XR17C154 Datasheet, PDF (1/62 Pages) Exar Corporation – 5V PCI BUS QUAD UART

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JUNE 2004
GENERAL DESCRIPTION
The XR17C154¹ (154) is a quad PCI Bus Universal
Asynchronous Receiver and Transmitter (UART) with
same package and pin-out as the Exar XR17x158 oc-
tal UARTs. The device is designed to meet today’s
32-bit PCI Bus and high bandwidth requirements in
communication systems. The global interrupt source
register provides a complete interrupt status indica-
tion 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 trans-
mit and receive FIFO trigger levels, transmit and re-
ceive FIFO level counters, automatic hardware flow
control with programmable hysteresis, automatic soft-
ware (Xon/Xoff) flow control, IrDA (Infrared Data As-
sociation) encoder/decoder, 8 multi-purpose defin-
able inputs/outputs, and a 16-bit general purpose tim-
er/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
XR17C154
5V PCI BUS QUAD UART
FEATURES
REV. 1.3.0
• High Performance Quad UART
• PCI Bus 2.2 Target Interface Compliance
• 5V PCI Bus Compliant up to 33MHz Clock
• 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 16 Selectable Turn-around Delay
• Infrared (IrDA 1.0) Data Encoder/Decoder
• Programmable Data Rate with Prescaler
• Up to 6.25 Mbps Serial Data Rate at 8X and 5V
• Eight Multi-Purpose Inputs/outputs
• A General Purpose 16-bit Timer/Counter
• Sleep Mode with Automatic Wake-up Indicator
• Same Package and Pin-out as the XR17C158,
XR17D154 and XR17D158 UART
• 20x20x1.4mm 144-TQFP package
FIGURE 1. BLOCK DIAGRAM
CLK (33MHz)
RST#
AD[31:0]
C/BE[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
Timer/Counter
UART Channel 0
UART
Regs
BRG
64 Byte TX FIFO
TX & RX
IR
ENDEC
64 Byte RX FIFO
UART Channel 1
UART Channel 2
UART Channel 3
Multi-pur.pose
Inputs/Outputs
Crystal Osc/Buffer
5V 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