User`s guide

20 • Registers
3.1 PCI PnP Registers
The PCI-9111 functions as a 32-bit PCI target device to any master on the PCI
bus. It supports burst transfer to memory space by using 32-bit data. All data
read and write is base on 32-bit data. There are three types of registers on the
PCI-9111: The PCI Configuration Registers (PCR), Local Configuration
Registers (LCR) and the 9111 registers.
The PCR is compliant to the PCI-bus specifications. It is initialized and
controlled by the plug & play (PnP) PCI BIOS. User 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 of the LCR, please visit
PLX technology’s web site. It is not necessary for users to fully understand in
detail the LCR if the software library is used. The PCI PnP BIOS assigns the
base address of the LCR. The assigned address is located at 14h of PCR.
The PCI-9111 registers are shown in the next section. The base address,
which is also assigned by the PCI PnP BIOS, is located at an offset of 18h of
the PCR. Do not try to modify the base address and interrupt which is
assigned by the PCI PnP BIOS; it may cause resource conflicts in your system.