{"id":100666,"date":"2026-09-05T03:16:53","date_gmt":"2026-09-04T19:16:53","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/100666.html"},"modified":"2026-09-05T03:16:53","modified_gmt":"2026-09-04T19:16:53","slug":"hls%e9%ab%98%e5%b1%82%e6%ac%a1%e7%bb%bc%e5%90%88%e8%ae%be%e8%ae%a1-axi%e4%b9%8bburst%e7%ba%a0%e5%81%8f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/100666.html","title":{"rendered":"HLS\u9ad8\u5c42\u6b21\u7efc\u5408\u8bbe\u8ba1--axi\u4e4bburst\u7ea0\u504f"},"content":{"rendered":"<p>\u4e00\u3001\u95ee\u9898\u6765\u6e90&#xff1a;https:\/\/zhuanlan.zhihu.com\/p\/478941270<\/p>\n<p>\u4e8c\u3001\u5177\u4f53\u4ee3\u7801<br \/>\nvoid ReadFeature(ap_uint&lt;64&gt; *feat_map, const TABLE_T *table, const uint32_t table_size,<br \/>\n\u00a0 \u00a0 hls::stream&lt;ap_uint&lt;48&gt;&gt; &amp;feat_word_strm)<br \/>\n{<br \/>\n\u00a0 \u00a0 TABLE_T voxel_pt_num;<br \/>\n\u00a0 \u00a0 TABLE_T pt_id &#061; 0;<\/p>\n<p>\u00a0 \u00a0 for (uint32_t i &#061; 0; i &lt; table_size; ) {<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 #pragma HLS PIPELINE II&#061;1<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 #pragma HLS LOOP_TRIPCOUNT min&#061;204800 max&#061;300000 avg&#061;250000<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 voxel_pt_num &#061; table[i];<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \/\/ empty voxel<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 if (voxel_pt_num &#061;&#061; 0) {<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 i&#043;&#043;;<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 pt_id &#061; 0;<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 }<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/ non-empty voxel<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 else {<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 uint32_t offset &#061; i * 32 &#043; pt_id;<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ap_uint&lt;64&gt; feat_word &#061; feat_map[offset];<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 feat_word_strm.write(feat_word.range(47, 0).get());<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (pt_id &#061;&#061; (voxel_pt_num &#8211; 1)) {<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 pt_id &#061; 0;<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 i&#043;&#043;;<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 else {<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 pt_id&#043;&#043;;<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<br \/>\n\u00a0 \u00a0 \u00a0 \u00a0 }<br \/>\n\u00a0 \u00a0 }<br \/>\n}<\/p>\n<p>\u4e09\u3001\u95ee\u9898\u8bf4\u660e<br \/>\n1.\u8fd9\u6bb5\u4ee3\u7801\u6587\u7ae0\u535a\u4e3b\u8bf4\u4e0d\u80fdburst\u8bbf\u95ee&#xff1b;<br \/>\n2.\u4f7f\u7528\u4e86outstanding\u4f18\u5316&#xff0c;outstanding\u4ece4\u6539\u4e3a16&#xff0c;\u95ee\u9898\u6ca1\u6709\u89e3\u51b3<br \/>\n3.\u4f7f\u7528\u4e86latency\u8bbe\u7f6e&#xff0c;\u5c06AXI\u7684latency\u8bbe\u7f6e\u4e3a40,\u89e3\u51b3\u4e86\u95ee\u9898&#xff1b;<\/p>\n<p>\u56db\u3001\u535a\u4e3b\u5f97\u5230\u7684\u7ed3\u8bba\u662f<br \/>\n1.\u4f7f\u7528\u6307\u9488\u5b9e\u73b0AXI\u603b\u7ebf\u7684\u9876\u5c42\u63a5\u53e3&#xff08;\u5c24\u5176\u662f\u8bbf\u95eeDDR\u65f6&#xff09;\u52a1\u5fc5\u6839\u636e\u5b9e\u9645\u9700\u8981\u8bbe\u7f6elatency&#xff0c;\u5f71\u54cd\u5de8\u5927\u3002<br \/>\n2.burst\u8bbf\u95ee\u53ef\u4ee5\u901a\u8fc7\u5728for\u5faa\u73af\u4e2d\u987a\u6b21\u8bbf\u95ee\u6765\u5b9e\u73b0&#xff0c;\u4f46\u662f\u6ce8\u610f\u5730\u5740\u5fc5\u987b\u8fde\u7eed\u4e14\u4e0d\u80fd\u5728if\u5206\u652f\u4e2d\u8bbf\u95ee\u3002<br \/>\n3.\u5fc5\u8981\u7684\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528memcpy\u6765\u663e\u5f0f\u5730\u6307\u5b9aburst\u3002<br \/>\n4.