Teledyne LeCroy PMC2PCI-64 - Manual (Page 4)

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OPERATION
ON-OFF
To insert or remove any Unit-Under-Test into and out of the Active Extender, make sure that the Active
Extender is turned Off, if the PC power is to stay On. There are two ways to turn the Active Extender power
On and Off. 1) The mechanical toggle switch. 2) External control signal connected to JP3.
External control can be used if remote controlling is desired for turning the power On and Off. Leave the
mechanical switch in the Off position, then use a CMOS or TTL level signal to control turning the power On
via JP3. The left connector of JP3 is ground and the right connector is the control signal. A Low level, less
than 1.5V , will turn the switch ON.
Software control is also possible using the external control with a custom interfacing between the parallel port
and the board. Consult the factory if you need additional help for implementing this feature.
NOTE: During the power Off, all signals become isolated between the bus and the Unit-Under-Test when the
+5V to the Unit-Under-Test becomes less than 3.0V.
NOTE: If you are running a software that relies on a response from the Unit-Under-Test, do not turn off the
Active Extender board unless the handshaking has taken place, Otherwise you may experience a system hang-
up. It may be a good practice to stop the software from running, before isolating the power and the signals to
the Unit-Under-Test.
POWER-ON RESET
Each time the Active Extender board is turned Off and then On, reset signal will be generated from the
extender to the Unit-Under-Test automatically. The duration of this reset is 200 milliseconds. The reset to the
Unit-Under-Test is also activated every time there is a reset from the bus.
BANK SWITCHES
In a normal operation, the bank switches should be left in the closed position. In this case when the power to
the extender is turned on, all of the bus signals will be active to and from the Unit-Under-Test. However,
when there is a problem with the signals from the Unit-Under-Test, the signals can be activated in a smaller
group.
NOTE: The bank switch number 1 controls U1, bank switch 2 controls U2, ... , and the final bank
switch 8 controls U8. For 64 bit extenders, switch 9 controls the ICs U12 and U13 (all 64 bit
signals on the B side) and switch 10 controls ICs U14 and U15 (all 64 bit signals on the A side).
For the signal names and grouping by the U number see the section on the auxiliary pinout.