Split bus operation - universal serial bus , Computer Engineering

Split Bus Operation - universal serial bus :

 

234_Split Bus Operation.png

USB 2.0 devices utilize a special protocol in the reset time that is called "chirping", to negotiate the high speed mode having the host/hub. A component that is HS capable first connects as an FS components (D+ pulled high), but upon retaining a USB RESET (both D+ and D- driven LOW by host for 10 to 20 mS) it pulls the D- line high which is known as chirp K. it indicates to the host that the device is high speed. If the host/hub is also HS capable then it chirps (returns alternating K and J states on D+ and D- lines) letting the components know that the hub will operate at high speed. The device has to retain at least 3 sets of KJ chirps before it changes to high speed terminations and start high speed signaling. Because USB 3.0 use wiring separately and in additional to that used by USB 2.0 and USB 1.x  that type of speed negotiation is not needed. Clock tolerance power is 480.00 Mbit/s ±500 ppm, 12.000 Mbit/s ±2500 ppm, 1.50 Mbit/s ±15000 ppm.

While high speed components are commonly referred to as "USB 2.0" and advertised as "up to 480 Mbit/s", not all USB 2.0 are high speed components. The USB-IF certifies devices and provides licenses to use special marketing logos for either high speed or basic speed (low and full) after passing a compliance test and paying a licensing fee. All of the devices are tested according to the latest specification, so newly-compliant low speed devices are also 2.0 devices.

Posted Date: 10/13/2012 7:45:05 AM | Location : United States







Related Discussions:- Split bus operation - universal serial bus , Assignment Help, Ask Question on Split bus operation - universal serial bus , Get Answer, Expert's Help, Split bus operation - universal serial bus Discussions

Write discussion on Split bus operation - universal serial bus
Your posts are moderated
Related Questions
What do you mean by complexity of an algorithm? The term complexity is used to define the performance of an algorithm. Typically performance is calculated in terms of time or s

What is write miss? During the write operation if the addressed word is not in cache then said to be write miss.

Q. F' (A, B, C, D) = (A + B + D')(A + C' + D')(A + B' + C')        D' (A, B, C, D) = (A + B' + C + D')(A' + C' + D')(A' + B + D)        Find the simplified function F and imple

Distortion caused on telephone line by an adjacent one is called (A) Cross Fire                      (B) Inductive Disturbance (C)  Cross Talk                     (D) Non

Address 192.5.48.3 belongs to? Address 192.5.48.3 belongs to class C.

Granularity Granularity refers to the quantity of computation done in concurrent relative to the size of whole program. In concurrent computing, granularity is a qualitative me

Stack is a portion of RAM used for saving the content of Program Counter and common purpose registers. LIFO stacks, also called as "push down" stacks, are the conceptually easi

Q. Connection Machine FORTRAN? Connection Machine Fortran was a subsequent SIMD language developed by Thinking Machines Corporation. Connection Machine Fortran incorporated all

Describe the purpose and operation of Register 2 (R2) for the MSP430

IS strategy - Information System As an operations manager when attempting to navigate your organisation through the information landscape and make best use of the available sy