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110 Agilent E1330B Digital I/O Module Register Information

Appendix B

The module is a register-based slave/interrupter device, supporting VME

D16, D8(O), and D8(OE) transfers. The interrupt protocol supported is

“release on interrupt acknowledge” – an interrupt is cleared by a VXIbus

interrupt acknowledge cycle.

WARNING Registers have been documented as 8 bit bytes. If you access

them using 16 bit transfers from a Motorola CPU, the high and

low byte will be swapped. The Agilent E1300/01 Mainframe and

Agilent E1405/06 Command Modules use Motorola CPUs.

Motorola CPUs place the highest weighted byte in the lower

memory location and the lower weighted byte in the higher

memory address; Intel processors do just the opposite. VXI

registers are memory mapped, thus you will see this

Motorola/Intel byte swap difference when doing register

programming.

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