F
EATURES
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OXCB950
DATASHEET
Integrated High Performance UART
Cardbus / 3.3v PCI interface
DS_B005A_00
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Arbitrary trigger levels for receiver and transmitter
FIFO interrupts and automatic in-band and out-of-
band flow control
Infra-red (IrDA) receiver and transmitter operation
9-bit data framing as well as 5,6,7 and 8
Global Interrupt Status and readable FIFO levels to
facilitate implementation of efficient device drivers
Detection of bad data in the receiver FIFO
Operation via IO or memory mapping.
2 multi-purpose I/O pins which can be configured as
interrupt input or ‘wake-up’ pins
Auto-detection of optional Microwire
TM
EEPROM, to
reconfigure device
3.3V operation
100 pin TQFP package
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Single high-performance UART channel
Cardbus/3.3v PCI compliant, single-function target
controller. Fully compliant to PC Card Standards,
and PCI Bus Specification 2.2, Power Management
1.0
Function access to preconfigure the UART prior to
handover to generic device drivers
UART fully software compatible with 16C550-type
devices.
Baud rates up to 15Mbps in asynchronous mode and
60Mbps in external 1x clock mode
128-byte deep FIFO per transmitter and receiver
Flexible clock prescaler from 1 to 31.875
Automated in-band flow control using programmable
Xon/Xoff in both directions
Automated out-of-band flow control using CTS#/RTS#
and/or DSR#/DTR#
D
ESCRIPTION
The OXCB950 is a single chip UART solution for either
cardbus or PCI-based serial add-in cards. It is a single
function device, offering memory or IO mapped access to
the ultra-high performance 950-type UART.
This UART is the fastest available PC-compatible UART,
offering data rates up to 15Mbps and 128-byte deep
transmitter and receiver FIFOs. The deep FIFOs reduce
CPU overhead and allow utilisation of higher data rates.
The UART is software compatible with the widely used
industry-standard 16C550 devices and compatibles, as
well as the OX16C95x family of high performance UARTs.
In addition to increased performance and FIFO size, the
UART also provides the full set of OX16C95x enhanced
features including automated in-band flow control, readable
FIFO levels etc.
A set of local registers is available to enhance device driver
efficiency and reduce interrupt latency. The internal UART
has features such as shadowed FIFO fill levels, an interrupt
source register and Good-Data Status, readable in one
DWORD register visible to logical function0 in IO space
and memory space.
The efficient 32-bit, 33MHz target-only interface is
compliant with both the cardbus sections of the PC CARD
Standards, and the PCI bus specifications version 2.2 and
version 1.0 of PCI Power Management Specification.
For full flexibility, all the default register values can be
overwritten using an optional Microwire
TM
serial EEPROM.
This EEPROM can also be used to provide
function access
to pre-configure the UART into enhanced modes prior to
any cardbus/PCI configuration accesses and before control
is handed to generic device drivers.
Oxford Semiconductor Ltd.
External—Free Release
25 Milton Park, Abingdon, Oxon
OX14 4SH, UK
Tel: +44 (0)1235 824900
Fax: +44(0)1235 821141
Oxford Semiconductor 2005
OXCB950 Datasheet DS-0033 Sep 05
Part Nos. OXCB950-TQC60-A
OXCB950-TQAG
OXFORD [ OXFORD SEMICONDUCTOR ]
