descriptor index not valid

Speaking of USB devices, we have to mention a variety of descriptors (descriptors), in general, descriptors are as follows: 1: Device Descriptor (Device descriptors) 2: Configuration descriptor (Configuration descriptors) 2: Interface Descriptor

The original link is: http://www.chinaunix.net/old_jh/23/483510.htmlArchitecture of protection methodsProblems:Register model of Protection modeDescription of Protection mode and page table entryStorage management and address translation of

Main content of this article:1. Basic Concepts: physical memory, virtual memory, physical address, virtual address, logical address, page directory, and page table2. Windows Memory Management3. CPU Memory Management4. CPU page-Based Memory

transferred from: http://blog.csdn.net/myarrow/article/details/82700291. What is an enumeration? Enumeration is to read some information from the device, know what device it is, how to communicate, so that the host can be based on this information

From: http://hi.baidu.com/ting160/blog/item/419ba1eb1bce7c38adafd574.html MMU: Memory Management Unit *Ing between virtual memory space and physical storage space. Page-based virtual memory management is adopted in arm. It divides the virtual

[-] 1. Control Register Protection Control bit Coprocessor control bit Cr2 AND Cr 3 2. system address register Global Descriptor Table register GDTR Local Descriptor Table register ldtr Interrupt Descriptor Table

  2 Index and Query Optimization Index type Ø normal index: This is the most basic index type and has no restrictions such as uniqueness. Ø unique index: It is basically the same as a normal index, but all index column values are unique. Ø primary

This article is the 12th chapter of the original book study notes.Say a digression, this post is to write, because let me mistakenly deleted, abominable is csdn in the Recycle Bin can not find! Well, then write it again, I have a strong will. Sima

Server-side scripting technology is a very useful thing, combining it with client script technology to create a very powerful page. It seems like a long time ago, which version (appears to be the WWW edition) discussed ASP to the point of full swing,

1, real mode, protection modeThere are two modes of CPU Startup: Real mode and protection mode Real mode: cannot use multithreading. You cannot implement a permission rating. You cannot access more than 20-bit address lines, which means you can