BECKHOFF C1300 - Manual (Page 40)

C1300 VME to II/O Interface Unit Beckhoff II/O-System
Page 40 of 44 Version : 2.01 Date : 18.12.95
IRQ Data out:
- - - - IO3 IO2 IO1 IO0
If the VME system modifies this mask it will be transmitted into the interrupt field. The nibble
will be transmitted into the interrupt field, untill it is removed by the VME system.
IRQ Data in:
- - - - II3 II2 II1 II0
If a peripheral module generates an address-independent interrupt and if this interrupt is
released by the interrupt mask, it is transmitted through this mask to to the VME system.
Queueing interrupts are buffered by the C1300, i.e. there is only one interrupt at a time
transmitted through the GCB to the VME system. Only after this one was recognized by the
VME system ,the next interrupt can be transmitted
VMEbus interrupt vector and interrupt level register:
The C1300 includes a D08-VMEbus Interrupter. The interrupt vector may be dynamically
loaded at address 0FF1h and transfered to the VMEbus at the next valid IACK-cycle.The
interrupt level can be programmed at address 0FF0h. Only one interrupt level should be
activated at one time. Bit 0 of the interrupt level register has no meaning.