OX12PCI840
OXFORD SEMICONDUCTOR LTD.
3 CONFIGURATION & OPERATION
The OX12PCI840 is a single function, target-only PCI
device, compliant with the PCI Local Bus Specification,
Revision 2.2 and PCI Power Management Specification,
Revision 1.0.
There are a set of Local configuration registers that can be
used to enable signals and interrupts, and configure
timings. These can be set up by drivers or from the
EEPROM.
The OX12PCI840 is configured by system start-up
software during the bootstrap process that follows bus
reset. The system scans the bus and reads the vendor and
device identification codes from any devices it finds. It then
loads device-driver software according to this information
and configures the I/O, memory and interrupt resources.
Device drivers can then access the functions at the
assigned addresses in the usual fashion, with the improved
data throughput provided by PCI.
All registers default after reset to suitable values for typical
applications. However, all identification, control and timing
registers can be redefined using an optional serial
EEPROM. As an additional enhancement, the EEPROM
can be used to program the parallel port, allowing pre-
configuration, without requiring driver changes.
DS-0021 Jun 05
Page 8
OXFORD [ OXFORD SEMICONDUCTOR ]
