Chapter 3 Registers Format; Pci Pnp Registers - NuDAQ PCI-7230 User Manual

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.
20 Registers Format