emPC-CXR
(
Hardware Manual
)
•
FPGA expansion subsystem
6 - 23
Rev. V1.2
©
Janz Tec AG
6
FPGA expansion subsystem
The PCIe interface for special Janz Tec Features is implemented by a FPGA and is identified by a set
of IDs in PCIe configuration space as listed below:
Purpose
Value
Found in
Vendor ID
0x13C3
CFG space register 0x00
Device ID
0x2A00
CFG space register 0x02
Subsystem Vendor ID
0x13C3
CFG space register 0x2C
Subsystem ID emPC-CXR
0x2A00
CFG space register 0x2E
Table 10: PCI identification
The FPGA PCIe interface provides access to several register spaces.
PCI base
address
register
Description
Size
0
Local configuration registers (memory mapped)
512 B
1
N/A
-
2
CAN/RS232 address space
8 kB
3
Reserved
8 kB
4
Control registers
4 kB
5
NVRAM / IO port address space
1 MB
Table 11: Local address spaces
The actual addresses for these memory spaces are configured by the BIOS of your system every time
the computer is booted. If you wish to access one of these spaces, then you need to read the actual
addresses from the PCIe configuration space.
