ADLINK cPCI-7249R - Manual (Page 28)

20 • Registers Format
3
Registers Format
The detailed descriptions of the registers format are specified in this chapter.
This information is quite useful for the programmers who wish to handle the
card by low-level programming. However, we suggest user have to
understand more about the PCI interface then start any low-level
programming. In addition, the contents of this chapter can help users
understand how to use software driver to manipulate this card.
3.1 PCI PnP Registers
This PCI card functions as a 32-bit PCI target device to any master on the
PCI bus. There are three types of registers: PCI Configuration Registers
(PCR), Local Configuration Registers (LCR) and PCI-6308 registers.
The PCR, which is compliant to the PCI-bus specifications, is initialized and
controlled by the plug & play (PnP) PCI BIOS. User‘s can study the PCI
BIOS specification to understand the operation of the PCR. Please contact
with PCISIG to acquire the specifications of the PCI interface.
The PCI bus controller PCI-9050 is provided by PLX technology Inc.
(www.plxtech.com). For more detailed information of LCR, please visit PLX
technology’s web site to download relative information. It is not necessary for
users to understand the details of the LCR if you use the software library.
The PCI PnP BIOS assigns the base address of the LCR. The assigned
address is located at offset 14h of PCR.
The PCI-6308 registers are shown in the next section. The base address,
which is also assigned by the PCI PnP BIOS, is located at offset 18h of PCR.
Therefore, users can read the 18h of PCR to know the base address by using
the BIOS function call.
Please do not try to modify the base address and interrupt which assigned by
the PCI PnP BIOS, it may cause resource confliction in your system.