nor and nand flash desc.
NORºÍNANDÊÇÏÖÔÚÊг¡ÉÏÁ½ÖÖÖ÷ÒªµÄ·ÇÒ×ʧÉÁ´æ¼¼Êõ¡£IntelÓÚ1988ÄêÊ×ÏÈ¿ª·¢³öNOR flash¼¼Êõ,³¹µ×¸Ä±äÁËÔÏÈÓÉEPROMºÍEEPROMһͳÌìϵľÖÃæ¡£½ô½Ó×Å,1989Äê,¶«Ö¥¹«Ë¾·¢±íÁËNAND flash½á¹¹,Ç¿µ÷½µµÍÿ±ÈÌصijɱ¾,¸ü¸ßµÄÐÔÄÜ,²¢ÇÒÏó´ÅÅÌÒ»Ñù¿ÉÒÔͨ¹ý½Ó¿ÚÇáËÉÉý¼¶¡£µ«ÊǾ¹ýÁËÊ®¶àÄêÖ®ºó,ÈÔÈ»ÓÐÏ൱¶àµÄÓ²¼þ¹¤³Ìʦ·Ö²»ÇåNORºÍNANDÉÁ´æ¡£
¡¡¡¡Ïà“flash´æ´¢Æ÷”¾³£¿ÉÒÔÓëÏà“NOR´æ´¢Æ÷”»¥»»Ê¹Óá£Ðí¶àÒµÄÚÈËÊ¿Ò²¸ã²»Çå³þNANDÉÁ´æ¼¼ÊõÏà¶ÔÓÚNOR¼¼ÊõµÄÓÅÔ½Ö®´¦,ÒòΪ´ó¶àÊýÇé¿öÏÂÉÁ´æÖ»ÊÇÓÃÀ´´æ´¢ÉÙÁ¿µÄ´úÂë,ÕâʱNORÉÁ´æ¸üÊʺÏһЩ¡£¶øNANDÔòÊǸßÊý¾Ý´æ´¢ÃܶȵÄÀíÏë½â¾ö·½°¸¡£
¡¡¡¡NORµÄÌصãÊÇоƬÄÚÖ´ÐÐ(XIP, eXecute In Place),ÕâÑùÓ¦ÓóÌÐò¿ÉÒÔÖ±½ÓÔÚflashÉÁ´æÄÚÔËÐÐ,²»±ØÔÙ°Ñ´úÂë¶Áµ½ÏµÍ³RAMÖС£
NORµÄ´«ÊäЧÂʺܸß,ÔÚ1¡«4MBµÄСÈÝÁ¿Ê±¾ßÓкܸߵijɱ¾Ð§Òæ,µ«ÊǺܵ͵ÄдÈëºÍ²Á³ýËٶȴó´óÓ°ÏìÁËËüµÄÐÔÄÜ¡£
¡¡¡¡NAND½á¹¹ÄÜÌṩ¼«¸ßµÄµ¥ÔªÃܶÈ,¿ÉÒÔ´ïµ½¸ß´æ´¢ÃܶÈ,²¢ÇÒдÈëºÍ²Á³ýµÄËÙ¶ÈÒ²ºÜ¿ì¡£Ó¦ÓÃNANDµÄÀ§ÄÑÔÚÓÚflashµÄ¹ÜÀíºÍÐèÒªÌØÊâµÄϵͳ½Ó¿Ú¡£
ÐÔÄܱȽÏ
¡¡¡¡flashÉÁ´æÊÇ·ÇÒ×ʧ´æ´¢Æ÷,¿ÉÒÔ¶Ô³ÆΪ¿éµÄ´æ´¢Æ÷µ¥Ôª¿é½øÐвÁдºÍÔÙ±à³Ì¡£ÈκÎflashÆ÷¼þµÄдÈë²Ù×÷Ö»ÄÜÔÚ¿Õ»òÒѲÁ³ýµÄµ¥ÔªÄÚ½øÐÐ,ËùÒÔ´ó¶àÊýÇé¿öÏÂ,ÔÚ½øÐÐдÈë²Ù×÷֮ǰ±ØÐëÏÈÖ´ÐвÁ³ý¡£NANDÆ÷¼þÖ´ÐвÁ³ý²Ù×÷ÊÇÊ®·Ö¼òµ¥µÄ,¶øNORÔòÒªÇóÔÚ½øÐвÁ³ýÇ°ÏÈÒª½«Ä¿±ê¿éÄÚËùÓеÄλ¶¼Ð´Îª0¡£
¡¡¡¡ÓÉÓÚ²Á³ýNORÆ÷¼þʱÊÇÒÔ64¡«128KBµÄ¿é½øÐеÄ,Ö´ÐÐÒ»¸öдÈë/²Á³ý²Ù×÷µÄʱ¼äΪ5s,Óë´ËÏà·´,²Á³ýNANDÆ÷¼þÊÇÒÔ8¡«32KBµÄ¿é½øÐеÄ,Ö´ÐÐÏàͬµÄ²Ù×÷×î¶àÖ»ÐèÒª4ms¡£
¡¡¡¡Ö´ÐвÁ³ýʱ¿é³ß´çµÄ²»Í¬½øÒ»²½À´óÁËNORºÍNADNÖ®¼äµÄÐÔÄܲî¾à,ͳ¼Æ±íÃ÷,¶ÔÓÚ¸ø¶¨µÄÒ»Ì×дÈë²Ù×÷(ÓÈÆäÊǸüÐÂСÎļþʱ¸ü¶àµÄ²Á³ý²Ù×÷±ØÐëÔÚ»ùÓÚNORµÄµ¥ÔªÖнøÐС£ÕâÑù,µ±Ñ¡Ôñ´æ´¢½â¾ö·½°¸Ê±,Éè¼Æʦ±ØÐëȨºâÒÔϵĸ÷ÏîÒòËØ¡£
¡¡¡¡¡ñ NORµÄ¶ÁËٶȱÈNANDÉÔ¿ìһЩ¡£
¡¡¡¡¡ñ NANDµÄдÈëËٶȱÈNOR¿ìºÜ¶à¡£
¡¡¡¡¡ñ NANDµÄ4ms²Á³ýËÙ¶ÈÔ¶±ÈNORµÄ5s¿ì¡£
¡¡¡¡¡ñ ´ó¶àÊýдÈë²Ù×÷ÐèÒªÏȽøÐвÁ³ý²Ù×÷¡£
