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蜂鸟E203
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4.2 蜂鸟E200简介蜂鸟E200 系列处理器核的特性简介如下。 采用两级流水线结构 能够运行RISC-V指令集，支持RV32I/E/A/M/C/F/D等指令子集的配置组合,支持机器模式（Machine Mode Only） 支持标准的JTAG调试接口以及成熟的软件调试工具 提供成熟的GCC编译工具链 配套SOC提供紧耦合系统IP模块
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Nyuzi-RTL分析
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ifetch_tag_stage 只考虑没被阻塞的thread，不排除在当前周期正在roll back的thread，rollback信号的时序路径critical，影响clock freqency。当选中的thread在同周期正在rollback，invalidate这条指令，通过deasserting ift_instruction_requested。这样会浪费一个周期，但是这种场景不常见。
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<a href="/tags/Nyuzi/">#Nyuzi</a>
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<img src="/cover/mirco_arch.png" srcset="/img/loading.gif" lazyload alt="Nyuzi-微架构分析">
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Nyuzi-微架构分析
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Execution Pipeline 每个core有多个hardware threads. each thread 对于软件来说像是一个独立的processor，有自己的PC和通用寄存器 threads共享算数pipeline和 L1 caches on their core multithreading 为了让shared units busy. A core issues an inst
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<a href="/tags/Nyuzi/">#Nyuzi</a>
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<img src="/cover/superscalar_processor.png" srcset="/img/loading.gif" lazyload alt="《超标量处理器设计》笔记">
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《超标量处理器设计》笔记
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2.2 提高Cache的性能2.2.1 写缓存（write buffer）当D-Cache miss时，需要选择一个cacheline evict，并且读取下级存储器fill，如果evivt cacheline dirty，则需要先write back再fill。由于下级存储器访问时间长，这种串行的先写回再读取会导致D-Cache发生缺失的处理时间变长。此时可以使用Write Buffer解决，d
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2023-11-15
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<a href="/tags/superscalar-processor/">#superscalar processor</a>
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if (!subtitle || !typing) {
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}
var text = subtitle.getAttribute('data-typed-text');
typing(text);
})(window, document);
</script>
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