{"rsdb":{"rid":"180382","subhead":"","postdate":"0","aid":"130807","fid":"92","uid":"1","topic":"1","content":"
\n

    \u4ece\u5f00\u59cb\u5e94\u7528SDRAM\u5230\u5de5\u7a0b\u4e2d\u5df2\u7ecf\u6709\u4e24\u4e2a\u6708\u4e86\uff0c\u8fd9\u4e24\u4e2a\u6708\u4e00\u76f4\u5728\u4eff\u771f\u8c03\u8bd5SDRAM\u5728\u538b\u7f29\u5de5\u7a0b\u4e2d\u7684\u8bfb\u5199\u64cd\u4f5c\u3002<\/p> \n

\u3000 LPAQ\u538b\u7f29\u7b97\u6cd5\u7684\u786c\u4ef6\u5316\u5b9e\u73b0\u5f88\u91cd\u8981\u4e00\u70b9\u5728\u4e8e\u538b\u7f29\u8fc7\u7a0b\u4e2d\u4ea7\u751f\u7684\u5927\u91cfHASH\u9884\u6d4b\u503c\uff0c\u5982\u4f55\u5b58\u50a8\u8fd9\u4e9bHASH\u503c\uff0c\u4ee5\u53ca\u5feb\u901f\u7684\u5bf9\u8fd9\u4e9b\u6570\u636e\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\uff0c\u662f\u6574\u4e2a\u538b\u7f29\u9879\u76ee\u786c\u4ef6\u5316\u7684\u6027\u80fd\u5173\u952e\u70b9\u3002<\/p> \n

\u3000 \u597d\u4e86\uff0c\u8bdd\u4e0d\u591a\u8bf4\uff0c\u5148\u4ecb\u7ecd\u5b98\u65b9\u6587\u6863\u4e0a\u5173\u4e8eSDRAM\u7684\u8bfb\u5199\u64cd\u4f5c\uff1a<\/p> \n

    1.SDRAM\u521d\u59cb\u5316\u9664\u4e86\u5f00\u59cb\u7684\u9884\u5145\u7535\u64cd\u4f5c\uff0c\u6700\u91cd\u8981\u7684\u5c31\u662f\u6a21\u5f0f\u5bc4\u5b58\u5668\u7684\u8bbe\u7f6e\u3002\u8fd9\u4e2a\u5e94\u8be5\u5927\u90e8\u5206\u53ef\u4ee5\u5728SDRAM\u63a7\u5236\u5668\u4e2d\u8fdb\u884c\u4fee\u6539\uff1a<\/p> \n

\"\"<\/p> \n

   \u6a21\u5f0f\u5bc4\u5b58\u5668\u4e3b\u8981\u662f\u7528\u6765\u8bbe\u7f6e\u7a81\u53d1\u957f\u5ea6\uff0c\u8fd8\u6709\u64cd\u4f5c\u6a21\u5f0f\uff1a\u662f\u5426\u8fdb\u884c\u7a81\u53d1\u8bfb\u5199\u64cd\u4f5c\u3002\u8fd9\u4e2a\u5f53\u7136\u662f\u6839\u636e\u5de5\u7a0b\u7684\u5b9e\u9645\u9700\u8981\u8fdb\u884c\u8bbe\u7f6e\uff0c\u4e00\u822c\u90fd\u9ed8\u8ba4\u7a81\u53d1\u8bfb\u5199\u3002<\/p> \n

   2.\u8bfb\u5199\u64cd\u4f5c<\/p> \n

   \u9996\u5148\u8981<\/p> \n

   \u5199\u64cd\u4f5c\uff0c\u4e3b\u8981\u5206\u4e3a\u4e00\u4e2aBANK\u8fde\u7eed\u5199\u548c\u591a\u4e2aBANK\u4ea4\u66ff\u5199\u4e24\u79cd\u60c5\u51b5\u3002<\/p> \n

   \u7a81\u53d1\u5199\uff0c\u4e00\u6b21\u4e2a\u5730\u5740\u8fde\u7eed\u5199\u5165BL\u4e2a\u6570\u636e\uff1a<\/p> \n

