5.8 JUMPER FUNCTIONS
Jumper H1 is provided to invert the data written to the Contol and Status
Register (CSR). It is configured at the factory such that the test software writes
positive data to the CSR. The data polarity used by this board is controlled by the
selection of data transceivers which interface with the VMEbus. For positive true
data, the jumper H1 is placed in the +5 position, and for negative true data the
jumper H1 is placed in the G position, unless the option of the board is a -1XX then
for positive true data the jumper H1 is placed in the G position, and for negative true
data the jumper H1 is placed in the +5 position.
Jumpers H6 through H13 are used to select the mode of operation for output drivers.
If the jumper is not installed, the output devices operate in the current source mode.
With the jumper installed, the associated output drivers will source as well as sink
current (depending on output logic level). Please refer to the logic truth table in
Figure 5.4-1 for the logical operation of these devices. This table is based on an
impedance to ground.
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