Motorola CPCI-6115 manual PMC I/O Connector, Host I/O Connector, 110

Transition Module Preparation and Installation PMC I/O Connector

The 80mm is “cut out of the middle” of the PMC I/O module. This means that features in the front half of the module keep their positioning relative to the front edge of the board while features in the back half of the board keep their positioning relative to the back edge of the board.

5.7.9PMC I/O Connector

The mapping used by the CPCI-6115 SBC of the PMC I/O connectors onto the CompactPCI user I/O connectors is reversed by the CPCI-6115-MCPTM. This allows the designer of a PMC to create a PMC I/O module without knowledge of how the CPCI-6115 SBC maps signals through the backplane. There is nothing to tie the PMC I/O module to the CPCI-6115 SBC platform and in this sense the module is “universal”.

5.7.10Host I/O Connector

The second connector on the PMC I/O module is used to provide power and ground to the module. In addition, the remaining pins may be used for host I/O signals. Any host I/O functionality for which there is no space available, or which the cost of does not justify its presence on the standard board, may be implemented in a “host I/O module”. This functionality is special to the host (in this case the CPCI-6115 SBC) and so the host I/O module is not a “universal” module. However, if the host I/O connector pinout is reused on future transition modules, the host I/O module may be reused.

If possible, optional host I/O routed to the host I/O connector will be terminated in such a fashion that the host does not incorrectly determine that a device is connected to that I/O when no module is present. This termination must not interfere with normal operation of the I/O when a module is present.

5.7.11PMC I/O Module Presence Detection and Identification

Presence detection and identification of PMC I/O modules is currently an open issue. It is anticipated that PMCs and PMC I/O modules will be designed as pairs. Any and all of the 64 bits of PMC user I/O are available to the designers to use as they wish to detect and identify an installed PMC I/O module. No standard exists, or is likely to exist, so hopefully the method chosen will be sufficiently robust to prevent accidental misidentification of modules.

Host I/O modules also need to be detected and identified. To this end the I2C bus provided from the CPCI-6115 SBC is connected to both PMC I/O module sites. The addresses and content of the I2C devices to reside on the Host I/O module remain an open issue.

110 CPCI-6115 CompactPCI Single Board Computer Installation and Use (6806800A68D)