AcQuisition Technology Quad M-module Carrier i4000 Manual do hardware - Página 8

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i4000 - Quad M-module Carrier for VMEbus

3.2. The interrupter

The i4000 has a special interrupter which is largely compatible with the M68C153. The
interrupter is a so called D08(O) type interrupter which means that the interrupter
during an interrupt acknowledge cycle will put a status byte on the data line D0-D7. The
interrupter has one interrupt level (IRQ1-IRQ7) selectable by dip switches (SW3) for all
the modules. Each module can generate its own vector.
There are two classes of interrupters which are both supported by the i4000: release on
acknowledge (ROAK) or release on register access (RORA). The ROAK interrupter
negates its interrupt request line in response to an interrupt acknowledge cycle. This
mechanism will work with all handlers. The RORA interrupter releases its request when
the handler accesses an on-board register during the interrupt service routine. The
handler performs the acknowledge cycle but the interrupter does not immediately
negate its request. Sometime during the service routine the handler will have to write to
a register on the interrupter which causes it to negate the request.
Figure 3 Interrupt request Level
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