Hardware Reference Guide SST-DN4-PCU
Card Overview 13
©2009 Molex Inc.Automation & Electrical Products, Integrated Products Division
Document Edition: 1.0, Document #: 715-0101, Template Edition: 1.1, Template #: QMS-06-045
Use, duplication or disclosure of this document or any of the information contained herein is subject to the restrictions on page ii of this document.
1.2 Card Features
The card is a PCI interface for communication with DeviceNet and other CAN-based networks.
The main features of each channel are:
• 32-bit PCI interface (fully compatible with PCI v2.3)
• Half height short PCI card
• 64 MHz NIOS Processor
• 256 KB of shared RAM
• DeviceNet-compliant 5-pin CAN connector
• Data rate of up to 1M baud for CAN, and 125K, 250K and 500K for DeviceNet
• Bi-color LEDs showing card status
• Isolated CAN physical layer
• Compatible with CAN specification 2.0 part A and part B
1.3 Byte Ordering
The card uses Intel-style (little endian) byte ordering for multi-byte entities LSB-low address and
MSB-high address. If your host system uses Motorola (big endian) byte ordering (MSB-low
address and LSB-high address), you must compensate for byte ordering in software.
The following language macro will compensate for byte ordering in a 16-bit data entity:
#define SWAP_WORD (WordData) ((WordData<<8) | (WordData>>8))
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