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AX6800x

2/4-Port USB KVM Switch SoC

Copyright © 2015 ASIX Electronics Corporation. All rights reserved.

Table of Contents

1.0

INTRODUCTION................................................................................................................................... 12

1.1 GENERAL DESCRIPTION ............................................................................................................................... 12

1.2 PRODUCT SELECTION GUIDE........................................................................................................................ 12

1.3 AX6800X BLOCK DIAGRAM ........................................................................................................................ 13

1.4 AX6800X PINOUT DIAGRAM ....................................................................................................................... 14

1.5 SIGNAL DESCRIPTION................................................................................................................................... 16

2.0

FUNCTION DESCRIPTION................................................................................................................. 23

2.1 CLOCK GENERATION.................................................................................................................................... 23

2.2 RESET GENERATION..................................................................................................................................... 23

2.3 CPU CORE AND DEBUGGER......................................................................................................................... 24

2.3.1 CPU Core............................................................................................................................................. 24

2.3.2 Debugger.............................................................................................................................................. 24

2.4 FLASH CONTROLLER AND ON-CHIP FLASH MEMORY .................................................................................. 25

2.4.1 Program Loader................................................................................................................................... 25

2.4.2 Flash Controller and In-Application Programming ............................................................................ 25

2.4.3 In-System Programming....................................................................................................................... 25

2.4.4 On-Chip Flash Memory ....................................................................................................................... 25

2.5 MEMORY CONTROLLER AND ON-CHIP DATA MEMORY............................................................................... 26

2.6 DMA CONTROLLER ..................................................................................................................................... 26

2.7 INTERRUPT CONTROLLER............................................................................................................................. 26

2.8 WATCHDOG TIMER ...................................................................................................................................... 26

2.9 POWER MANAGEMENT UNIT........................................................................................................................ 27

2.10 TIMERS AND COUNTERS............................................................................................................................. 27

2.11 UARTS ...................................................................................................................................................... 27

2.12 GPIOS........................................................................................................................................................ 28

2.13 BUZZER CONTROLLER................................................................................................................................ 28

2.14 I2C CONTROLLER ...................................................................................................................................... 28

2.15 HIGH SPEED SPI CONTROLLER .................................................................................................................. 28

2.16 PS/2 CONTROLLER ..................................................................................................................................... 29

2.17 USB ROOT HUB AND HOST CONTROLLER ................................................................................................. 29

2.18 USB DEVICE CONTROLLER........................................................................................................................ 29

3.0

MEMORY MAP DESCRIPTION ......................................................................................................... 30

3.1 HARDWARE CONFIGURATION WITH FLASH INFORMATION MEMORY MAP................................................... 30

3.1.1 Flag (0x00)........................................................................................................................................... 31

3.1.2 Multi-function Pin Setting (0x03 ~ 0x01) ............................................................................................. 31

3.1.3 Programmable USB Pull Disable (0x04) ............................................................................................. 36

3.1.4 Reserved (0x05).................................................................................................................................... 36

3.2 PROGRAM MEMORY MAP ............................................................................................................................ 37

3.3 EXTERNAL DATA (XDATA) MEMORY MAP ................................................................................................ 37

3.4 INTERNAL DATA MEMORY AND SFR REGISTER MAP .................................................................................. 38

4.0

ELECTRICAL SPECIFICATION........................................................................................................ 39

4.1 DC CHARACTERISTICS ................................................................................................................................. 39

4.1.1 Absolute Maximum Ratings.................................................................................................................. 39

4.1.2 Recommended Operating Condition .................................................................................................... 39

4.1.3 Leakage Current and Capacitance ...................................................................................................... 39

4.1.4 DC Characteristics of 3.3V with 5V Tolerant I/O Pins........................................................................ 40

4.1.5 USB Transceivers Specification ........................................................................................................... 41

4.2 POWER CONSUMPTION ................................................................................................................................. 42

4.3 POWER-ON-RESET (POR) SPECIFICATION ................................................................................................... 43

4.4 POWER-UP/-DOWN SEQUENCE...................................................................................................................... 44

4.5 AC TIMING CHARACTERISTICS .................................................................................................................... 46

4.5.1 Clock Input Timing Specification ......................................................................................................... 46