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Prodigy/CME PC/104 User’s Guide
57
3
3.Accessing Card Resources
In This Chapter
Resource Addressing
Accessing the Communications Ports
Accessing On-Card Resources
Accessing Magellan-Attached Devices
PRP Communication Formats
3.1
Resource Addressing
The Prodigy/CME PC/104 card’s various features and capabilities are organized into groups called ‘resources.’ For
example, to communicate with the Prodigy/CME PC/104 card’s Magellan Motion Processor, the host controller sends
a command to the
MotionProcessor
resource.
To address different types of resources, the Prodigy/CME PC/104 cards provides a general purpose resource addressing
scheme called the
PMD Resource access Protocol
(PRP). PRP is a sophisticated general purpose addressing scheme that
allows:
• one or more host controllers to communicate with Prodigy/CME PC/104 cards
• Prodigy/CME cards to communicate with each other
• Prodigy/CME cards to communicate with other PMD products such as IONs and
non-/CME Prodigy cards
• Prodigy/CME cards to communicate with user-designed hardware, or other off-the-shelf hardware.
3.1.1
PMD Resource Access Protocol (PRP)
The core of the PMD Resource access Protocol is a header that accompanies all PRP communications. Figure 3-1 on
page 58 shows the format of the resource access protocol header. The PRP header is a single 16-bit word divided into
five fields. Normally, the PRP header is immediately followed by a message body, but there are certain communications
that do not require a message body. PRP headers are used in both the outgoing, and the response packet. The returned
PRP header is 1 byte in length, consisting of the version field, the status code field, and 4 reserved bits.
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