Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com
XR16V598
2.25V TO 3.6V HIGH PERFORMANCE OCTAL UART WITH 16-BYTE FIFO
JULY 2008
REV. 1.0.3
GENERAL DESCRIPTION
The XR16V5981 (598), is a 2.25V to 3.6V octal
Universal Asynchronous Receiver and Transmitter
(UART) with 5V tolerant inputs. The highly integrated
device is designed for high bandwidth requirement in
communication systems. The global interrupt source
register
provides
a
complete
interrupt
status
indication for all 8 channels to speed up interrupt
parsing. Each UART has its own 16C550 compatible
set of configuration registers, TX and RX FIFOs of 16
bytes, fully programmable transmit and receive FIFO
trigger levels, automatic RTS/CTS or DTR/DSR
hardware flow control with programmable hysteresis,
automatic software (Xon/Xoff) flow control, RS-485
half-duplex direction control with programmable turn-
around delay, Intel or Motorola bus interface and
sleep mode with a wake-up indicator.
NOTE: Covered by US patents #5,649,122 and #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
2.25V to 3.6V with 5V Tolerant Inputs
Single Interrupt output for all 8 UARTs
A Global Interrupt Source Register for all 8 UARTs
5G “Flat” UART Registers for easier programming
Simultaneous Initialization of all UART channels
General Purpose 16-bit Timer/counter
Sleep Mode with Wake-up Indication
Highly Integrated Device for Space Saving
Each UART is independently controlled with:
■ 16C550 Compatible 5G Register Set
■ 16-byte Transmit and Receive FIFOs
■ Fractional Baud Rate Generator
■ Programmable TX and RX FIFO Trigger Level
■ Automatic RTS/CTS or DTR/DSR Flow Control
■ Automatic Xon/Xoff Software Flow Control
■ RS485 HDX Control Output with Selectable
Turn-around Delay
■ Infrared (IrDA 1.0) Data Encoder/Decoder
■ Programmable Data Rate with Prescaler
Up to 15 Mbps Serial Data Rate
Pin compatible to XR16V798 and XR16V698.
Same 100-pin QFP Package (14x20x3 mm)
FIGURE 1. BLOCK DIAGRAM
TMRCK
Device
Configuration
Registers
XTAL1
XTAL2
Crystal Osc/Buffer
UART Channel 0
TX0, RX0, DTR0#,
DSR0#, RTS0#,
CTS0#, CD0#, RI0#
Data Bus
Interface
RST#
A7:A0
IOR#
IOW#
CS#
INT#
TX7, RX7, DTR7#,
DSR7#, RTS7#,
CTS7#, CD7#, RI7#
UART Channel 7
UART Channel 6
UART Channel 5
UART Channel 4
UART Channel 3
UART Channel 2
UART Channel 1
16-bit
Timer/Counter
16 Byte TX FIFO
16 Byte RX FIFO
BRG
IR
ENDEC
TX & RX
UART
Regs
D7:D0
16/68#