BVME4000/6000
38
Copyright
1993,1995,1998,2001 BVM Ltd.
7.8.4.6 Local IRQ Status Register
Bit 7-4:
Reserved.
These bits are unused. When read, their state is undefined.
Bit 3:
ABORT: Abort Switch Interrupt.
This bit indicates the status of the ABORT switch. If this bit is SET the ABORT switch is
pressed. This will also generate an Auto-vector level 7 interrupt, so this bit can be used to
determine that the ABORT switch was the source of an Auto-vector level 7 interrupt.
Bit 2:
ACFAIL: VMEbus ACFAIL Interrupt.
This bit indicates the status of the VMEbus ACFAIL signal. If this bit is SET the ACFAIL signal
is active. This will also generate an Auto-vector level 7 interrupt, so this bit can be used to
determine that the ACFAIL signal was the source of an Auto-vector level 7 interrupt.
Bit 1:
ETHERR: Ethernet ERROR Interrupt.
This bit indicates that a 82596CA Ethernet Controller BUS ERROR has occurred - refer to
"7.7.5 Bus Error Handling (on page 34)" for more details.
Bit 0:
ETHIRQ: Ethernet Interrupt Level.
This bit indicates the status of the 82596CA Ethernet Controller interrupt signal. If this bit is
SET the 82596CA's interrupt signal is active.
Note:
This does not indicate the status of the
internal interrupt signal controlled by ETHEN, but indicates the status of the 82596CA's
interrupt signal directly. The 82596CA will pulse its interrupt line inactive whenever a 'new'
interrupt condition becomes true within the device. Thus to distinguish between an Ethernet
Error interrupt and a normal Ethernet interrupt, the ETHERR bit should be interrogated; not
the ETHIRQ bit.
Содержание BVME4000
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