4-Port USB KVM Switch SoC

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KVM (short for Keyboard, Video, and Mouse) is a hardware and software technology solution that allows you to control multiple computers from one set of peripherals. Compared with the legacy 4-port USB KVM switch using 12 chips (including one MCU, four USB device MCUs, one USB root hub, four EEPROMs and two bus switches), the AX68004 is a highly integrated single chip and low-cost solution ideally suitable for cable/desktop KVM Switch and KVM extender applications.

Compared with legacy chipset solution, the advantages of AX68004 single chip solution are: power management unit with deep sleep mode, manufacture driver for USB device in console is transparent to computers, same mouse sample rate on PC and device sides, integrating DDC (Display Data Channel) Emulation and EDID (Extended Display Identification Data), supporting four USB downstream ports in console, up to 7 USB devices in console (HID, Hub, MSC, Audio), and supporting touch screen, touch pad, and writing pad.


● Single chip microcontroller with 4-Port USB KVM Switch
● CPU for Application
-- 8-bit pipelined RISC, single cycle per instruction operating up to 96MHz and 100% software compatible with standard 8051/80390
-- Supports power management unit with deep sleep mode, programmable watchdog timer, three 16-bit timer/counters, and millisecond timer
-- Supports CPU Debugger for connecting to In-Circuit Emulation (ICE) adaptor
-- Supports DMA Controller (7 DMA channels) and memory arbiter for fast data movement during USB protocol stack processing and peripheral communications
-- 1 external interrupt sources with 2 priority levels
● Program/Data and Flash Memory
-- On-chip 8KB SRAM for CPU program code mirroring
-- Supports In-System Programming (ISP) for initial Flash memory programming via UART or ICE adaptor
-- Supports reprogrammable boot code and In-Application Programming (IAP) to update boot code or run-time firmware through USB or UART interface
-- On-chip 32KB data memory for CPU and packet buffering
-- On-chip 128KB Flash memory for CPU program code
-- On-chip 1KB Flash Information Page for Hardware Configuration
-- Supports Page architecture for flash erase
-- Minimum 100,000 flash program/erase cycles
-- Minimum 10 years flash data retention
● USB Interfaces
-- Supports 4 multi-addressable Device Controllers and compliant with USB Spec 2.0 Full speed
-- Build-in one USB host controller and one USB root hub that supports four downstream ports and each compliant with USB2.0 Full/Low speed
-- Supports Control, Bulk, Interrupt, and Isochronous transfer types
-- Supports controllable D+ pull-up resistance for upstream ports
-- Supports controllable D+/- pull-down resistance for downstream ports
-- Supports Burst mode transfer for BULK data transfer in Device Controller
-- Supports the downstream SOF synchronization with selected upstream port for ISO data transfer automatically
● Peripheral Communication Interfaces
-- 2 UART interface (1 supporting DMA mode, Modem control, remote wake-up and up to 921.6Kbps baud)
-- 2 High Speed SPI interface with DMA mode (1 master and 1 slave mode)
-- 5 I2C interface with DMA mode (1 master with EDID Console and 4 slave mode with EDID Slave)
-- 2 PS/2 Host interfaces
-- Up to 4 GPIO ports of 8 bits each (Supports 2 GPIO ports with de-bounce and interrupt function)
-- Programmable Buzzer function
● Supports KVM switch functions in software
-- Controls 4 computers from a single console
-- Supports PS/2 keyboard/mouse and USB keyboard/mouse
-- Supports keyboard and mouse emulation for error-free booting
-- USB device in console is transparent to computers that support most gaming/multimedia keyboards and multifunction mouse
-- Mouse sample rate on both of downstream and upstream ports is the same
-- Supports DDC (Display Data Channel) emulation and stores the console monitor’s EDID (Extended Display Identification Data)
-- Four computers can share four USB downstream ports in console
-- Supports maximum 7 USB devices in console, including HID, HUB, MSC and Audio Class
-- Supports touch screen, writing pad, and touch pad devices
-- Supports “push buttons” and “hot keys” switching
-- Supports auto-scan mode for monitoring PC operation
● Integrates on-chip oscillator and 96MHz PLL to operate with external 12MHz crystal
● Integrates on-chip power-on reset circuit
● 100-pin LQFP RoHS compliant package
● Operating temperature range: 0 to +70°C

Target Applications

● SOHO KVM Switch:
-- 4-port Cable KVM Switch
-- 4-port Desktop KVM Switch
○ Basic USB KVM Switch
○ Basic PS/2 KVM Switch
○ USB KVM Switch with Audio and USB Hub
-- KM Switch for Tablet and Smartphone
-- PC over LAN (Ethernet/Wi-Fi)
-- PC over HDBaseT 1.0
● Enterprise KVM Switch:
-- 8/16/32-port KVM Switch
-- VGA KVM Extender
-- Cat 5 KVM Switch

 ASIX Single Chip USB KVM Switch Solutions Introduction
ASIX Single Chip USB KVM Switch Solutions Introduction
AX6800x Android Gaming Phone Dock Solution Demo
AX6800x Android Gaming Phone Dock Solution Demo


Development Board


AX68004 Development Board

This is a generic 4-port KVM Switch Development Board for AX68004.



Development Kit

AX6800x Development Kit

Technical Documentation

Product Brief, Product Introduction and Datasheet

AX68004 Product Brief

Release Date

File Size
306.8 KB

AX6800x Product Introduction


Release Date

File Size
1.2 MB

AX6800x Datasheet


Release Date

File Size
1.6 MB

Reference Manuals and User Guides

AX6800x KVM Switch Development Kit User Guide


Release Date

File Size
1.4 MB

AX680xx CPU Core Instructions Set User Guide

AX6800x KVM SW Developer Guide

AX6800x KVM Extender SW Developer Guide


AX6800x Reliability Report

AX68004 LF RoHS Report

Hardware Design Documentation

Reference Schematics

AX68004 Development Board Reference Schematic


Release Date

File Size
478.6 KB

Bill of Materials, Application Notes and Layout Guides

AX68004 Development Board BOM File


Release Date

File Size
196.5 KB

AX6800x USB KVM SoC Application Design Note


Release Date

File Size
670.5 KB

PCB Layout, Gerber and IBIS Model

AX68004 Development Board PCB Layout File (PowerPCB)


Release Date

File Size
1.1 MB

AX68004 Development Board Gerber Files


Release Date

File Size
2.8 MB

AX68004 IBIS Model

Release Date

File Size
3.6 KB

Software & Tools

Demo Firmware

AX6800x Boot Loader Binary Code

AX6800x 2/4-port KVM Switch Demo Firmware Binary Code

AX6800x KVM Extender Transmitter Demo Firmware Binary Code

AX6800x KVM Extender Receiver Demo Firmware Binary Code


AX6800x Windows ISP tool

AX6800x KVM Switch IAP Utility

AX6800x KVM SysConfig Edition