\"\"<\/p> \n

   \u8fde\u7eed\u5199\uff0c\u4e0d\u540c\u7684\u5730\u5740\u8fde\u7eed\u5199\u6570\u636e\uff1a<\/p> \n

\"\"<\/p> \n

   \u4e0a\u9762\u90fd\u662f\u8fde\u7eed\u5199\u7684\u60c5\u51b5\uff0c\u5f53\u7136\u5982\u679c\u53ea\u662f\u4e00\u4e2a\u5730\u5740\u5199\u5165\u6570\u636e\uff0c\u7136\u540e\u5730\u5740\u52a0\u4e00\uff0c\u5728\u5199\u5165\u6570\u636e\uff0c\u8fd9\u79cd\u8fde\u7eed\u7684\u5199\u64cd\u4f5c\u4e0d\u5982\u4f7f\u7528DDR\u4f1a\u5f97\u5230\u66f4\u5feb\u7684\u901f\u5ea6\u3002<\/p> \n

    \u5982\u679c\u662fBANK\u5730\u5740\u4ea4\u66ff\u7684\u5199\u64cd\u4f5c\uff0c\u63a7\u5236\u65f6\u5e8f\u5e94\u8be5\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p> \n

\"\"<\/p> \n

   \u6309\u7167\u4e0a\u56fe\u4e2d\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u8fd8\u5e94\u8be5\u5728SDRAM\u63a7\u5236\u5668\u4e2d\u8bbe\u7f6e\u8bfb\u5199\u64cd\u4f5c\u65f6 Addr[10] = 1\uff0c\u6253\u5f00\u81ea\u52a8\u9884\u5145\u7535\u64cd\u4f5c\u3002\u4e0d\u7136\u7b49\u5230\u5b9e\u9645\u64cd\u4f5c\u65f6\u4f1a\u53d1\u73b0\u53ef\u80fd\u4e0a\u4e00\u4e2aBANK a, COL b\u4e2d\u5199\u5165\u7684<\/p> \n

\u6570\u636e\uff0c\u5728BANK a, COL c\u4e2d\u8bfb\u51fa\u6765\uff0c\u539f\u56e0\u5c31\u5728\u4e8e\u6ca1\u6709\u542f\u52a8\u81ea\u52a8\u9884\u5145\u7535\uff0c\u6bcf\u6b21\u5199\u5165\u6570\u636e\u65f6\uff0cBANK\u6fc0\u6d3b\u540e\u6ca1\u6709\u8fdb\u884c\u5173\u95ed\u64cd\u4f5c\uff0c\u5728\u4e0b\u4e00\u6b21\u5bf9\u8be5BANK\u8fdb\u884c\u8bfb\u64cd\u4f5c\u65f6\uff0c\u5c31\u4f1a\u76f4\u63a5\u628a\u6253\u5f00\u7684BANK<\/p> \n

\u4e2d\u5bc4\u5b58\u5728S-AMP\u4e2d\u7684\u6570\u636e\u8bfb\u53d6\u51fa\u6765\uff0c\u9020\u6210\u9519\u8bef\u7684\u8bfb\u64cd\u4f5c\u3002\uff08\u4e3a\u4e86\u8c03\u8bd5\u8fd9\u4e2a\u95ee\u9898\uff0c\u535a\u4e3b\u53ef\u662f\u82b1\u4e86\u534a\u4e2a\u6708\u65f6\u95f4...)\u3002<\/p> \n

    \u5199\u5165\u6570\u636e\u540e\u8fdb\u884c\u9884\u5145\u7535\u7684\u65f6\u5e8f\u56fe\u5e94\u8be5\u5982\u4e0b\uff1a<\/p> \n

