OXFORD SEMICONDUCTOR LTD.
OXmPCI954
Improvements of the OXmPCI954 over discrete solutions
Higher degree of integration:
The OXmPCI954 device offers four internal 16C950 high-
performance UARTs and an 8-bit Local Bus or a
Bi-directional parallel port.
Multi-function device:
The OXmPCI954 is a multi-function device to enable users
to load individual device drivers for the internal serial ports,
drivers for the peripheral devices connected to the Local
Bus or drivers for the internal parallel port.
Quad Internal OX16C950 UARTs
The OXmPCI954 device contains four ultra-high
performance UARTs, which can increase driver efficiency
by using features such as the 128-byte deep transmitter &
receiver FIFOs, flexible clock options, automatic flow
control, programmable interrupt and flow control trigger
levels and readable FIFO levels. Data rates are up to
60Mbps.
Improved access timing:
Access to the internal UARTs, require zero or one PCI wait
states. A PCI read transaction from an internal UART can
complete within five PCI clock cycles and a write
transaction to an internal UART can complete within four
PCI clock cycles.
Reduces interrupt latency:
The OXmPCI954 device offers shadowed FIFO levels and
Interrupt status registers of the internal UARTs, and the
MIO pins. This reduces the device driver interrupt latency.
Power management:
The OXmPCI954 device complies with the
PCI Power
Management Specification 1.1
and the Microsoft
Communications Device-class Power Management
Specification 2.0 (2000).
Both functions offer the extended
capabilities for Power Management. This achieves
significant power savings by enabling device drivers to
power down the PCI functions. For function 0, this is
through switching off the channel clock, in power state D3.
Wake-up (PME# generation) can be requested by either
functions. For function 0, this is via the RI# inputs of the
UARTs in the power-state D3 or any modem line and SIN
inputs of the UARTs in power-state D2. For function 1, this
is via the MIO[2] input.
Optional EEPROM:
The OXmPCI954 device can be reconfigured from an
external EEPROM, to the end-user’s requirements.
However, this is not normally required in many applications
as the default values are sufficient for typical applications.
An overrun detection mechanism built into the eeprom
controller prevents the PCI system from ‘hanging’ due to an
incorrectly programmed eeprom.
Subsystem ID and Subsystem Vendor ID
In some cases the Subsystem ID and Subsystem Vendor
ID can be set via input pins.
DS-0019 Jun 05
External—Free Release
Page 7
OXFORD [ OXFORD SEMICONDUCTOR ]
