Copyright © 2014 Future Technology Devices International Limited

4

Document No.: FT_000646

FT120 USB DEVICE CONTROLLER WITH PARALLEL BUS IC

Datasheet Version 1.2

Clearance No.: FTDI#

291

Table of Contents

1

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

1.1

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

1.2

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

2

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

3

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

3.1

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

3.2

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

3.3

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

4

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

4.1

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

4.2

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

5

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

6

Commands and Registers ........................................................... 13

6.1

Command Summary.......................................................................... 13

6.2

Initialization Commands ................................................................... 14

6.2.1

Set Address Enable .................................................................................................... 14

6.2.2

Set Endpoint Enable ................................................................................................... 14

6.2.3

Set Mode .................................................................................................................. 15

6.2.4

Set DMA ................................................................................................................... 16

6.3

Data Flow Commands ....................................................................... 18

6.3.1

Read Interrupt Register .............................................................................................. 18

6.3.2

Select Endpoint ......................................................................................................... 19

6.3.3

Read Last Transaction Status ...................................................................................... 19

6.3.4

Read Endpoint Status ................................................................................................. 20

6.3.5

Read Buffer............................................................................................................... 21

6.3.6

Write Buffer .............................................................................................................. 21

6.3.7

Clear Buffer .............................................................................................................. 22

6.3.8

Validate Buffer .......................................................................................................... 22

6.3.9

Set Endpoint Status ................................................................................................... 22

6.3.10

Acknowledge Setup ................................................................................................ 22

6.4

General Commands........................................................................... 23

6.4.1

Read Current Frame Number....................................................................................... 23

6.4.2

Send Resume ............................................................................................................ 23

7

Reference Schematic .................................................................. 24

8

Devices Characteristics and Ratings ........................................... 25

8.1

Absolute Maximum Ratings............................................................... 25

8.2

DC Characteristics............................................................................. 26