Teledyne LeCroy CPCI64 - Manual (Page 4)

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OPERATION
Using these Active Extender boards is no different than using a regular extender board, except that the
Active Extenders boards offer several extra features. These are explained below:
ON-OFF
To insert or remove a Unit-Under-Test while system power is on, make sure that the Active Extender is
turned Off. There are two ways to turn the Active Extender power On and Off. 1) The mechanical toggle
switch on the card. 2) The external control signal.
PCIAX
PCIAX boards may be controlled via a parallel port interface. Turn the On-Off switch to the Off position,
plug a parallel cable between the system port and the board(s) and use the system parallel port address to
turn the board(s) On and Off.
Several PCIAX Rev B (and higher) boards in the same system may be controlled independently, if so
desired. Jumper J6 on the board may be used to configure each board to be turned On and Off by a
different bit of the parallel port. For example, board One may be set to be controlled by D0 and board Two
may be set to be controlled by D1. A Low level for each bit will turn the board On and High will turn the
board Off. While in the software control mode, the PCIAX will power up in the OFF state, when the
computer is first booted. In order to control the PCIAX using software command:
Assuming the system parallel port address is set at 378:
outp (0x378, 0xFF) Will turn all boards Off
outp (0x378, 0x80) Will turn only board one On
outp (0x378, 0x81) Will turn only board two On
CPCI-64
The external control input for the CPCI is at JPX. Top signal is a Ground signal and the bottom signal is
the control signal. To control On-Off by the external signal, you must have the mechanical switch in the
Off position. A Low level, less than 1.5V, will turn the board ON. Revision B and higher CPCI-64,
supports Global Address signals (GA0 – GA4).
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 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.