Technical data

3 Functional Description
PMCspan PMC Carrier Module Installation and Use (6806800A59B)
15
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 Chapter 5, Connectors, for the pin signal assignments.
The IDSEL for the PCI6150 chip is connected to AD20 on the PMCspan. Therefore the PCI6150
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 PMCspan16E-002. This mates to a 114-pin plug connector, P3, mounted
on the secondary side of the PMCspan26E-010. Refer to Chapter 5, Connectors for the pin
signal assignments.
Clock Configuration
The PCI6150 PCI-to-PCI Bridge chip will access the Clock Configuration logic following a
primary PCI bus reset. The PCI6150 will automatically enable the PCI clock for all four PMC
slots.
PMC Present Signals
The PMC PRESENT signal (BUSMODE1#) from each of the PMC modules (up to four) may be
read any time following a reset through the General Purpose I/O interface in the PCI6150. Refer
to PMC Present Signal Assignment on page 25.
Front Panel LEDs
There are two green LEDs located on the front panel of the PMCspan, one for each PMC
module. Both LEDs will be illuminated during reset. An individual LED will be illuminated
whenever a PMC module has been granted bus mastership of the secondary PCI bus.