IOBUS11 datasheet(21/88 Pages) FTDI

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Datasheet

Vinculum-II Embedded Dual USB Host Controller IC

V ers ion 1 .7

Doc ument N o.: FT _000138 C learance N o.: FT DI# 1 43

4 Function Description

VNC2 is the second of FTDIs Vinculum family of Embedded USB host controller integrated circuit devices.

VNC2 can encapsulate certain USB device classes by handling the USB Host Interface and data transfer

functions using the in-built EMCU and embedded Flash memory. When interfacing to mass storage

devices, such as USB Flash drives, VNC2 transparently handles the FAT file structure using a simple to

implement command set. VNC2 provides a cost effective solution for introducing USB host ca pability into

products that previously did not have the hardware resources to do so.

VNC2 has an associated software development tool suite to allow users to create customised firmware.

4.1 Key Features

VNC2 is a programmable SoC device with a powerful embedded microprocessor core and dual USB

interfaces, large RAM and Flash capacity and the ability to develop and customise firmware using the

VNC2 Toolchain. VNC2 has an enhanced feature list over and above VNC1L; however the 48 pin LQFP

package is backward compatible with the VNC1L.

4.2 Functional Block Descriptions

The following paragraphs describe each function within VNC2. Please refer to the block diagram shown in

Figure 2.1

4.2.1 Embedded CPU

The processor core is based on FTDIs proprietary 16-bit embedded MCU architecture. The EMCU has a

Harvard architecture with separate code and data space.

4.2.2 Flash Module

VNC2 has 256k bytes (128k x 16-bits) of embedded Flash (E-FLASH) memory. No special programming

voltages are necessary for programming the on-board E-FLASH as these are provided internally on-chip.

4.2.3 Flash Programming Module

The purpose of the flash programmer module is to perform all necessary operations for programming the

flash, from general usage to first power on sequencing. This block is responsible for handling device

firmware upgrades which can be accessed by the debugger interface, a USB cable or Flash drive

interface.

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