is limited to <timeout> milliseconds. The JTAG lock prevents
other clients from performing any JTAG shifts or state changes on the scan chain.
Other scan chains can be used in parallel. The jtag run_sequence command ensures
that all commands in the sequence are performed in order so the use of jtag lock is
only needed when multiple jtag run_sequence commands needs to be done without
interruption.
Note(s)
- A client should avoid locking more than one scan chain as this can cause dead-lock.
Returns
Nothing.