\u5e0c\u671b\u672a\u6765\u80fd\u6709\u67d0\u79cd\u63a5\u53e3\u53ef\u4ee5\u72ec\u7acb\u5730\u63a7\u5236AXI\u7684AR\/AW\u901a\u9053\u4e0eR\/W\u901a\u9053&#xff0c;\u8fd9\u6837\u4e0d\u5fc5\u6839\u636e\u5916\u90e8\u60c5\u51b5\u6307\u5b9alatency&#xff0c;\u4e5f\u4e0d\u5fc5\u6d6a\u8d39\u76f8\u5e94\u7684\u8d44\u6e90&#xff0c;\u8bbe\u8ba1\u7684IP\u7684\u9002\u914d\u6027\u4e5f\u66f4\u5e7f\u3002<\/p>\n<p>\u4e94\u3001\u8bf4\u660e<br \/>\n1.\u867d\u7136\u535a\u4e3b\u8bbe\u7f6eaxi latency&#061;40\u89e3\u51b3\u4e86\u95ee\u9898&#xff0c;\u4f46\u662f\u8fd8\u662f\u6ca1\u6709\u672c\u8d28\u89e3\u51b3&#xff1b;<br \/>\n2.\u4e0a\u8ff0\u4ee3\u7801\u5c31\u4e0d\u80fd\u8fd9\u4e48\u8bbe\u8ba1&#xff0c;burst\u8bbf\u95ee\u4e0d\u80fd\u6709\u6761\u4ef6&#xff0c;\u8fd9\u4e2a\u662f\u57fa\u672c\u8981\u6c42&#xff0c;\u4e5f\u5c31\u662f\u8bbe\u8ba1\u8fdd\u89c4\u4e86&#xff1b;<\/p>\n<p>\u516d\u3001burst\u6848\u4f8b\u4e00\u7ea0\u6b63<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/ ORIGINAL \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\n#include &lt;ap_int.h&gt;<br \/>\nvoid foo(ap_int&lt;21&gt; *a, ap_int&lt;21&gt; *b) {<br \/>\n\u00a0 for (long i &#061; 0; i &lt; 256; &#043;&#043;i)<br \/>\n\u00a0 \u00a0 b[i] &#061; a[i];<br \/>\n}<\/p>\n<p>\/\/\/\/\/\/\/\/\/\/\/\/ UPDATED \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\n\/\/ Use &#039;int&#039; instead of &#039;ap_int&lt;24&gt;&#039;<br \/>\nvoid foo(int *a, int *b) {<br \/>\n\u00a0 for (long i &#061; 0; i &lt; 256; &#043;&#043;i)<br \/>\n\u00a0 \u00a0 b[i] &#061; a[i];<br \/>\n}<br \/>\n\u6ce8\u610faxi\u603b\u7ebf\u8bbf\u95ee&#xff0c;\u4e0d\u80fd\u662f\u975e32bit\u6216\u8005\u975e64bit\u7684<\/p>\n<p>\u4e03\u3001burst\u6848\u4f8b\u4e8c\u7ea0\u6b63<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/ ORIGINAL \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\nvoid foo(volatile int *a, volatile int *b) {<br \/>\n\u00a0 for (long i &#061; 0; i &lt; 256; &#043;&#043;i)<br \/>\n\u00a0 \u00a0 b[i] &#061; a[i];<br \/>\n}<br \/>\n\u00a0<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/ UPDATED \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\nvoid foo(int *a, int *b) {<br \/>\n\u00a0 for (long i &#061; 0; i &lt; 256; &#043;&#043;i)<br \/>\n\u00a0 \u00a0 b[i] &#061; a[i];<br \/>\n}<br \/>\nvolatile\u5bf9\u603b\u7ebf\u8fdb\u884c\u4e86\u5f71\u54cd&#xff01;&#xff01;<\/p>\n<p>\u516b\u3001burst\u6848\u4f8b\u4e09\u7ea0\u6b63<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/ ORIGINAL \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\nstruct mystruct {<br \/>\n\u00a0 char a;<br \/>\n\u00a0 short b;<br \/>\n};<br \/>\n\u00a0<br \/>\nvoid foo(mystruct *a, mystruct *b) {<br \/>\n\u00a0 for( int i &#061; 0; i &lt; 256; &#043;&#043;i )<br \/>\n\u00a0 \u00a0 b[i] &#061; a[i];<br \/>\n}<br \/>\n\u00a0<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/ UPDATED \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\nstruct mystruct {<br \/>\n\u00a0 char a;<br \/>\n\u00a0 short b;<br \/>\n} __attribute__((packed, aligned(4)));<br \/>\n\u00a0<br \/>\nvoid foo(mystruct *a, mystruct *b) {<br \/>\n\u00a0 for( int i &#061; 0; i &lt; 256; &#043;&#043;i )<br \/>\n\u00a0 \u00a0 b[i] &#061; a[i];<br \/>\n}<\/p>\n<p>\n\u4e5d\u3001burst\u6848\u4f8b\u56db\u7ea0\u6b63<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/ ORIGINAL \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\nvoid foo(int *a, int *b) {<br \/>\n\u00a0 for (long i &#061; 0; i &lt; 256; &#043;&#043;i)<br \/>\n\u00a0 \u00a0 b[i*4] &#061; a[i*4] ;<br \/>\n}<br \/>\n\u00a0<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/ UPDATED \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\n\/\/ Use continuous accesses<br \/>\nvoid foo(int *a, int *b) {<br \/>\n\u00a0 for (long i &#061; 0; i &lt; 256; &#043;&#043;i)<br \/>\n\u00a0 \u00a0 b[i] &#061; a[i] ;<br \/>\n}<\/p>\n<p>\u5341\u3001burst\u6848\u4f8b\u4e94\u7ea0\u6b63<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/ ORIGINAL \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\nvoid foo(int *a) {<br \/>\n\u00a0 int buff[256];<br \/>\n\u00a0 for (long i &#061; 0; i &lt; 256; &#043;&#043;i) {<br \/>\n\u00a0 \u00a0 if (i &lt;&#061; 6)<br \/>\n\u00a0 \u00a0 \u00a0 buff[i] &#061; a[i];<br \/>\n\u00a0 \u00a0 &#8230;<br \/>\n\u00a0 }<br \/>\n\u00a0 &#8230;<br \/>\n}<br \/>\n\u00a0<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/ UPDATED \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\n\/\/ Remove conditional accesses<br \/>\nvoid foo(int *a) {<br \/>\n\u00a0 int buff[256];<br \/>\n\u00a0 for (long i &#061; 0; i &lt; 7; &#043;&#043;i)<br \/>\n\u00a0 \u00a0 buff[i] &#061; a[i];<br \/>\n\u00a0<br \/>\n\u00a0 for (long i &#061; 0; i &lt; 256; &#043;&#043;i) {<br \/>\n\u00a0 \u00a0 &#8230;<br \/>\n\u00a0 }<br \/>\n\u00a0 &#8230;<br \/>\n}<\/p>\n<p>\n\u5341\u4e00\u3001burst\u6848\u4f8b\u516d\u7ea0\u6b63<br \/>\nconstexpr uint64_t N &#061; 64;<br \/>\n\u00a0<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/ ORIGINAL \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\nvoid example(ap_int&lt;24&gt; a[N], ap_int&lt;24&gt; b[N]) {<br \/>\n#pragma HLS INTERFACE m_axi port &#061; a depth &#061; N bundle &#061; gmem0<br \/>\n#pragma HLS INTERFACE m_axi port &#061; b depth &#061; N bundle &#061; gmem1<br \/>\n\u00a0 ap_int&lt;24&gt; buff[N];<br \/>\n\u00a0 for (size_t i &#061; 0; i &lt; N; &#043;&#043;i) {<br \/>\n#pragma HLS PIPELINE II &#061; 1<br \/>\n\u00a0 \u00a0 buff[i] &#061; a[i];<br \/>\n\u00a0 \u00a0 buff[i] &#061; buff[i] &#043; 100;<br \/>\n\u00a0 \u00a0 b[i] &#061; buff[i];<br \/>\n\u00a0 }<br \/>\n}<br \/>\n\u00a0<br \/>\n\/\/\/\/\/\/\/\/\/\/\/\/ UPDATED \/\/\/\/\/\/\/\/\/\/\/\/<br \/>\n\/\/ Replace with power of 2 bits type.<br \/>\nvoid example(int a[N], int b[N]) {<br \/>\n#pragma HLS INTERFACE m_axi port &#061; a depth &#061; N bundle &#061; gmem0<br \/>\n#pragma HLS INTERFACE m_axi port &#061; b depth &#061; N bundle &#061; gmem1<br \/>\n\u00a0 int buff[N];<br \/>\n\u00a0 for (size_t i &#061; 0; i &lt; N; &#043;&#043;i) {<br \/>\n#pragma HLS PIPELINE II &#061; 1<br \/>\n\u00a0 \u00a0 buff[i] &#061; a[i];<br \/>\n\u00a0 \u00a0 buff[i] &#061; buff[i] &#043; 100;<br \/>\n\u00a0 \u00a0 b[i] &#061; buff[i];<br \/>\n\u00a0 }<br \/>\n}<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u95ee\u9898\u6765\u6e90&#xff1a;https:\/\/zhuanlan.zhihu.com\/p\/478941270\u4e8c\u3001\u5177\u4f53\u4ee3\u7801<br \/>\nvoid ReadFeature(ap_uint *feat_map, const TABLE_T *table, const uint32_t table_size,hls::stream&lt;ap_uint&gt; &amp;feat_word_strm)<br \/>\n{TABLE_T voxel_pt_num;TABLE_T pt_id  0;for (uint32_<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,941,190,427],"topic":[],"class_list":["post-100666","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-fpga","tag-190","tag-427"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>HLS\u9ad8\u5c42\u6b21\u7efc\u5408\u8bbe\u8ba1-axi\u4e4bburst\u7ea0\u504f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/100666.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HLS\u9ad8\u5c42\u6b21\u7efc\u5408\u8bbe\u8ba1-axi\u4e4bburst\u7ea0\u504f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u4e00\u3001\u95ee\u9898\u6765\u6e90&#xff1a;https:\/\/zhuanlan.zhihu.com\/p\/478941270\u4e8c\u3001\u5177\u4f53\u4ee3\u7801 void ReadFeature(ap_uint *feat_map, const TABLE_T *table, const uint32_t table_size,hls::stream&lt;ap_uint&gt; 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