SERIES AP445 ACROPACK
USER
’S MANUAL
Acromag, Inc. Tel: 248-295-0310
- 16 - http://www.acromag.com
- 16 -
www.acromag.com
3.0 PROGRAMMING INFORMATION
This Section provides the specific information necessary to program and
operate the AP445 module.
The PCIe bus is defined to address three distinct address spaces: I/O,
memory, and configuration space. The AcroPack module can be accessed
via the PCIe bus memory space and configuration spaces, only.
The AcroPack configuration registers are initialized by system software at
power-up to configure the card. The AP445 module is a Plug-and-Play PCIe
card. As a Plug-and-Play card the board’s base address and system interrupt
request are not selected via jumpers but are assigned by system software
upon power-up via the configuration registers. A PCIe bus configuration
access is used to access an AcroPack’s configuration registers.
When the computer is first powered-up, the computer’s system
configuration software scans the PCIe bus to determine what PCIe devices
are present. The software also determines the configuration requirements
of the PCIe card.
The system software accesses the configuration registers to determine how
many blocks of memory space the module requires. It then programs the
board’s configuration registers with the unique memory base address.
Since this board is not fixed in address space, its device driver must use the
mapping information stored in the board’s Configuration Space registers to
determine where the board is mapped in memory space.
CONFIGURATION REGISTERS
The PCIe specification requires software driven initialization and
configuration via the Configuration Address space. This board provides 512
bytes of configuration registers for this purpose. It contains the
configuration registers shown in the following table to facilitate Plug-and-
Play compatibility.
The Configuration Registers are accessed via the Configuration Address and
Data Ports. The most important Configuration Registers are the Base
Address Registers and the Interrupt Register which must be read to
determine the base address assigned to the board and the interrupt request
that goes active on a board interrupt request. Interrupts are not supported
on the AP445 module.
