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FT122: DescriptionFT122 ENHANCED USB DEVICE CONTROLLER WITH PARALLEL BUS IC Datasheet Version 1.1; File Size992KB，47 Pages; ManufacturerFTDI

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FT122 ENHANCED USB DEVICE CONTROLLER WITH PARALLEL BUS IC Datasheet Version 1.1

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Document No.: FT_000647

FT122 ENHANCED USB DEVICE CONTROLLER WITH PARALLEL

BUS

Datasheet Version 1.1

Clearance No.: FTDI#

313

Future Technology Devices

International Ltd

FT122

(Enhanced USB Device

Controller with Parallel Bus

IC)

The FT122 is a USB generic interface

controller with the following advanced

features:



USB 2.0 Full Speed compatible

High performance USB device controller with

integrated SIE, endpoint buffer, transceiver

and voltage regulators



Fully integrated clock generation

external crystal required

microcontroller



Supports DMA operation

Supports up to 8 bi-directional endpoints with

total 2K bytes endpoint buffer

Max packet size is 504 bytes for isochronous

endpoint and 64 bytes for control/bulk/

interrupt endpoint

Double

buffer

scheme

for

any

endpoint

increases data transfer throughput



Multiple interrupt modes to facilitate both bulk

and isochronous transfers



USB

Battery

Charger

detection

allowing



with



Dedicated clock output pin with programmable

clock frequency (4 – 24 MHz)

30 kHz output clock provided during suspend

Integrated

connection

USB connection indicator that toggles with USB

transmit and receive activities

Supports

applications



VCC power supply operation at 3.3V or 5V

Internal 1.8V and 3.3V LDO regulators

VCC IO level range from 1.8V to 3.3V

Integrated power-on-reset circuit

UHCI/OHCI/EHCI host controller compatible

-40°C to 85°C extended operating temperature

range

Available in Pb-free TSSOP-28 and QFN-28

packages (RoHS compliant)

bus-powered

self-powered

pull-up

resistor

for

USB

Supports 8-bit parallel interface to external



optimized charging profile

Neither the whole nor any part of the information contained in, or the product described in this manual, may be adapted or reproduced

in any material or electronic form without the prior written consent of the copyright holder. This product and its documentation are

supplied on an as-is basis and no warranty as to their suitability for any particular purpose is either made or implied. Future Technology

Devices International Ltd will not accept any claim for damages howsoever arising as a result of use or failure of this product. Your

statutory rights are not affected. This product or any variant of it is not intended for use in any medical appliance, device or system in

which the failure of the product might reasonably be expected to result in personal injury. This document provides preliminary

information that may be subject to change without notice. No freedom to use patents or other intellectual property rights is implied by

the publication of this document. Future Technology Devices International Ltd,

Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow

G41 1HH

United Kingdom. Scotland Registered Company Number: SC136640

Document No.: FT_000647

FT122 ENHANCED USB DEVICE CONTROLLER WITH PARALLEL

BUS

Datasheet Version 1.1

Clearance No.: FTDI#

313

Table of Contents

1.1

1.2

Typical Applications ...................................................................... 2

Part Numbers...................................................................................... 2

USB Compliant .................................................................................... 2

3.1

3.2

3.3

Block Diagrams ............................................................................ 3

Device Pin Out and Signal Description .......................................... 6

TSSOP-28 Package Pin Out ................................................................. 6

QFN-28 Package Pin Out ..................................................................... 6

Pin Description ................................................................................... 7

4.1

4.2

Function Description..................................................................... 9

Functional Block Descriptions ............................................................. 9

Interrupt Modes ................................................................................ 10

5.1

5.2

Endpoint Buffer Management ..................................................... 11

Endpoint Buffer Management in Default Mode .................................. 11

Endpoint Buffer Management in Enhanced Mode .............................. 12

6.1

6.2

Commands and Registers ........................................................... 14

Command Summary .......................................................................... 14

Initialization Commands ................................................................... 19

Set Address Enable .................................................................................................... 19

Set Endpoint Enable ................................................................................................... 19

Set Mode .................................................................................................................. 19

Set DMA ................................................................................................................... 21

Set Endpoint Configuration (for Enhanced Mode) ........................................................... 22

6.2.1

6.2.2

6.2.3

6.2.4

6.2.5

6.3

6.3.1

6.3.2

6.3.3

6.3.4

6.3.5

6.3.6

6.3.7

6.3.8

6.3.9

Data Flow Commands ....................................................................... 23

Read Interrupt Register .............................................................................................. 23

Select Endpoint ......................................................................................................... 25

Read Last Transaction Status ...................................................................................... 25

Read Endpoint Status ................................................................................................. 26

Read Buffer ............................................................................................................... 27

Write Buffer .............................................................................................................. 27

Clear Buffer .............................................................................................................. 27

Validate Buffer .......................................................................................................... 28

Set Endpoint Status ................................................................................................... 28

Acknowledge Setup ................................................................................................ 28

6.3.10

6.4

6.4.1

6.4.2

6.4.3

6.4.4

General Commands ........................................................................... 28

Read Current Frame Number ....................................................................................... 29

Send Resume ............................................................................................................ 29

Set Buffer Interrupt Mode ........................................................................................... 29

Read Vendor ID ......................................................................................................... 30

Document No.: FT_000647

FT122 ENHANCED USB DEVICE CONTROLLER WITH PARALLEL

BUS

Datasheet Version 1.1

Clearance No.: FTDI#

313

6.4.5

6.4.6

6.4.7

Read Product ID ........................................................................................................ 30

Read FTDI ID ............................................................................................................ 30

Set IO Pad Drive Strength........................................................................................... 30

8.1

8.2

8.3

Application Information ............................................................. 32

Devices Characteristics and Ratings ........................................... 33

Absolute Maximum Ratings............................................................... 33

DC Characteristics............................................................................. 34

AC Characteristics ............................................................................. 35

9.1

9.2

9.3

9.4

9.5

Package Parameters ................................................................... 39

TSSOP-28 Package Dimensions ........................................................ 39

TSSOP-28 Package Markings ........................................................... 40

QFN-28 Package Dimensions ............................................................ 41

QFN-28 Package Markings ............................................................... 42

Solder Reflow Profile ........................................................................ 42

Contact Information ................................................................... 44

Appendix A– References ............................................................................ 45

Appendix B - List of Figures and Tables ..................................................... 45

Appendix C - Revision History .................................................................... 47

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