\"\"<\/p> \n

      \u4e0a\u56fe\u4e2d\uff0ctRP\u662f\u9884\u5145\u7535\u64cd\u4f5c\u5230\u4e0b\u4e00\u6b21ACTIVE\u64cd\u4f5c\u6240\u9700\u8981\u7684\u65f6\u95f4\uff0c\u5177\u4f53\u65f6\u95f4\u9700\u8981\u67e5\u770b\u6240\u7528SDRAM\u7684\u624b\u518c\u4e0a\u3002\u5728\u64cd\u4f5c\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u9009\u62e9\u81ea\u52a8\u9884\u5145\u7535\u6a21\u5f0f\uff0c\u5728\u8bfb\u64cd\u4f5c\u6216\u8005\u5199\u64cd\u4f5c\u5b8c\u6210\u540e\uff0c\u5fc5\u987b\u7559\u591f\u5927\u4e8e\u7b49\u4e8etRP\u7684\u65f6\u95f4\uff0c\u6765\u4fdd\u8bc1\u8bfb\u5199\u64cd\u4f5c\u5b8c\u540e\uff0c\u8be5BANK\u6210\u529f\u5173\u95ed\uff0c\u4e0d\u7136\u8fd8\u662f\u4f1a\u51fa\u73b0\u8bfb\u6570\u636e\u9519\u8bef\u7684\u60c5\u51b5\u3002<\/p> \n

      \u9664\u4e86\u4e0a\u9762\u5173\u4e8e\u8bfb\u5199\u64cd\u4f5c\u7684\u65f6\u5e8f\u9700\u8981\u9075\u5b88\uff0c\u5728\u5b9e\u9645\u64cd\u4f5c\u4e2d\uff0c\u7531\u4e8e\u5404\u4e2aSDRAM\u63a7\u5236\u5668\u4e0d\u540c\uff0c\u9700\u8981\u6ce8\u610f\u63a7\u5236\u5668\u4e5f\u8bb8\u4f1a\u4ea7\u751f\u64cd\u4f5c\u547d\u4ee4\u7684\u5ef6\u65f6\u3002\u5c31\u4ee5\u535a\u4e3b\u4f7f\u7528\u7684\u63a7\u5236\u5668\u4e3e\u4f8b\u6765\u8bf4\uff0c\u6bcf\u6b21\u60f3\u63a7\u5236\u5668\u53d1\u9001\u547d\u4ee4\u540e\uff0c\u9700\u8981\u7ecf\u8fc71clk\u540e\uff0c\u63a7\u5236\u5668\u624d\u628a\u6307\u4ee4\u4f20\u7ed9SDRAM\u3002\u5173\u4e8e\u8fd9\u4e00\u70b9\u6700\u91cd\u8981\u7684\u4f53\u73b0\u5c31\u662f\u5728\u5199\u5165\u6570\u636e\u65f6\uff0c\u6570\u636e\u4e0d\u662f\u5728\u53d1\u51fawrite\u547d\u4ee4\u65f6\u5199\u5165\uff0c\u800c\u662f\u5728\u53d1\u51fawrite\u547d\u4ee4\u540e\u4e00\u4e2aCLK\u5199\u5165\uff0c\u5fc5\u987b\u4ed4\u7ec6\u6ce8\u610f\u8fd9\u4e00\u70b9\uff0c\u4e0d\u7136\u5c31\u4f1a\u51fa\u9519\u54e6\u3002\u4e0b\u9762\u8d34\u4e00\u5f20\u6211\u5355\u72ec\u4eff\u771fSDRAM\u63a7\u5236\u5668\u7684\u65f6\u5e8f\u56fe\u5427\uff1a<\/p> \n

\"\"<\/p> \n

     \u4e0a\u56fe\u662f\u6211\u5728\u4eff\u771f\u65f6\u6d4b\u8bd5\u51fa\u6765\u7684\u6b63\u786e\u5199\u64cd\u4f5c\u65f6\u5e8f\uff1a\u5728\u53d1\u9001ACTIVE(sdram_command = 7)\u65f6\uff0c\u5fc5\u987b\u4fdd\u8bc1\u5730\u5740\u5df2\u51fa\u73b0\u4e00\u4e2aCLK\u3002\u7ed9\u51faACTIVE\u4fe1\u53f7\u540e\uff0c\u5fc5\u987b\u7b49\u5f851\u4e2aCLK( tRCD = 20ns)\uff0c\u7136\u540e\u624d\u80fd\u53d1\u51fa\u5199\u4fe1\u53f7\u3002\u5728\u5199\u4fe1\u53f7\u7ed9\u51fa\u540e1clk\u540e\u7ed9\u51fa\u9700\u8981\u5199\u5165\u7684\u6570\u636e\u3002\u4e0a\u56fe\u7684\u65f6\u5e8f\u662f\u5bf9\u5730\u574025'h13bfc60\u7684\u5199\u64cd\u4f5c\uff0cSDRAM0\u5199\u5165\u7684\u6570\u636e\u662f16\u2019h0300\uff0c\u800c\u4e0d\u662f16\u2018h0030\u3002\u8fd9\u4e00\u70b9\u5728\u5b9e\u9645\u5de5\u7a0b\u4e2d\u9700\u8981\u975e\u5e38\u6ce8\u610f\u3002<\/p> \n

