Address Selection 4-1
Chapter 4
Address Selection
Overview
The PCI-AOB2/4/6 Series use two I/O address spaces, one of 64 bytes and one of 256
bytes. The DACs and control registers occupy the first 16 bytes of the first area. The next
16 addresses are reserved. The digital I/O circuit uses the next 4 register locations. The
other 28 addresses are reserved. The 2nd I/O address space of 256 bytes is used for
software calibration data. These two I/O address spaces are defined in the Port Address
Selection Table in the Programming section of this manual.
PCI architecture is Plug-n-Play. This means that the BIOS or Operating System
determines the resources assigned to PCI cards, rather than the user. As a result, you
cannot set or change the card's base address or IRQ level. You can only determine what
the system has assigned.
To determine the base address that has been assigned, run the PCIFind.EXE utility
program provided. This utility will display a list of all of the ICS Advent cards detected
on the PCI bus, the addresses assigned to each function on each of the cards, and the
respective IRQs.
Alternately, some operating systems (Windows 95/98 and Windows NT 4.0/2000) can be
queried to determine which resources were assigned. In these operating systems, you can
use either PCIFind or the Device Manager utility from the System Properties Applet of the
control panel. The card is installed in the Data Acquisition class of the Device Manager
list. Selecting the card, clicking Properties, and then selecting the Resources Tab will
display a list of the resources allocated to the card.
PCIFind uses the Vendor ID and Device ID to search for your card, then reads the base
addresses and IRQ.
If you want to determine the base address and IRQ yourself, use the following
information.
The Vendor ID for these cards is 494F. (ASCII for "IO")
The Device ID for the PCI-AOB-2 is 6C90h.
The Device ID for the PCI-AOB-4 is 6C98h.
The Device ID for the PCI-AOB-6 is 6CA0h.
The control / DAC / I/O base address is BaseAddresses[2] in the
PCI_COMMON_CONFIG structure, while the calibration base address is
BaseAddresses[3].
Summary of Contents for PCI-AOB2 Series
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