XR17L154 Datasheet, PDF (1/56 Pages) Exar Corporation – 3.3V PCI BUS QUAD UART

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XR17L154
3.3V PCI BUS QUAD UART
AUGUST 2003
REV. 1.1.0
GENERAL DESCRIPTION
The XR17L154¹ (L154) is a quad PCI Bus Universal
Asynchronous Receiver and Transmitter (UART) with
same package and pin-out as the Exar XR17C158
octal UART. The device is designed to meet today’s
32-bit PCI Bus and high bandwidth requirement in
communication systems. The global interrupt source
register provides a complete interrupt status
indication for all 4 channels to speed up interrupt
parsing. Each UART is independently controlled and
has its own 16C550 compatible 5G register set,
transmit and receive FIFOs of 64 bytes, fully
programmable transmit and receive FIFO trigger
levels, transmit and receive FIFO level counters,
automatic hardware flow control with programmable
hysteresis, automatic software (Xon/Xoff) flow
control, IrDA (Infrared Data Association) encoder/
decoder, 8 multi-purpose definable inputs/outputs,
and a 16-bit general purpose timer/counter.
NOTE: 1 Covered by U.S. Patents #5,649,122, #5,949,787
APPLICATIONS
• Remote Access Servers
• Ethernet Network to Serial Ports
• Network Management
• Factory Automation and Process Control
• Point-of-Sale Systems
• Multi-port RS-232/RS-422/RS-485 Cards
FEATURES
• High Performance Quad UART
• PCI Bus 2.2 Target Interface Compliance
• 3.3 Volt PCI Bus Compliant up to 33 MHz Clock
• 5 Volt Tolerant Serial Inputs
• 32-bit PCI Bus Interface with EEPROM Interface
• A Global Interrupt Source Register for all 4 UARTs
• Data Transfer in Byte, Word and Double-word
• Data Read/Write Burst Operation
• Each UART is independently Controlled with:
•16C550 Compatible 5G (Fifth Gen) Register Set
•64-byte Transmit and Receive FIFOs
•Transmit and Receive FIFO Level Counters
•Automatic RTS/CTS or DTR/DSR Flow Control
•Automatic Xon/Xoff Software Flow Control
•Automatic RS485 Half-duplex Control Output with
Selectable Turn-around Delay (0 to 15 bit-times)
•Infrared (IrDA 1.0) Data Encoder/Decoder
•Programmable Data Rate with Prescaler
•Up to 4 Mbps Serial Data Rate at 8X
• Eight Multi-Purpose Inputs/outputs
• General Purpose 16-bit Timer/Counter
• Sleep Mode with Automatic Wake-up
• Same Package and Pin-out as the XR17C158,
XR17D158, XR17C154 and XR17D154 UARTs
FIGURE 1. BLOCK DIAGRAM
CLK (33MHz)
RST#
AD[31:0]
C /B E [3 :0 ]#
FRAME#
IRDY#
TRDY#
DEVSEL#
STOP#
INTA#
IDSEL
PERR#
SERR#
PAR
EECK
EEDI
EEDO
EECS
ENIR
PCI Local
Bus
Interface
Device
Configuration
Registers
Configuration
Space
Registers
EEPROM
Interface
16-bit
T im er/C o un te r
*5V Tolerance for non-PCI Inputs
UART Channel 0
UART
Regs
64 Byte TX FIFO
TX & RX
IR
ENDEC
BRG
64 Byte RX FIFO
UART Channel 1
UART Channel 2
UART Channel 3
M u lt i-p u r.p o s e
Inputs/Outputs
Crystal Osc/Buffer
3.3V VCC
GND
TX0, RX0, DTR0#,
DSR0#, RTS0#,
CTS0#, CD0#, RI0#
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