Technical data

3-4
Functional Description
3
On-Board 3.3 Volt Power Supply
The on-board PMCspan power supply circuit generates the 3.3 volts used
by the PCI-to-PCI bridge chip. The PCI-to-PCI bridge consumes 400 mA
maximum, leaving 4.6 Amps available to the PMC adapters. On the
PMCspan-010, 5 Amps is available to the PMC adapters.
PMC Interface
Each PMC slot has three EIA E700 AAAB connectors for a 32-bit PMC
interface to secondary PCI bus and user specific I/O. The PMCspan VME
backplane connector P2 provides 64 I/O signals for PMC 1, and 46 P2 I/O
signals for PMC 2. Refer to Chapter 5, Connectors, for the pin signal
assignments.
PCI Expansion
The PCI Expansion interface is provided by a 114-pin plug connector (P4
or P5) on the secondary side of the PMCspan. This mates to the PCI
Expansion connector on the VME processor module. Refer to Chapter 5,
Connectors, for the pin signal assignments.
The IDSEL for the 21150 chip is connected to AD20 on the PMCspan.
Therefore the 21150 Device Number on the primary PCI bus is 1_0100b.
Secondary Expansion
Secondary PCI bus expansion is provided by a 114-pin receptacle
connector, J3, on the primary side of the PMCspan-001/-002. This mates
to a 114-pin plug connector, P3, mounted on the secondary side of the
PMCspan-010. Refer to Chapter 5, Connectors, for the pin signal
assignments.