
C
URTISS
-W
RIGHT
C
ONTROLS
E
MBEDDED
C
OMPUTING
PMC-605 PCI-P0 B
RIDGE
M
ODULE
809524 R
EVISION
D F
EBRUARY
2009
1-9
F
IGURE
1.6: Inter-Card Interrupt Mechanism
Generating PCI-P0
Bus Interrupts
The PMC-605 can generate an interrupt on PCI-P0 bus (INTA#) using the doorbell registers
in the 21554. This interrupt is routed to INTA# on the host PCI bus.
Inter-card Interrupt
Mechanism
The PMC-605 uses the 21554 Secondary Interrupt Request register to assert INTA# on the
host PCI bus. This provides an inter-card interrupt mechanism directly under software
control.
R
ESET
Only a card with TERMDIS grounded can generate a PCI-P0 Reset. It can either follow the
Reset signal from the host or it can be initiated from the host through software.
The PMC-605 does not accept resets from the PCI-P0 bus, regardless of the state of
TERMDIS. If an external PMC-605 reset is required, this must be done via the host
basecard’s VME interface.
Basecard
PMC-605
21554
CPLD
System Slot 0
Peripheral Slot 1
Peripheral Slot 2
Basecard
PMC-605
21554
CPLD
Basecard
PMC-605
21554
CPLD
INTA#
INTA#
INTA#
INTA#
INTA#
INTA#
PCI-P0 Bus
Cross Reference
The PCI-P0 INTA# to the host PCI bus is enabled and disabled by a software-controllable bit
in the PMC-605’s Local Control and Status Register (LCSR). Refer to page 1-10 for
information on the LCSR.
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