VSBC-6862
Rev 1.43
58
With:
The GCRx registers allow configuration of the IP module main capabilities, as following:
ENIRQ bit:
When set, it enables interrupt request to the processor. Both interrupt
sources, of the IP slot, are controlled with ENIRQ.
After system reset, all interrupt sources are disabled.
IPF5V bit:
Indicates the 5V status on the IP slots.
4.6.3. Interrupt functions
Each IP slot is able to provide up to two interrupt sources. In order to acknowledge these requests, an
interrupt acknowledge cycle was generated by the host processor on the common type like the 68k
family. Since that the PowerPC no more handles this type of bus access, the VSBC-6862's internal
logic provides specific function in order for ensuring interrupt acknowledge compatibility. The process
becomes as follows.
1)
An interrupt request is generated by the IP module.
2)
If the <GCRx.ENIRQ> bit is set, an interrupt is generated on the processor.
3)
The processor goes in interrupt exception.
4)
The processor must generate a read cycle to the IVRx register.
5)
This action starts an interrupt acknowledge cycle (with activation of the /INTSEL
signal) on the IP module and the interrupt vector result is showed on the IVRx
register.
The level to be acknowledged on the IP module is automatically selected.
If both IP IRQ are active, the IP IRQ 0 is acknowledged first.
The IVRx registers contains the 8-bit interrupt vector provided by the IP module during the interrupt
acknowledge cycle.
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