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FT121T-U Datasheet(PDF) 4 Page - Future Technology Devices International Ltd. |
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FT121T-U Datasheet(HTML) 4 Page - Future Technology Devices International Ltd. |
4 / 46 page Copyright © 2014 Future Technology Devices International Limited 4 Document No.: FT_000648 FT121 ENHANCED USB DEVICE CONTROLLER WITH SPI SLAVE IC Datasheet Version 1.2 Clearance No.: FTDI# 312 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-16 Package Pin Out ................................................................. 6 3.2 QFN-16 Package Pin Out..................................................................... 6 3.3 Pin Description ................................................................................... 7 4 Function Description..................................................................... 9 4.1 Functional Block Descriptions ............................................................. 9 4.2 Interrupt Modes................................................................................ 10 4.3 SPI Slave Interface........................................................................... 10 4.3.1 4-wire write operation ................................................................................................ 11 4.3.2 4-wire read operation................................................................................................. 11 4.3.3 3-wire write operation ................................................................................................ 12 4.3.4 3-wire read operation................................................................................................. 12 5 Endpoint Buffer Management ..................................................... 14 5.1 Endpoint Buffer Management in Default Mode .................................. 14 5.2 Endpoint Buffer Management in Enhanced Mode .............................. 15 6 Commands and Registers ........................................................... 17 6.1 Command Summary.......................................................................... 17 6.2 Initialization Commands ................................................................... 22 6.2.1 Set Address Enable .................................................................................................... 22 6.2.2 Set Endpoint Enable ................................................................................................... 22 6.2.3 Set Mode .................................................................................................................. 22 6.2.4 Set Interrupt............................................................................................................. 24 6.2.5 Set Endpoint Configuration (for Enhanced Mode) ........................................................... 24 6.3 Data Flow Commands ....................................................................... 25 6.3.1 Read Interrupt Register .............................................................................................. 25 6.3.2 Select Endpoint ......................................................................................................... 27 6.3.3 Read Last Transaction Status ...................................................................................... 27 6.3.4 Read Endpoint Status ................................................................................................. 28 6.3.5 Read Buffer............................................................................................................... 29 6.3.6 Write Buffer .............................................................................................................. 29 6.3.7 Clear Buffer .............................................................................................................. 29 6.3.8 Validate Buffer .......................................................................................................... 29 6.3.9 Set Endpoint Status ................................................................................................... 30 6.3.10 Acknowledge Setup ................................................................................................ 30 |
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