ST AN2271 Application note

AN2271

APPLICATION NOTE

Ekey-Udisk solution

Introduction

This document describes a firmware implementation for an Ekey-Udisk device based on ST72651.

The software is divided into 3 parts:

●USB management: the main USB operations are managed by a USB library with USB hardware, which is not the focus in this documentation. For further information on this subject, please refer to the ST7 USB software library documentation.

●NAND Flash interface: this part software is migrated from PFD solution. How to implement it is not mentioned in this documentation.

●Smart Card interface: this interface is implemented by timer and accords ISO7816-1, 2, 3.

December 2005

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System Structure	AN2271

1	System Structure
		PC SIDE		DEVICE SIDE
		PC Application Software calls 2		Full Speed USB Lib
		interfaces through different driver		(Based on ST7 chip)

Process HID

Protocol

HID Interface

Mass Storage

Ekey Function

Interface

Udisk Function

Microsoft HID

Microsoft Mass

Storage driver

driver

Process APDU

Process BOT

Protocol

RBC Protocol

		ISO 7816		NAND Flash
Microsoft USB driver				Plugin

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AN2271	System Diagram

2 System Diagram

Main

Polling USB event

No

New HID data received?

Yes

Parse APDU Request.

Set ETU timer interrupt.

Start communication with smart card.

	APDU		No
	transaction is
	on-going?
		Yes
	APDU		No
	transaction has
	finished?

Yes

Send back APDU result

New	No	Flash	No
BOT package		operation has
received?		finished?
Yes		Yes
Flash operation		Send back BOT status

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