USB complete fourth p7

... Inside USB Transfers Table 2-1: Each of the USB s four transfer types is suited for different uses 6TCPUHGT 6[RG %QPVTQN ... may define a format 38 Inside USB Transfers for a received series of bytes that contain a temperature reading and the time of the reading +PKVKCVKPI C 6TCPUHGT The USB 2.0 specification defines ... care whether the device uses USB or another interface For examp...

Ngày tải lên: 04/07/2014, 07:20

... Inside USB Transfers Table 2-1: Each of the USB s four transfer types is suited for different uses 6TCPUHGT 6[RG %QPVTQN ... may define a format 38 Inside USB Transfers for a received series of bytes that contain a temperature reading and the time of the reading +PKVKCVKPI C 6TCPUHGT The USB 2.0 specification defines ... care whether the device uses USB or another interface For examp...

Ngày tải lên: 04/12/2015, 02:02

...         USB 1.0 11 USB 1.1 12 USB 2.0 12 USB 3.0 ... Developers What USB Can’t Do USB versus Ethernet 10 USB versus IEEE-1394 ... %QORNGVG 6JG &GXGNQRGTŏU )WKFG (QWTVJ 'FKVKQP ,CP #ZGNUQP Lakeview Research LLC Madison, WI 53704 USB Complete: The Developer’s Guide, Fourth Edition by Jan Axelson Copyright 1999-2009 by Janet L

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 that...

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, ... compares USB with other interfaces 'CU[ VQ 7UG Ease of use was a major design goal for USB, and the result is an interface that’s a pleasure to use for many reasons: One interface for m...

Ngày tải lên: 04/07/2014, 07:20

... multiple functions For example, Figure 1-3 USB 2.0 hubs use high speed for upstream communications if the host and all hubs between are USB 2.0 or USB 3.0 18 USB Basics a device might provide both ... communicate with USB devices, a computer needs hardware and software that support the USB host function The hardware consists of a USB host controller and a root hub with one or mo...

Ngày tải lên: 04/07/2014, 07:20

... %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 parallel with a SuperSpeed bus Will USB 3.0 ... Can I use a USB 3.0 cable with a USB 2.0 host? Yes The USB 3.0 Standard-A plug fits the USB 2.0 Standard-A receptacle, so you can use a USB 3.0 cable to attach a U...

Ngày tải lên: 04/07/2014, 07:20

... optional A USB 2.0 hub may return NYET in a complete- split transaction Hosts and low- and full-speed devices never send NYET '44 The ERR handshake is for use only by high-speed hubs in complete- split ... device ACK, NAK, STALL, NYET (high speed only), ERR (from hub in complete split) IN device data, NAK, STALL, ERR (from hub in complete split) host ACK – device ACK, NAK, STALL PING...

Ngày tải lên: 04/07/2014, 07:20

... transactions 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 transactions 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 requires spe...

Ngày tải lên: 04/07/2014, 07:20

... data, a USB 2.0 device can take up to seconds to accept all of the data and complete the Status stage (though once begun, the Status stage must complete within 50 ms) USB 3.0 devices must complete ... USB requests and performing other infrequent configuration tasks This approach helps ensure that the transfers complete quickly by keeping the reserved bandwidth as open as possibl...

Ngày tải lên: 04/07/2014, 07:20

... only the information transferred in the data packet (USB 2.0) or Data Packet Payload (SuperSpeed), excluding PID and CRC bits USB 2.0 and USB 3.0 require interrupt endpoints in a default interface ... endpoint(s) Every USB 2.0 or USB 3.0 device with isochronous endpoints must have an interface that requests no isochronous bandwidth so the host can configure the Figure 3-7 USB 2.0 i...

Ngày tải lên: 04/07/2014, 07:20

... attempts to enumerate the device by issuing control transfers containing standard USB requests to the device All USB devices must support control transfers, the standard requests, and endpoint ... the host in response to the next Get Port Status request A USB 1.x hub may instead detect the device’s speed just after a bus reset USB 2.0 requires speed detection before the reset so the h...

Ngày tải lên: 04/07/2014, 07:20

... bits are tenths, and the final four bits are hundredths USB 1.1 is 0110h (not 0101h) USB 2.0 is 0200h USB 3.0 is 0300h A device with bcdUSB = 0210h or higher must support the BOS descriptor A ... standard USB descriptors The device must store the contents of its descriptors and respond to requests for the descriptors 6[RGU Table 4-1 lists the descriptors defined in the USB 2.0 and...

Ngày tải lên: 04/07/2014, 07:20

... with the device speed and type of transfer For USB 2.0, bits 10 are the maximum packet size with a range of 0–1024 For USB 1.x, the range is 0–1023 In USB 2.0, bits 12 11 indicate how many additional ... way to provide this information, the Wireless USB specification introduced two new descriptor types The USB 2.0 Link Power Management Addendum and USB 3.0 specification also incor...

Ngày tải lên: 04/07/2014, 07:20

... followed by a ZLP, the endpoint returns ACK to complete the transfer 5VCPFCTF 4GSWGUVU Table 5-1 summarizes the requests defined in the USB 2.0 and USB 3.0 specifications 124 Control Transfers: ... transactions 117 Chapter The descriptions below apply to USB 2.0 transfers SuperSpeed transfers exchange the same information but use USB 3.0’s packet structures and protocols as describe...

Ngày tải lên: 04/07/2014, 07:20