Implementing an Eight-to-One U

Implementing an Eight-to-One USB Switch for KVM Applications

Abstract: Many servers need to be able to switch video, keyboard, mouse, and perhaps audio signals from one of several computers to a front panel. This application note focuses on the keyboard/mouse portion, and presents a circuit for implementing an 8:1 USB switch with the MAX4999. By placing a hub at the MAX4999 output, the design ensures that anything connected to the hub will be slaved to only one source.

Introduction

Users often need to access data through the front panel of a server chassis, requiring that the server be able to switch between multiple channels. Maxim offers several devices such as the MAX4999 to make this application easier to accomplish and more reliable.

The MAX4999 is a single-chip device that can multiplex a single USB common terminal to as many as eight USB channels at data rates up to 480Mbps (USB 2.0). This device features rail-to-rail signal handling for compatibility with low- and full-speed applications and bandwidth in excess of 900MHz to handle high-speed signals.

Keyboard/Mouse Switching Circuit

Although it is possible to switch PS-2 signals to support the keyboard/mouse requirement, PS-2 keyboard/mouse use is waning. USB is so much more useful and, thus, has virtually replaced PS-2 as the preferred protocol for keyboard and mouse applications. Therefore, this article will focus on the USB keyboard/mouse.

Figure 1 illustrates a circuit for implementing an 8:1 USB switch to support keyboard/mouse switching. If one USB port is switched from each of the eight sources, there will be a switched high-frequency pair coming from one of the eight sources to the MAX4999 common pins. One USB port will have enough bandwidth to handle the keyboard, mouse, and most common USB devices. The keyboard and mouse will most likely operate at low-speed USB.

The MAX4999 simply needs a 3-bit address, and another single bit if the enable pin (EN) is used. By selecting a 3-bit address, a single MAX4999 can connect one of eight pairs to its common pair. The fourth bit is wired to the EN pin and used to set the device into high-impedance state (standby mode), in which it consumes ≤ 3μA. A DIP switch will be assumed for selecting a particular source, but a microcontroller would likely be used for a production environment.

Figure 1. By placing a hub at the MAX4999 output, this design ensures that anything connected to the hub will be slaved to only one source.

Power for the MAX4999 needs to come from a 3.3V source. It is assumed that a 5.0V power supply capable of 2.0A or more will be available. This supply will be used to deliver the minimum current needed for the MAX4999 through an LDO, and to supply current for the (4-port) hub. The current-handling portion of the hub will take care of supplying limited current to each of the hub’s four ports.

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2018-07-06 01:13:00

3880

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MEET.ONE 團隊在 DAPP 智能合約開發(fā)、錢包開發(fā)、節(jié)點部署等多個方向積累了豐富的行業(yè)與技術(shù)經(jīng)驗。MEET.ONE 側(cè)鏈宗旨在于擴充 EOS 生態(tài)，降低 EOS 使用門檻和成本，同時賦能側(cè)鏈 DApp 訪問主網(wǎng)資源。

2019-01-18 11:16:46

2210

Xbox One上的VR隕落等待無線VR技術(shù)成熟

早前就曾預(yù)測，Xbox One上的VR可能要涼了（《在Xbox One X上使用VR還有戲嗎？》《Xbox One X上玩VR看來要涼了》），同時微軟也表示將VR重點放在Windows上。

2019-06-19 16:49:03

1036

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首先，技術(shù)參數(shù)不同F(xiàn)LIR ONE Pro擁有更寬的溫度量程能夠測量介于-20°至400°C之間的溫度FLIR ONE Pro支持至多三個點測溫和至多六個溫度感興趣區(qū)域提供更強的隨身圖像分析與報告功能。

2019-08-15 16:09:51

6928

信步科技SCM-6100U嵌入式主板介紹

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2019-10-09 15:50:35

2162

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2020-03-11 15:56:45

3254

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One Hyper是摩托羅拉中端One系列中的最新款手機，該系列手機各有一些特殊的攝像功能，例如極限微距模式或旋轉(zhuǎn)動作攝像頭。這個有很多百萬像素。

2020-12-18 16:37:59

2998

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2021-01-27 10:47:46

6635

LTC6993: One Shot

LTC6993: One Shot

2021-02-03 16:42:33

One Hundred And Eighty Decisions

One Hundred And Eighty Decisions

2021-02-04 10:22:10

DIY PCB RC ONE鍵盤MX

電子發(fā)燒友網(wǎng)站提供《DIY PCB RC ONE鍵盤MX.zip》資料免費下載

2022-08-02 11:38:38

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2022-09-07 15:28:51

1526

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FPGA芯片實現(xiàn)V-by-One的收發(fā)，同時例化V-by-One 及SerDes IP即可實現(xiàn)V-by-One通信。由于SerDes和V-by-One是分開的，所以頻率可在要求范圍內(nèi)靈活調(diào)整, 同時FPGA內(nèi)部還可以進行OSD疊加等處理并控制其他外設(shè)，從而充分利用FPGA資源。

2022-11-18 11:02:36

3819

帶linkit ONE的Grove串行相機

電子發(fā)燒友網(wǎng)站提供《帶linkit ONE的Grove串行相機.zip》資料免費下載

2022-12-26 10:07:04

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2023-01-03 09:45:10

1177

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V-by-One線技術(shù)作為一種高速、高效的數(shù)字信號傳輸接口，在顯示及視頻傳輸領(lǐng)域發(fā)揮著重要作用。雙品電子專業(yè)生產(chǎn)V-by-One線技術(shù)的原理、特點，深入探討其在各類顯示設(shè)備及相關(guān)系統(tǒng)中的應(yīng)用，并對其

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