OXCF950_06 Datasheet, PDF (1/66 Pages) Oxford Semiconductor – low cost asynchronous 16-bit PC card or Compact Flash UART device

FEATURES
• Single full-duplex asynchronous channel
• 128-byte deep transmitter / receiver FIFO
• Fully software compatible with industry standard
16C550 type UARTs
• Readable FIFO levels
• System clock up to 60MHz
• Flexible clock prescaler from 1 to 31.875
• 9-bit data framing as well as 5,6,7 and 8
• Detection of bad data in the receiver FIFO
• Automated in-band flow control using programmable
Xon/Xoff characters
• Transmitter and receiver can be disabled
• Low power CMOS
• 3.3V operation, 5V tolerant I/O
• Extended temperature range –40C to +105C
• Software compatible with OXCF950
• 16C950 mode for local bus applications
• Generic embedded driver compatibility mode
DESCRIPTION
The OXCF950 rev B is a low cost asynchronous 16-bit PC
card (henceforth referred to as PCMCIA) or Compact Flash
(henceforth referred to as CF) UART (and Local Bus)
device. Local Bus Selection is performed by use of a
MODE pin. Note that Local Bus mode uses indirect
addressing, which is only supported by PCMCIA.
The 3.3V technology has been specified to operate as low
as 2.7 V to allow an in-line regulator to be used for mixed
3V/5V applications. All the I/Os are 5V tolerant with the
exception of the clock/crystal oscillator input.
The EEPROM interface allows the programming of the
Attribute Memory, UART and Local Configuration Registers
during power up or hard/soft reset. This allows different
card manufacturers to modify the information contained in
the Attribute memory or UART/registers as required, for
example PC-Card ID value.
A number of power-down modes are included to keep
power consumption to a minimum. Such features include
clock division (fully programmable) and sleep modes when
a function of the OXCF950 rev B is not being used.
The OXCF950 rev B contains a single-channel ultra-high
performance UART offering data rates up to 15Mbps and
OXCF950 rev B
DATA SHEET
• Programmable by external Microwire^TM EEPROM
(EEPROM programmed via Oxford Semiconductor
utilities).
• Extremely low power consumption by use of
asynchronous UART core and power down (sleep)
modes
• Range of packages -Ultra small 48 pin TQFP package
or a 48 ball TFBGA.
• Supports all UART types 450 up to 950 (fully
programmable)
• CF+ Compliant (Revision 1.4).
• 16-bit PC Card Compliant (PCMCIA Revision 7.1)
• 8 bit Local Bus interface included for PCMCIA
applications
• 2 Multi-purpose I/O pins which can be configured as
interrupt inputs
128-deep transmitter and receiver FIFOs. Deep FIFOs
reduce CPU overhead and allow utilisation of higher data
rates.
It is software compatible with the widely used industry-
standard 16C550 type devices and compatibles, as well as
other OX16C95x family devices.
In addition to increased performance and FIFO size, the
OXCF950 rev B also provides enhanced features including
improved flow control. Automated software flow control
using Xon/Xoff and automated hardware flow control using
CTS#/RTS# and DSR#/DTR# prevent FIFO over-run. Flow
control and interrupt thresholds are fully programmable and
readable, enabling programmers to fine-tune the
performance of their system. FIFO levels are readable to
facilitate fast driver applications.
The addition of software reset enables recovery from
unforeseen error conditions allowing drivers to restart
gracefully. The OXCF950 rev B supports 9-bit data frames
used in multi-drop industrial protocols. It also offers multiple
external clock options for isochronous applications, e.g.
ISDN, xDSL.
Oxford Semiconductor, Inc.
25 Milton Park, Abingdon, Oxon,
OX14 4SH, UK
Tel: [phone]
External—Free Release
© Oxford Semiconductor 2006
OXCF950 DS-0027—Feb 2006
Part Nos. OXCF950-TQ-B
OXCF950-TB-B
OXCF950-TQBG