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JUNE 2004
XR17D152
UNIVERSAL (3.3V AND 5V) PCI BUS DUAL UART
REV. 1.2.0
GENERAL DESCRIPTION
The XR17D152
1
(D152) is a monolithic dual PCI Bus
Universal Asynchronous Receiver and Transmitter
(UART) in Exar’s PCI Bus UART family. 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 both channels
to speed up interrupt parsing. Each UART is
independently controlled and has its own 16C550
compatible 5G (Fifth Generation) 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, automatic half-duplex control output, wireless
IrDA (Infrared Data Association) infrared encoder/
decoder, 8 multi-purpose inputs/outputs and a 16-bit
general purpose timer/counter.
N
OTE
:
1 Covered by U.S. Patents #5,649,122, #5,949,787
FEATURES
•
High Performance Dual PCI UART
•
Universal PCI Bus Buffers - Auto-sense 3.3V and
5V Operation
•
32-bit PCI Bus 2.3 Target Signalling Compliance
•
A Global Interrupt Source Register for both UARTs
•
Data Transfer in Byte, Word and Double-word
•
Data Read/Write Burst Operation
•
Each UART is independently controlled with:
s
s
s
s
s
s
s
s
s
s
APPLICATIONS
•
Universal PCI Bus Add-in Card
•
Network Management
•
Factory Automation and Process Control
•
Ethernet Network to Serial Ports
•
Point-of-Sale Systems
•
Multi serial ports RS-232/RS-422/RS-485 Cards
F
IGURE
1. B
LOCK
D
IAGRAM
3.3V or 5V
(PCI VI/O
Power Supply)
CLK (33 MHz)
16C550 Compatible 5G Register Set
64-byte Transmit and Receive FIFOs
Transmit and Receive FIFO Level Counters
Programmable TX and RX FIFO Trigger Level
Automatic RTS/CTS or DTR/DSR Flow Control
Automatic Xon/Xoff Software Flow Control
Automatic RS485 HDX Control Output with
Selectable Turn-around Delay
Infrared (IrDA 1.0) Data Encoder/Decoder
Programmable Data Rate with Prescaler
Up to 6.25 Mbps Data Rate at 8X Sampling
•
Eight Multi-Purpose Inputs/outputs
•
A General Purpose 16-bit Timer/Counter
•
Sleep Mode with Automatic Wake-up
•
EEPROM Interface for PCI Configuration
•
Same package and pin-out as the XR17C152
(14x14x1.0 mm TQFP
)
VCC
(Core Logic)
GND
UART Channel 0
64 Byte TX F IFO
UA RT
Regs
TX & R X
IR
EN DEC
RST#
AD[31:0]
C/BE[3:0]#
FRAME#
IRDY#
TRDY#
DEVSEL#
STOP#
INTA#
IDSEL
PERR#
SERR#
PAR
TX0, RX0, DTR0#,
DSR0#, RTS0#,
CTS0#, CD0#, RI0#
PCI Local
Bus
Interface
Device
Configuration
Registers
BR G
64 Byte RX FIFO
UART Channel 1
UA RT
Regs
64 Byte TX F IFO
TX & R X
BR G
IR
EN DEC
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 ]
