{"resolved":true,"match_type":"uuid","source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","requested_by":"printed_page","book":{"source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","id":"38270854-596f-4a26-8183-db8c968c6020","uuid":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","normalized_title":"编码隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","isbns":["9787121181184","0123456789","6044921875","3039331000","0000000000","0000000000000"],"parsed":true,"ai_readable":true,"document_type":"book","page_count":438,"navigation_url":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020","title_url":"https://workshop.closeclaw.top/ai/title/%E7%BC%96%E7%A0%81%20%E9%9A%90%E5%8C%BF%E5%9C%A8%E8%AE%A1%E7%AE%97%E6%9C%BA%E8%BD%AF%E7%A1%AC%E4%BB%B6%E8%83%8C%E5%90%8E%E7%9A%84%E8%AF%AD%E8%A8%80","fixed_page_url_template":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","path_api_url_template":"https://workshop.closeclaw.top/api/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","read_url":"https://workshop.closeclaw.top/api/ai/read/38270854-596f-4a26-8183-db8c968c6020","page_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/page","search_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/search"},"page":{"printed_page":179,"pdf_page":195,"physical_index":195,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"d11356de45e9fef681d45236f38504ddc960476ac72bb08ae141e40044ab8f70"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"表中箭头表示当时钟端由0变为1时（称为时钟信号的“正跳变”，“负跳变”是指从1变为0)，Q端输出与数据端输入是相同的。触发器的符号如下图所示。\n\n图中的小三角符号表示触发器是边沿触发的。\n\n下面展示的是一个使用边沿D型触发器的电路，这个电路是不能用电平触发形式复制出来的。先回忆一下本章开始构造的振荡器，其输出在0和1之间变化。\n\n把振荡器的输出与边沿触发的D型触发器的时钟端输入连接，同时把 $\\overline { { \\mathbf { Q } } }$ 端输出连接到本身的D输入端。\n\n这个触发器的输出同时又是它自己的输入。反馈紧接着反馈！（实际上，这种构造可能是有问题的，振荡器是由状态来回迅速改变的继电器构成的，其输出与构成触发器的继电器相连，而这些其他的继电器不一定能跟得上振荡器的速度。为了避免这些问题，这里假设振荡器中的继电器比电路中其他地方的继电器速度要慢得多)\n\n仔细看一看下面的功能表就可以明白在电路中发生的情况了，电路启动时，假设时钟输入为0且Q输出也为0，则 $\\overline { { \\mathbf { Q } } }$ 端输出为1，而 $\\mathbf { \\widehat { Q } }$ 是和D端输入相连的。\n\n14 反馈与触发器\n\n179","previous_page":178,"next_page":180}