XR16M770IL32-0A-EB datasheet, PDF

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XR16M770IL32-0A-EB: Descriptioninterface development tools eval board for xr16m770il32 series; CategoryDevelopment board/suite/development tools; File Size489KB，52 Pages; ManufacturerExar [Exar Corporation]; Environmental Compliance

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XR16M770IL32-0A-EB Overview

interface development tools eval board for xr16m770il32 series

XR16M770IL32-0A-EB Parametric

Parameter Name	Attribute value
Manufacture	Ex
Product Category	Interface Development Tools
RoHS	Yes

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XR16M770

1.62V TO 3.63V HIGH PERFORMANCE UART WITH 64-BYTE FIFO

DECEMBER 2009

REV. 1.0.2

GENERAL DESCRIPTION

The XR16M770

(M770) is an enhanced Universal

Asynchronous Receiver and Transmitter (UART) with

64 bytes of transmit and receive FIFOs,

programmable transmit and receive FIFO trigger

levels, automatic hardware and software flow control,

and data rates of up to 16 Mbps at 3.3V, 12.5 Mbps at

2.5V and 7.5 Mbps at 1.8V with 4X data sampling

rate.

The Auto RS-485 Half-Duplex Direction control

feature simplifies both the hardware and software for

half-duplex RS-485 applications. In addition, the

Multidrop mode with Auto Address detection

increases the performance by simplifying the

software routines.

The Independent TX/RX Baud Rate Generator

feature allows the transmitter and receiver to operate

at different baud rates. Power consumption of the

M770 can be minimized by enabling the sleep mode

and PowerSave mode.

The M770 has a 16550 compatible register set that

provide users with operating status and control,

receiver error indications, and modem serial interface

controls. An internal loopback capability allows

onboard diagnostics. The M770 is available in 24-pin

QFN, 32-pin QFN and 25-pin BGA packages. All

three packages offer the 16 mode (Intel bus) interface

only.

OTE

1 Covered by U.S. Patent #5,649,122.

FEATURES

•

Pin-to-pin compatible with XR16L570 in 24-QFN

and 32-QFN packages

•

Intel data bus Interface

•

16 Mbps maximum data rate

•

Programmable TX/RX FIFO Trigger Levels

•

TX/RX FIFO Level Counters

•

Independent TX/RX Baud Rate Generator

•

Fractional Baud Rate Generator

•

Auto RTS/CTS Hardware Flow Control

•

Auto XON/XOFF Software Flow Control

•

Auto RS-485 Half-Duplex Direction Control

•

Multidrop mode w/ Auto Address Detect

•

Sleep Mode with Automatic Wake-up

•

PowerSave mode in 24-pin QFN package

•

Infrared (IrDA 1.0 and 1.1) mode

•

1.62V to 3.63V supply operation

•

Crystal oscillator or external clock input

APPLICATIONS

•

Personal Digital Assistants (PDA)

•

Cellular Phones/Data Devices

•

Battery-Operated Devices

•

Global Positioning System (GPS)

•

Bluetooth

IGURE

1. XR16M770 B

LOCK

IAGRAM

P w rS a v e

A 2 :A 0

D 7 :D 0

IO R #

IO W #

CS#

IN T

RESET

UART

Regs

UART

6 4 B y te T X F IF O

TX &

ENDEC

VCC

(1 .6 2 to 3 .6 3 V )

GND

TX, RX,

RTS#, CTS#,

DTR#, DSR#,

R I# , C D #

In te l

D a ta B u s

In te rfa c e

BRG

6 4 B y te R X F IF O

C ry s ta l O s c /B u ffe r

XTAL1

XTAL2

Exar

Corporation 48720 Kato Road, Fremont CA, 94538

•

(510) 668-7000

•

FAX (510) 668-7017

•

www.exar.com

XR16M770

REV. 1.0.2

1.62V TO 3.63V HIGH PERFORMANCE UART WITH 64-BYTE FIFO

1.0 PRODUCT DESCRIPTION

The XR16M770 (M770) is a high performance single channel UART. The configuration registers set is 16550

UART compatible for control, status and data transfer. Additionally, the M770 channel has 64 bytes of transmit

and receive FIFOs, Automatic RTS/CTS Hardware Flow Control, Automatic Xon/Xoff and Special Character

Software Flow Control, infrared encoder and decoder (IrDA ver 1.0 and 1.1), programmable fractional baud

rate generator with a prescaler of divide by 1 or 4, and data rate up to 16 Mbps. The XR16M770 can operate

from 1.62 to 3.63 volts. The M770 is fabricated with an advanced CMOS process.

Larger FIFO

The M770 provides a solution that supports 64 bytes of transmit and receive FIFO memory, instead of 16 bytes

in the XR16L580. The M770 is designed to work with high performance data communication systems, that

requires fast data processing time. Increased performance is realized in the M770 by the larger transmit and

receive FIFOs, FIFO trigger level control and automatic flow control mechanism. This allows the external

processor to handle more networking tasks within a given time. For example, the XR16L580 with a 16 byte

FIFO, unloads 16 bytes of receive data in 1.53 ms (This example uses a character length of 11 bits, including

start/stop bits at 115.2Kbps). This means the external CPU will have to service the receive FIFO at 1.53 ms

intervals. However with the 64 byte FIFO in the M770, the data buffer will not require unloading/loading for 6.1

ms. This increases the service interval giving the external CPU additional time for other applications and

reducing the overall UART interrupt servicing time. In addition, the programmable FIFO level trigger interrupt

and automatic hardware/software flow control is uniquely provided for maximum data throughput performance

especially when operating in a multi-channel system. The combination of the above greatly reduces the CPU’s

bandwidth requirement, increases performance, and reduces power consumption.

Data Rate

The M770 is capable of operation up to 16 Mbps at 3.3V with 4X internal sampling clock rate. The device can

operate at 3.3V with a 24 MHz crystal on pins XTAL1 and XTAL2, or external clock source of 64 MHz on XTAL1

pin. With a typical crystal of 14.7456 MHz and through a software option, the user can set the prescaler bit and

sampling rate for data rates of up to 3.68 Mbps.

Enhanced Features

The rich feature set of the M770 is available through the internal registers. Automatic hardware/software flow

control, programmable transmit and receive FIFO trigger levels, selectable baud rates, infrared encoder/

decoder, modem interface controls, and a sleep mode are all standard features. MCR bit-5 provides a facility

for turning off (Xon) software flow control with any incoming (RX) character. The M770 includes new features

such as 9-bit (Multidrop) mode, auto RS-485 half-duplex direction control, different baud rate for TX and RX,

fast IR mode and fractional baud rate generator.

XR16M770IL32-0A-EB Related Products

	XR16M770IL32-0A-EB	XR16M770IL32-F	XR16M770IL24-0C-EB
Description	interface development tools eval board for xr16m770il32 series	uart interface IC 1.8 high performance uart W/64	interface development tools eval board for xr16m770il24 series
Manufacture	Ex	Ex	Ex
Product Category	Interface Development Tools	UART Interface IC	Interface Development Tools
RoHS	Yes	Yes	Yes

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