ADLINK PCI-7224 - Manual (Page 31)

Registers Format
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3
Registers Format
The detailed description of the registers format are specified in this chapter.
This information is useful for the programmers who wish to handle the card
by low-level programming. However, it is strongly recommended that the user
has a more in depth understanding of the PCI interface before starting any
low-level programming. In addition, the contents of this chapter can help the
user understand how to use the software driver to manipulate this card.
3.1 PCI Plug and Play 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 and Play PCI BIOS. Users can study the PCI BIOS
specification to understand the operation of the PCR. Please contact 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 on LCR, please visit the
PLX technology website to download the relative information. Users are not
required to understand the details of the LCR if they are using the software
library. The PCI Plug and Play 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 Plug and Play BIOS, is located at offset
18h of PCR. Therefore, users can read the 18h of PCR to find the base
address by using the BIOS function call.
Please do not try to modify the base address and interrupt which are
assigned by the PCI Plug and Play BIOS as it may cause resource conflict in
your system.