OX16PCI952
OXFORD SEMICONDUCTOR LTD.
Power management:
Optional EEPROM:
Both functions of the OX16PCI952 comply with the PCI
Power Management Specification 1.0 and the PC98/99
Power Management specifications, by offering the
extended capabilities for Power Management and
supporting the power states D0, D2 and D3. This achieves
significant power savings by allowing device drivers to
power down the PCI functions and disable the UART
channels and the parallel port.
The OX16PCI952 can be reconfigured from an external
MicrowireTM based EEPROM. However, this is not required
in many applications as default values are provided for
typical applications. Features available via the use of the
EEPROM include redefining device ID’s and vendor/sub-
vendor ID fields in the PCI header space, selectively
enabling/disabling interrupts, powerdown and wakeup
requests, and performing function access to pre-configure
the UARTs and the parallel port.
A ‘wake-up’ event (the ‘power management event’) is
requested via the PME# pin from either of the power states
D2 or D3. For the UART channels, this wake-up request is
generated through the UART line RI (for power state D3),
and any modem line and the Serial Data In (for power state
D2). For the parallel port, this wake-up request is
generated through the multi-purpose IO pins, MIO(1:0).
Multi-function device:
The OX16PCI952 is a multi-function device to enable users
to load individual device drivers for the internal serial ports
and the internal parallel port.
DS-0028 Jul 05
External-Free Release
Page 6
OXFORD [ OXFORD SEMICONDUCTOR ]
