HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comment
RichQ
User Rank
Platinum
Re: Nov 26 - Day 1: Implementing USB in Embedded Products
RichQ   11/29/2012 8:31:32 PM
NO RATINGS
@gongji, the A and B connectors are to distinguish a host from an endpoint. The A connector plugs into a host and the B connector plugs into an endpoint. So, the cable between your PC and your printer has an A connector on the end going to the PC and a B connector going to the printer. This helps keep the signal polarities correct as well as preventing someone from trying to use the printer as a USB host.

In fact, I dont think any USB cable has the A connector on both ends. If it did, somone could really mess things up by trying to connect two hosts together.

Your flash drives have only an A connector because, in essence, the functional equivalent of the cable with its B-end is an integral part of the flash drive, so only the A end of the "cable" is actually used.



Partner Zone
Latest Analysis
With Radio Shack on the ropes, let's take a memory trip through the highlights of Radio Shack products.
We Have FPGAs with On-chip MCUs, but How About MCUs with On-chip FPGAs?
Polish design firm NAS-DRA has proposed parasitic robotic drones that capture carbon dioxide from the air during the day and release it at night to plants growing on their wings.
Computer security firm Norton has partnered with clothing company Betaband on a pair of jeans that will keep your RFID-tagged credit cards and documents safe from wireless theft.
With erupting concern over police brutality, law enforcement agencies are turning to body-worn cameras to collect evidence and protect police and suspects. But how do they work? And are they even really effective?
More:Blogs|News
Design News Webinar Series
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
12/10/2014 8:00 a.m. California / 11:00 a.m. New York
11/19/2014 11:00 a.m. California / 2:00 p.m. New York
11/6/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Dec 15 - 19, An Introduction to Web Application Security
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  67


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service