XR17V252
66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT
JULY 2008
REV. 1.0.2
GENERAL DESCRIPTION
The XR17V252
1
(V252) is a single chip 2-channel
66MHz PCI UART (Universal Asynchronous Receiver
and Transmitter) solution, optimized for higher
performance and lower power. The V252 device with
its fifth generation register set is designed to meet the
high
bandwidth
and
power
management
requirements for multi-serial communication ports for
system administration and management. The 32-bit
66MHz PCI interface is compliant with PCI 3.0 and
PCI power management revision 1.1 specifications.
The device provides an upgrade path for Exar’s
33MHz 5V and Universal PCI UART family.
The V252 consists of two independent UART
channels, each with set of configuration and
enhanced registers, 64 bytes of Transmit (TX) and
Receive (RX) FIFOs, and a fractional Baud Rate
Generator (BRG). A global interrupt source register
provides a complete interrupt status indication for
both channels to speed up interrupt parsing. The
V252 device operates at 33/66MHz and features fully
programmable TX and RX FIFO level triggers,
automatic hardware and software flow control, and
automatic RS-485 half duplex direction control output
for software and hardware design simplification.
N
OTE
1:
Covered by U.S. Patents #5,649,122 and #5,949,787
•
Multi-port RS-232/RS-422/RS-485 Cards
•
Point-of-Sale Systems
FEATURES
•
High performance 32-bit 66MHz PCI UART
•
PCI 3.0 compliant
•
PCI power management rev. 1.1 compliant
•
EEPROM interface for PCI configuration
•
3.3V supply with 5V tolerant non-PCI (serial) inputs
•
Data read/write burst operation
•
Global interrupt register for both UART channels
•
Up to 8 Mbps serial data rate
•
Eight multi-purpose inputs/outputs
•
A 16-bit general purpose timer/counter
•
Sleep mode with wake-up Indicator
•
Two independent UART channels controlled with
■
■
16C550 compatible register Set
64-byte TX and RX FIFOs with level counters
and programmable trigger levels
Fractional baud rate generator
Automatic RTS/CTS or DTR/DSR hardware
flow control with programmable hysteresis
Automatic Xon/Xoff software flow control
RS-485 half duplex direction control output
with selectable turn-around delay
■
■
APPLICATIONS
•
Remote Access Servers
•
Storage Network Management
•
Factory Automation and Process Control
•
Instrumentation
F
IGURE
1. B
LOCK
D
IAGRAM OF THE
XR17V252
3.3 V VCC
■
■
•
Infrared (IrDA 1.0) data encoder/decoder
CLK ( up to
66 MHz)
RST#
AD[31:0]
C/BE[3:0]#
FRAME#
IRDY#
TRDY#
DEVSEL
#
STOP#
INTA#
IDSEL
PERR#
SERR#
PAR
PME#
(5 V Tolerant
Serial Inputs)
UART Channel 0
64 Byte TX FIFO
UART
Regs
TX & RX
IR
ENDEC
TX0 , RX0 , DTR0#,
DSR0 #, RTS0#,
CTS0 #, CD0 #, RI0#
PCI Local
Bus
Interface
Device
Configuration
Registers
BRG
64 Byte RX FIFO
UART Channel 1
UART
Regs
64 Byte TX FIFO
TX & RX
BRG
IR
ENDEC
TX1 , RX1 , DTR1#,
DSR1 #, RTS1#,
CTS1 #, CD1 #, RI1#
64 Byte RX FIFO
Configuration
Space
Registers
EECK
EEDI
EEDO
EECS
ENIR
EN485#
EEPROM
Interface
16-bit
Timer/Counter
Multi- purpose
.
Inputs/ Outputs
Crystal Osc / Buffer
MPIO0 - MPIO7
XTAL1
XTAL2
TMRCK
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
•
(510) 668-7000
•
FAX (510) 668-7017
•
www.exar.com
EXAR [ EXAR CORPORATION ]