¡¡¡¡¡ñ NANDµÄ²Á³ýµ¥Ôª¸üС,ÏàÓ¦µÄ²Á³ýµç·¸üÉÙ¡£
½Ó¿Ú²î±ð
¡¡¡¡NOR flash´øÓÐSRAM½Ó¿Ú,ÓÐ×ã¹»µÄµØÖ·Òý½ÅÀ´Ñ°Ö·,¿ÉÒÔºÜÈÝÒ׵شæÈ¡ÆäÄÚ²¿µÄÿһ¸ö×Ö½Ú¡£
¡¡¡¡NANDÆ÷¼þʹÓø´ÔÓµÄI/O¿ÚÀ´´®ÐеشæÈ¡Êý¾Ý,¸÷¸ö²úÆ·»ò³§É̵ķ½·¨¿ÉÄܸ÷²»Ïàͬ¡£8¸öÒý½ÅÓÃÀ´´«ËÍ¿ØÖÆ¡¢µØÖ·ºÍÊý¾ÝÐÅÏ¢¡£
¡¡¡¡NAND¶ÁºÍд²Ù×÷²ÉÓÃ512×ֽڵĿé,ÕâÒ»µãÓеãÏ
Ïà¹ØÎĵµ£º
Main.cpp (Win/*nix)
#include "FlexSecurityBox.h"
int main(int argc, char ** argv) {
char * address;
short port;
if (argc == 2)
{
address = "0.0.0.0";
port = atoi(argv[1]);
} else if (argc == 3)
{
address = argv[1];
port = atoi(argv[2]);
} else
{
printf("Y ......
¶ÔÊýѧÕâÒ»²¿·Ö£¬ÎÒÔ½À´Ô½Ï²»¶¹ØÓÚflash ºÍÊýѧµÄ½áºÏ¡£¸ßÖеÄÊýѧ£¬´óѧµÄÊýѧ¶¼ºÜÏëºÜÏë½Ó´¥£¬µ«ÊÇÓÉÓڸߵÈÊýѧ²¢Ã»Ñ§µÃºÜºÃ£¬ËùÒÔÕⲿ·ÖµÄ֪ʶȱÉÙÁË¡£½ñÌìÎÞÒâÖ®ÖУ¬¿´µ½ÇòÌåµÄ²ÎÊýµÄ·½³ÌµÄʱºò£¬ÈÃÎÒ ÐËȤ´óÔöÁË¡£×Ðϸ¹Û¿´ÄǸö²ÎÊý·½³Ì£¬Ô½·¢¾õËûµÄ÷ÈÁ¦¡£
ÇòÃæµÄ¹«Ê½£ºx*x+y*y+z*z=a*a£»
ËûµÄ²ÎÊý·½³ÌÊ ......
HTML clipboardThese days a
16GB USB thumb drive
is as necessary as your house keys. Whether you are
taking large work files back and forth from the office or are sharing pictures,
videos, and music with friends, nothing beats the convenience of a USB storage
drive. Well, why not make sure t ......
/etc/fonts/conf.d/
±à¼µÄÎļþΪ
sudo gedit ./49-sansserif.conf
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!--
If the font still has no generic name, add sans-serif
-->
<match target="p ......
ÔÚƽÃæµÄʱºò£¬Ô²¿ÉÒÔÈÏΪÊÇÍÖÔ²Ò»¸öÌØÀý£¬¶øÇòÃæÒ²¿ÉÒÔÈÏΪÇòÍÖÇòÃæÒ»¸öÌØÀý£¬µ«ÊÇÁ½ÕßÒÀ¾É»á´æÔÚһЩ²î±ð¡£ÕâһЩ²î±ð»á²úÉú²»Í¬µÄÐÎ×´£¬²éÔÄÁËһЩ¹ØÓÚÍÖÇòÃæµÄ×ÊÁϺÜƤëÁ˽âһЩ¡£
ÍÖÇòÌåµÄ·½³Ì±íʾ£º x2 /a2+y2/b2+z2/c2=1;
²ÎÊý·½³Ì£º
£¨¸ÃͼƬÀ´Ô´ÓÚÍøÂ磩
ͨ³££¨a≥b≥c>0£© ( ......