IOBUS0 datasheet(65/88 Pages) FTDI

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C opyright © Future T ec hnology Devic es I nternational Limited

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

7 USB Interfaces

VNC2 has two USB 1.1 and USB 2.0 compliant interfaces available either as a USB host or slave device

capable of supporting 1.5Mb/s (Low Speed) and 12Mb/s (full Speed) transactions. The USB specification

defines 4 transfer types that are all supported by VNC2:



Interrupt transfer: Used for legacy devices where the device is periodically polled to see if the

device has data to transfer e.g. Mouse, Keyboard. VNC2 interrupt transfers are valid for low - and

full-speed transactions.



Bulk transfer: Used for transferring large blocks of data that have no periodic or transfer rate

requirement e.g. USB to RS232 (FT232R device), memory sticks. VNC2 bulk transfers are only

valid for full-speed transactions.



Isochronous transfer: Used for transferring data that requires a constant delivery rate e.g. web

cam, wireless modem. VNC2 isochronous transfers are only valid for full-speed transactions.



Control transfer: Used to transfer specific requests to all types USB devices (most commonly

used during device configuration). VNC2 control transfers are valid for low - and full-speed

transfers.

USB 2.0 - 480Mb/s (High Speed) transactions are not supported as the power requirements are dee med

excessive for VNC2 target applications. VNC2 configured to Full speed is supported.

VNC2 has two main USB modes of operation: host mode or client (or Slave) mode. As a client, VNC2 is

able to connect to a PC and act as a USB peripheral. At the same time as being a client the second USB

interface is also able to act as a host and connect to a second USB device using two separate ports (i.e.

Port 0 – Host Port 1- Client). Each USB interface can be either a host or a client.

It is not possible to

change from host to client or client to host “on-the-fly”. The following diagrams in figure 7.1 give

examples of possible modes of operation:

VNC2

Port 1

Port 0

BOMS Flash Disk

USB Device

Port 0 and 1 in Host mode

VNC2

Port 1

Port 0

Port 0 in Slave mode

USB Host

VNC2

Port 1

Port 0

Port 0 in Slave mode and Port 1 in Host mode

USB Host

BOMS Flash Disk

VNC2

Port 1

Port 0

Port 0 and 1 in Slave mode (Null Modem type application)

USB Host

Figure 7.1 USB Modes

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