AT43USB370 datasheet(2/50 Pages) ATMEL

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AT43USB370

3340B–USB–12/03

The AT43USB370 communicates with the external system processor through its generic

32-bit host processor interface. This system interface contains 2 Kbytes of FIFO and a DMA

engine designed to ensure maximum bus utilization. The automatic USB retry mechanism

minimizes data traffic across the system interface.

As a function, the AT43USB370 operates in full-speed mode. It supports one control endpoint

and a maximum of six programmable (maximum packet size and endpoint type) endpoints.

The internal USB controller runs the function firmware that manages USB enumeration and

data flow control without system processor intervention.

Communication between the AT43USB370 firmware and applications resident in the system

processor is realized through a small set of ANSI C compliant, system interface Application

Protocol Interfaces (APIs). This API set encapsulates the complete USB functionality. It is

used as the basic building blocks for constructing application specific USB device drivers of

any type.

The AT43USB370, with its highly integrated USB hardware/firmware architecture, not only

hides the complexity of the traditional USB design, but also frees system resources from being

burdened by timing critical USB activities. It is an ideal solution for point-to-point USB connec-

tivity in the resource constrained embedded environment.

Configuration

Figure 1. AT43USB370 100-lead LQFP

CS_N

OE_N

SELECT

INTR_IN

INTR_OUT

VDD

VSS

VDD18

PROG

READY

DONE

BUSY

WAIT_N

WE_N

DREQ_N

VSS

D20

D21

D22

D23

VDD

D24

D25

D26

D27

VSS

D28

D29

D30

D31

VDD18

VSS

SCAN_EN

RCV_DATA

DCLK

TRST_N

VSS

VDD

AT43USB370 Datasheet(PDF) 2 Page - ATMEL Corporation

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