Struck SIS3153 - USB VME Interrupt Status Register

SIS Documentation
SIS3153
VME interface
Page 17 of 38
3.2.8 USB VME Interrupt Status Register
#define SIS3153USB_VME_INTERRUPT_STATUS 0x12
This register reflects the status of the VME IRQ lines. It can be used to check on the
occurrence of a VME interrupt.
Bit
Function
31
0
..
..
20
0
19
Test: set IRQ
..
Test: IRQ level 2
..
Test: IRQ level 1
16
Test: IRQ level 0
15
..
..
8
0
7
Status VME IRQ 7 on VME BUS
6
Status VME IRQ 6 on VME BUS
5
Status VME IRQ 5 on VME BUS
4
Status VME IRQ 4 on VME BUS
3
Status VME IRQ 3 on VME BUS
2
Status VME IRQ 2 on VME BUS
1
Status VME IRQ 1 on VME BUS
0
0
Note:
To create an IACK cycle you have to execute a D8 VME read cycle with AM=0x4000 from
the address defined by (irq_level<<1)+1.. The read returns the interrupt vector as datum.
Examples:
VME IRQ level = 1 -> address = 3
VME IRQ level = 4 -> address = 9
VME IRQ level = 6 -> address = 0xd