      \u7136\u540e\u662f\u63a5\u4e0b\u6765\u7684\u8bfb\u6570\u636e\u6d4b\u8bd5\u3002\u4e4b\u524d\u63d0\u8fc7\uff0c\u5982\u679c\u9700\u8981BANK\u4ea4\u66ff\u7684\u8bfb\u5199\u64cd\u4f5c\uff0c\u5fc5\u987b\u5728\u63a7\u5236\u5668\u4e2d\u8bbe\u7f6e\u81ea\u52a8\u9884\u5145\u7535\uff0c\u5728\u4e0a\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa\u5728\u5199\u547d\u4ee4\uff0csdram_command = 1\u65f6\uff0c\u5730\u5740\u7684\u7b2c\u5341\u4f4dAddr[10] = 1\uff0c\u8fd9\u6837\u8868\u793a\u5199\u5b8c\u6570\u636e\u540e\u4f1a\u8fdb\u884c\u81ea\u52a8\u9884\u5145\u7535\u64cd\u4f5c\u3002\u8bfb\u6570\u636e\u4e5f\u662f\u4e00\u6837\u7684\uff1a<\/p> \n

\"\"<\/p> \n

      \u5728\u8fdb\u884c\u8bfb\u64cd\u4f5c\u65f6\uff0c\u4e5f\u662f\u5148\u7ed9ACTIVE\u547d\u4ee4\uff0c\u7136\u540e\u7b49\u5f85tRCD\uff0c\u7136\u540e\u7ed9\u51fa\u8bfb\u547d\u4ee4\uff0c\u7136\u540e\u7ecf\u8fc7tCL\u65f6\u95f4\u540e\uff0c\u6570\u636e\u5c31\u4f1a\u51fa\u73b0\u5728\u6570\u636e\u603b\u7ebf\u4e0a\u3002\u9700\u8981\u6ce8\u610f\u7684\u5730\u65b9\u662f\uff1a\u5728\u53d1\u51fa\u8bfb\u547d\u4ee4\u540e\uff0c\u6570\u636e\u5176\u5b9e\u5c31\u51fa\u73b0\u5728S-AMP\u4e0a\uff0c\u53ea\u662f\u9700\u8981\u7b49\u5f85tCL\u540e\u6570\u636e\u4fe1\u53f7\u624d\u4f1a\u7ecf\u8fc7\u653e\u5927\u51fa\u73b0\u5728\u603b\u7ebf\u4e0a\u3002\u6240\u4ee5\u9884\u5145\u7535\u64cd\u4f5c\u65f6\u5728\u8bfb\u547d\u4ee4\u7ed3\u675f\u540e\u7acb\u523b\u5f00\u59cb\u7684\uff0c\u5728\u8bfb\u5b8c\u540e\u7559\u51fatRP(20ns)\u65f6\u95f4\u8fdb\u884c\u9884\u5145\u7535\u64cd\u4f5c\u3002\u800c\u8bfb\u8005\u4f1a\u53d1\u73b0\u5728\u4e0a\u56fe\u4e2d\u6211\u7559\u51fa\u4e8630ns\u8fdb\u884c\u9884\u5145\u7535\uff0c\u8fd9\u662f\u56e0\u4e3a\u63a7\u5236\u5668\u4ea7\u751f\u4e8610ns\u7684\u5ef6\u65f6\uff0c\u5bfc\u81f4\u9884\u5145\u7535\u5b9e\u9645\u4e0a\u662f\u5728\u8bfb\u547d\u4ee4\u7ed3\u675f\u540e10ns\u624d\u5f00\u59cb\u7684\u3002<\/p> \n

