{"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":169,"pdf_page":185,"physical_index":185,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"aa36e8436490eaadef301fbc234ccddd3b1276c176be4b2e925758552a01d52c"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"在前两种情况下，保持位为1，输出Q与数据端输入相同；后面两种情况下，保持位为0，输出端Q和其前一个状态保持一致。值得注意的是，保持位为0意味着输出将不再变化，也就是说不再被数据端所影响，我们可以进一步将真值表简化为如下所示。\n\nX表示“其取值情况与结果无关”，只要保持位的值为0，那么数据位对电路的输出没有影响，电路的输出和其前一个状态相同。\n\n如果使用先前学过的R-S触发器来实现这种具有保持位的功能系统，那么我们的电路需要在输入端增加两个与门，下图所给出了该系统的实现电路。\n\n回忆一下与门，它的特点是只有在输入端都为1的状态下，输出才为 $1 _ { \\circ }$ 在上面这幅图中，输出端Q为0， $\\overline { { \\mathbf { Q } } }$ 为1。\n\n只要保持位为0，则置位端对于输出结果不会有任何影响。\n\n14 反馈与触发器\n\n169","previous_page":168,"next_page":170}