UM0290 datasheet(39/76 Pages) STMICROELECTRONICS

Part #	UM0290

Description	This document presents a description

PDF	76 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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UM0290

Mass storage demo

39/76

Figure 8.

Mass storage file architecture

This implementation uses the internal RAM like memory support. In fact the internal RAM is

divided into the following three different areas (see Figure 9):

●

General purpose memory area: this part of memory is used by the firmware to store

internal variables.

●

Medium memory area: this part of memory is dedicated to the user data. It is used to

store/read/write data from Windows.

●

Free area: this part of memory is not used.

Figure 9.

Internal RAM areas

Standard Lib

Commun

Files

Mass Storage Files

Standard Lib

USB Lib

Tools Files

Common

files

Simple Buffer

Transfer Mode

Double Buffer

Transfer Mode

Simple buffer transfer mode implementation

Double buffer transfer mode implementation

USB Mass Storage Application File

RAM

General purpose memory area

Medium memory area

Free memory area

UM0290 Datasheet(PDF) 39 Page - STMicroelectronics