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PCI-to-PCI Bridges Functional Description
MVME55006E Single-Board Computer Installation and Use (6806800A37D)
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2.9.3 PCI-to-PCI Bridges
The MVME5500 uses a PCI 2.1 compliant, 66 MHz capable, HiNT PCI 6154 PCI-to-PCI bridge.
The primary side connects to PCI Bus 0.0 of the GT-64260B and PMC/IPMC slot 1. The
secondary side connects to PCI Bus 0.1 on which a PMC expansion connector and the VME
controller resides.
2.9.4 PMC Sites
The MVME5500 board supports two PMC sites. Both sites support processor PMC boards with
two IDSELs and two arbitration request/grant pairs. Slot 1 is connected to PCI Bus 0.0 of the
GT-64260B and is 66 MHz capable. Slot 2 is connected to PCI Bus 1.0 of the GT-64260B and
is also 66 MHz capable.
If a PMC module is plugged into PMC slot 1, the memory mezzanine card cannot be used
because the PMC module covers the memory mezzanine connector.
2.9.5 PCI IDSEL Definition
PCI device configuration registers are accessed by using the IDSEL signal of each PCI agent
to an A/D signal as defined in the Peripheral Component Interconnect (PCI) Local Bus
Specification, Revision 2.2. IDSEL definitions for the MVME5500 are shown in the MVME5500
Single-Board Computer Programmer’s Reference Guide.
2.9.6 PCI Bus Arbitration
PCI arbitration for the MVME5500 PCI Buses 0.0 and 1.0 is provided by an external arbiter
PLD. The arbiter PLD implements a round-robin priority algorithm. PCI arbitration for PCI Bus
0.1 is provided by the HiNT PCI 6154 secondary internal arbiter.