      \u8fd9\u7bc7\u535a\u5ba2\u5199\u5230\u8fd9\u91cc\u5dee\u4e0d\u591a\u5c31\u8be5\u7ed3\u675f\u4e86\uff0c\u638c\u63e1\u4e86SDRAM\u8bfb\u5199\u81ea\u52a8\u9884\u5145\u7535\u7684\u64cd\u4f5c\uff0c\u5bf9SDRAM\u7684\u8bfb\u5199\u64cd\u4f5c\u57fa\u672c\u5c31\u4e0d\u5b58\u5728\u95ee\u9898\u3002\u5f53\u7136\u5728\u5b9e\u9645\u5de5\u7a0b\u4e2d\uff0cSDRAM\u7684\u8bfb\u5199\u901f\u5ea6\u771f\u7684\u7b97\u662f\u5f88\u6162\u7684\uff0c\u56e0\u4e3a\u5b58\u5728\u6bcf\u6b21\u8bfb\u5199\u540e\u7684\u9884\u5145\u7535\u64cd\u4f5c\uff0c\u800cDDR\u5728\u64cd\u4f5c\u65f6\uff0c\u7531\u4e8eBANK\u6570\u636e\u8fbe\u52308\u4e2a\uff0cBANK\u4e4b\u95f4\u4ea4\u66ff\u8fdb\u884c\u64cd\u4f5c\u53ef\u4ee5\u63a9\u76d6\u5355\u4e2aBANK\u7684\u9884\u5145\u7535\u65f6\u95f4\u3002DRAM\u5b58\u50a8\u5668\u5728\u64cd\u4f5c\u4e2d\u90fd\u5b58\u5728\u9884\u5145\u7535\u64cd\u4f5c\uff0c\u800cSRAM\u662f\u4e0d\u5b58\u5728\u9884\u5145\u7535\u64cd\u4f5c\u7684\uff0c\u535a\u4e3b\u7684\u4e0b\u4e00\u6b65\u662f\u7814\u7a76cypress\u7684QDR II + SRAM\u5b58\u50a8\u5668\uff0c\u770b\u770b\u80fd\u5426\u83b7\u5f97\u66f4\u9ad8\u7684\u8bfb\u5199\u901f\u5ea6\u3002<\/p>\n<\/div>","orderid":"0","title":"\u5173\u4e8eSDRAM\u5b58\u50a8\u5668\u5728\u5de5\u7a0b\u4e2d\u7684\u5e94\u7528\u8be6\u89e3","smalltitle":"","mid":"0","fname":"Verilog","special_id":"0","bak_id":"0","info":"0","hits":"2380","pages":"1","comments":"0","posttime":"2017-10-10 12:30:31","list":"1507609831","username":"admin","author":"","copyfrom":"","copyfromurl":"","titlecolor":"","fonttype":"0","titleicon":"0","picurl":"https:\/\/www.cppentry.com\/upload_files\/article\/92\/1_j71p3__.png","ispic":"1","yz":"1","yzer":"","yztime":"0","levels":"0","levelstime":"0","keywords":"\u5173\u4e8e<\/A> SDRAM<\/A> \u5b58\u50a8\u5668<\/A> \u5de5\u7a0b<\/A> \u5e94\u7528<\/A> \u8be6\u89e3<\/A>","jumpurl":"","iframeurl":"","style":"","template":"a:3:{s:4:\"head\";s:0:\"\";s:4:\"foot\";s:0:\"\";s:8:\"bencandy\";s:0:\"\";}","target":"0","ip":"113.108.110.181","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"\u5173\u4e8eSDRAM\u5b58\u50a8\u5668\u5728\u5de5\u7a0b\u4e2d\u7684\u5e94\u7528\u8be6\u89e3","lastview":"1713542377","digg_num":"858","digg_time":"0","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}