Pci-To-Pci Bridges; Pmc Sites; Pci Idsel Definition; Pci Bus Arbitration - Motorola MVME5500 Installation And Use Manual

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.

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.
Note

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.

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.
http://www.motorola.com/computer/literature
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.
PCI-to-PCI Bridges
4-9
4