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Chapter 3 Programming
IPMC7126E/7616E I/O Module Installation and Use (6806800A45B)
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MVME6100
The MVME6100 IPMC module PCI arbitration is performed by the MV64360 ASIC. The internal
PCI arbiter REQ#/GNT# signals are multiplexed on the MV64360 MPP[31:0] pins. The internal
PCI arbiter is disabled by default (the MPP pins function as general purpose inputs). Software
will configure the MPP pins to function as request/grant pairs for the internal PCI arbiter.
The IPMC module arbitration pairs for the MVME6100 are assigned to the MPP pins as follows;
■ MPP pin 8, PCI Bus Grant (PIB device on IPMC module)
■ MPP pin 9, PCI Bus Request (PIB device on IPMC module)
■ MPP pin 12, PCI Bus Grant (SCSI device on IPMC module)
■ MPP pin 13, PCI Bus Request (SCSI device on IPMC module)
Interrupt Assignments
The interrupt architecture for the IPMC712 and IPMC761 is fully compliant with the PowerPlusII
Programming Specification for a single processor board configuration.
MVME5100 IPMC Module Interrupt Assignments
Legacy interrupt assignment for the PCI-to-ISA Bridge (PIB) is maintained to ensure software
compatibility between MVME5100 and IPMC761 while in IPMC mode. This is accomplished by
using the on-board IPMC761 connector to route the PIB’s interrupt to external interrupt 0 of the
Hawk’s MPIC.
The MVME5100 Ethernet port 2 is routed to the PIB’s IRQ10 input. The SCSI interrupt on the
IPMC761 is also routed to the PIB at IRQ14. The SCSI device is connected to the INTA# pin
J11-04 of PMC Slot 1. Interrupts are routed to the Hawk from on-board resources as specified
by the module’s programming.
The Hawk interrupt assignments are shown below:
Notes
1. This interrupt provided for software compatibility with MVME2700.
Table 3-6. Hawk MPIC Interrupt Assignments
MPICI
RQ
Edge/Leve
l
Polarity Interrupt Source
Note
s
IRQ0 Level High PIB (8259) in PMC Slot 1 1
IRQ9 Level Low SCSI Controller interrupt shall be connected to
INTA# pin J11-04
2