{"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":198,"pdf_page":214,"physical_index":214,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"99cd7b48921ee24d84c7cdc0a94cc5cb5baa60f0c924fb136d02aacefadf8184"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"电报继电器(TelegraphRelays)—以一定形式组织起来构成逻辑门，然后再形成触发器同样具备保存信息的能力。在前面章节中我们讨论过，一个触发器可以对1位信息进行存储。这样的存储能力要存储一大堆的信息还远远不够，但它却为我们达到目标迈出了坚实的一步。其实知道了如何存储1位信息，很容易就可以想象出如何存储2位、3位或更多位信息。\n\n在第14章的学习过程中，我们一起讨论过由一个反向器、两个与门和两个或非门构成的D型电平触发器，如下图所示。\n\n当时钟输入为1，Q端输出与数据端输入保持一致。但当时钟输入跳变为0时，Q端输出将保持数据端最后一次的输入。除非时钟输入再次还原为1，之后的数据端输入不会影响输出。此触发器的真值表如下。\n\n在第14章的讨论中，这种触发器可以由两种不同特性的电路来实现，而在本章我们仅选择其中一种目的就只是为了保存1位信息。为了更加清楚地表述，我们给输入和输出端重新命名，使其名称与功能相符，如下图所示。\n\n编码—隐匿在计算机软硬件背后的语言\n\n198","previous_page":null,"next_page":199}