While it delivers 900 mA amount of power. While USB 3.0 cable length can be up to three meters. USB 2.0 cable length can be up to five meters. While USB 3.0 is a two-way communication. While data transmission rate of USB 3.0 is 4800 Mbps. So, in this article, we will discuss the difference between USB 2.0 and USB 3.0.ĭifference between USB 2.0 and USB 3.0: S.NOĭata transmission rate of USB 2.0 is 480 Mbps. USB 2.0 and USB 3.0 are the ones that are majorly used in the Computer Systems and Laptops. It is almost two times faster than the USB 3.0 and can transfer the data at the rates of up to 10 Gigabits per second. USB 3.1 is the latest version of the USB protocol. USB 3.1: It is also known as SuperSpeed+, and it was introduced in 2013.It supports the data transfer rate of 5 Gigabits per second, which is much much faster than the speed provided by USB 2.0. It is a much-improved version of USB 2.0. USB 3.0: it is also known as SuperSpeed USB and was first made available in November 2009.
However, practically it is approximately 280 Mbps. It is capable to deliver the maximum transfer speed of 480 Megabits per second. It is an updated version of USB 1.1, which provides improved functionalities and better speed. USB 2.0: it is also known as hi-speed USB.USB 1.x: It is an external bus standard that can capable of data transfer with the speed of 12 Megabits per second and can support up to 127 peripheral devices.Web Caching and Conditional GET Statements.Computer Network | Quality of Service and Multimedia.Multipurpose Internet Mail Extension (MIME) Protocol.Simple Network Management Protocol (SNMP).What’s difference between The Internet and The Web ?.Types of DNS Attacks and Tactics for Security.Address Resolution in DNS (Domain Name Server).If youre looking for a USB cable capable of high speed data transfer rates, make sure its USB 3.0 or higher, regardless of the connector type. Domain Name System (DNS) in Application Layer Since the USB-C connector works on any USB cable, including USB 2.0, marketers of cheaper USB cables sell cables marketed as 'USB-C', leaving the USB 2.0 specification in small print.Network Devices (Hub, Repeater, Bridge, Switch, Router, Gateways and Brouter).Difference between WiFi Repeater and WiFi Extender.Difference between WiFi Extender and WiFi Booster.Difference between USB Tethering and Mobile Hotspot.ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.
Then, you'll get more speed, twice more or so.Īlone ping-pong mode gives no speed up, as long as you read/write packet by packet on the PC app. In addition to above transfer size, enable ping-pong mode with double buffer size (128 bytes). No data loss occurs.įor the opposite direction, host waits for your firmware to pass packets forever, unless your PC app cancels the Read call, or timeout occurs, if any.Įven with single 64 bytes buffer, greater transfer size on PC app speeds up the transfer 5-10 times. While you are processing a packet, host retries to send the next packet, until it is accepted by your device. Process packet by packet, as you are doing now.Īs USB has intrinsic hardware flow control (NAK flow control), you don't need to worry about flow control on your firmware. You don't need to assign a large buffer on the device side.Ī buffer of full-packet size (64 bytes) is enough. I'll see if I can find enough RAM to store a larger segment of the data at the same time. WinUSB will accepts 18,000 packets (1.2 MB) in single call. The max size of single transfer depends on the device driver. Writing 1024 bytes on the PC in single transfer, your device will see 16 full-size packets (64 bytes). In the opposite direction, you may apply similar way. the overhead of Read is cut off as the whole.
In this way, the number of Read calls decreases, ie. The packets are gathered into single transfer on the host controller, and it is passed to the Read call. The device sends 64 bytes packets 16 times (64 x 16 = 1024). To speed up the transfer, request greater size in Read call on the PC side.įor example, Read requests 1024 bytes in single call. It sounds like reasonable figure, because synchronous Read and Write call on the PC side takes overhead of 2-3 ms each, to synchronize to 1ms USB frame. Running this as fast as I can, I get a transfer rate (from the PC to the PIC) of about 10 KBytes/Sec.ġ0 KBytes/Sec of 64 byte packet means about 1 packet / 6.4 ms.ġ round trip takes about 6 ms. I send a 64 byte packet and I get one in return.