{"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":225,"pdf_page":241,"physical_index":241,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"edd23a934750903f532bfc33102a62f87c4d9b3c92303692c13ab55526f82504"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"上图缺少的是控制所有这些组件的信号，它们统称为控制信号，包括16位计数器的“时钟”输入和“清零”输入，8位锁存器的“时钟”输入和“清零”输入，数据RAM阵列的“写”（W）输入，2-1选择器的“选择”（S）输入。其中的一些信号很明显是基于代码RAM阵列的输出，例如，如果代码RAM阵列输出是Load指令，那么2-1选择器的“选择”输入必须是0（即选择数据RAM的输出）。只有当操作码是指令 Store时，数据RAM阵列的“写”(W)输入必须是1。这些控制信号可以通过逻辑门的各种组合来实现。\n\n利用最少的附加硬件和一些新增的操作码，可以让这个电路从累加器中减去一个数。第1步是向操作码表增加一些代码。\n\n17 自动操作\n\n225","previous_page":224,"next_page":226}