USB Complete fourth- P34 potx

Ngày tải lên: 04/07/2014, 07:20

... has had enough time to complete the transaction with the device, the host begins a complete- split transaction with the hub. In a complete- split transaction, the host sends a complete- split token ... receiving high-speed data, so USB 2.0 hubs don’t repeat high-speed traffic to these devices, including USB 1.x hubs. &GVGEVKPI&GXKEG5RGGF On attachment, every USB 2.0 devic...

Ngày tải lên: 04/07/2014, 07:20

... NET2272 . . . . . . . . . . . . . . . . . . . . . . . . . 157 FTDI USB UART and USB FIFO. . . . . . . . . . . . . . . . . . . . 159 USB Complete: The Developer’s Guide, Fourth Edition by Jan Axelson Copyright ...  Microchip PIC18F4550 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Cypress EZ -USB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 AR...

Ngày tải lên: 04/07/2014, 07:20

... should use a USB interface? Find out whether your device should use USB or another interface. If the choice is USB, you’ll learn how to decide which of USB s four speeds—including USB 3.0’s SuperSpeed—and ... other USB devices? Find out how to develop a host for an embedded system or a USB On-The-Go device that can function as both a USB device and a limited-capability host tha...

Ngày tải lên: 04/07/2014, 07:20

... option with the release of USB 2.0, and USB 3.0 defined SuperSpeed. 4GNKCDNG USB s reliability is due to both the hardware and the protocols. The hardware specifications for USB drivers, receivers, ... flexibility built into the USB protocol, the support in the controller chips and operating system, and the support available from the USB Implementers Forum. 8GTUCVKNG USB s four tr...

Ngày tải lên: 04/07/2014, 07:20

... hub and embedded devices each have a unique address. A USB 3.0 hub is a special case. The hub contains both a USB 2.0 hub function and a USB 3.0 hub function. A composite device has one bus address ... or be hard-wired to peripheral circuits. For USB, each downstream-facing connector on a hub represents a USB port. Host applications can’t access USB ports directly but instead commu...

Ngày tải lên: 04/07/2014, 07:20

... a USB 2.0 speed. Can I use USB 3.0 cable with a USB 2.0 device? No. A USB 3.0 cable has a USB 3.0 Standard-B or USB 3.0 Micro-B plug, and these plugs don’t fit USB 2.0 receptacles. Inside USB ... stream. %QORCVKDKNKV[ USB 3.0 is backwards compatible with USB 2.0. Will USB 1.x and USB 2.0 devices work with USB 3.0 hosts? Yes. A USB 3.0 host has a USB 2.0 bus in pa...

Ngày tải lên: 04/07/2014, 07:20

... be exchanged. A transfer may take place over multiple frames or microframes, but each USB 2.0 transaction completes within a frame or microframe without interruption. No other packets on the bus ... 2-1. A USB 2.0 transfer consists of transactions. The transactions in turn contain packets, and the packets contain a packet identifier (PID) and sometimes additional information. Inside US...

Ngày tải lên: 04/07/2014, 07:20

... in complete split) IN device data, NAK, STALL, ERR (from hub in complete split) host ACK PING (high speed only) no data packet – device ACK, NAK, STALL Chapter 2 46 5RNKV6TCPUCEVKQPU A USB ... USB 2.0 hub communicates with a USB 2.0 host at high speed unless a USB 1.x hub is between the host and hub. When a low- or full-speed device is attached to a USB 2.0 hub, the hub co...

Ngày tải lên: 04/07/2014, 07:20

... transac- tions. To the device, the transaction is no different than a transaction with a USB 1.x host. The USB 2.0 or USB 3.0 hub nearest the device initiates transac- tions with the device and returns ... not the transfer has a Data stage, and if so, in which direction the data will travel. The USB 2.0 and USB 3.0 specifications define standard requests. Successful enumeration requ...

Ngày tải lên: 04/07/2014, 07:20