XR17V254_08 Datasheet, PDF (1/70 Pages) Exar Corporation – 66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT

XR17V254
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
JULY 2008
REV. 1.0.1
GENERAL DESCRIPTION
The XR17V254¹ (V254) is a single chip 4-channel
66MHz PCI (Peripheral Component Interconnect)
UART (Universal Asynchronous Receiver and
Transmitter) solution, optimized for higher
performance and lower power. The V254 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 of
products in a 144-pin LQFP package.
The V254 consists of four 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 all
4 channels to speed up interrupt parsing. The V254
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.
NOTE 1: Covered by U.S. Patents #5,649,122 and #5,949,787
APPLICATIONS
• Remote Access Servers
• Storage Network Management
• Factory Automation and Process Control
• Instrumentation
• Multi-port RS-232/RS-422/RS-485 Cards
• Point-Of-Sales
FEATURES
• High performance 32-bit 66MHz PCI UART
• PCI 3.0 compliance
• PCI power management rev. 1.1 compliance
• EEPROM interface for PCI configuration
• 3.3V supply with 5V tolerant non-PCI (serial) inputs
• Data read/write burst operation
• Global interrupt register for all four 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
• Four 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
■ Infrared (IrDA 1.0) data encoder/decoder
FIGURE 1. BLOCK DIAGRAM OF THE XR17V254
3.3V VCC
CLK (upto
66MHz)
RST#
AD[31:0]
C/BE[3:0]#
FRAME#
IRDY#
TRDY#
DEVSEL#
STOP#
IDSEL
PERR#
SERR#
PAR
INTA#
PME#
EECK
EEDI
EEDO
EECS
GND
PCI Local
Bus
Interface
Device
Configuration
Registers
Configuration
Space
Registers
EEPROM
Interface
16-bit
Timer/Counter
UART Channel 0
UART
Regs
BRG
64 Byte TX FIFO
TX & RX
IR
ENDEC
64 Byte RX FIFO
UART Channel 1
(5V Tolerant
Serial Inputs)
TX0, RX0, DTR0#,
DSR0#, RTS0#,
CTS0#, CD0#, RI0#
UART Channel 2
UART Channel 3
Multi-pu.rpose
Inputs/Outputs
Crystal Osc/Buffer
TX3, RX3, DTR3#,
DSR3#, RTS3#,
CTS3#, CD3#, RI3#
MPIO0- MPIO7
XTAL1
XTAL2
TMRCK
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com