Emerson MVME55006E manual PCI-to-PCI Bridges, PMC Sites, PCI Idsel Definition, PCI Bus Arbitration

PCI-to-PCI Bridges Functional Description

2.9.3PCI-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.

2.9.4PMC 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.

2.9.5PCI 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.

2.9.6PCI 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.

MVME55006E Single-Board Computer Installation and Use (6806800A37D) 43