CPC-PCIe is a passive CAN plug-in board for PCIe x1 slots. CPC–PCIe was designed for industrial series application and has a robust and cost efficient construction. CPC-PCIe supports either one or two CAN channels that can be operated independantly with different data rates. The interface comes with the NXP CAN controller SJA1000, that offers good diagnostic attributes.
CPC-PCIe maps the CAN controller(s) directly in the address space of the PC and allows access of the CAN messages with low latencies. Existing software for the supported CAN controller can easily be adapted. The CAN communication with CPC–PCIe may be handled either in interrupt controlled mode or in polled mode, interrupt channels are assigned automatically (Plug & Play).
Optionally, CPC-PCIe is available with galvanic separation between PC and CAN bus. A galvanic separation between the CAN channels is also possible by separate DC/DC converters.
| Pin assignment | Connector D-Sub 9 complying to CiA DS-102 |
|---|---|
| Type of the physical connection | ISO 11898 / Transceiver PCA82C251 |
| Maximum voltage on bus pins | ±30V referring to bus ground |
| Isolation voltage with galvanic separation | ±1000V |
| Resource | Parameter |
|---|---|
| PC address space | Automatic assignment (Plug & Play) |
| Interrupt | Automatic assignment (Plug & Play) |
Configuration and CAN communication with CPC-PCIe are done by accesses to the memory address area of the PC. The appropriate data areas are mapped by CPC-PCIe and “plug & play” software into the memory address space. Due to the direct accesses to the CAN controllers the CAN communication takes place with low latency time.
The memory used by CPC-PCIe is divided in several sections. The control registers allow the detection of the interface type similar to the interfaces CPC-Card, CPC-XT and CPC-104 and the generation of hardware resets for the CAN controllers. The access to the CAN controllers occurs via a separate memory space for each interface. In these memory spaces, the sending and receiving buffers as well as the control registers of the CAN controllers are accessible.
A specification describing the access to the CAN controllers as well as drivers for Windows and Linux are available separately.