{"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":224,"pdf_page":240,"physical_index":240,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"350413f948cc3b6236a961e307ee5893e5366ddd96e3b3829647973353999cf3"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"如前所述，最初的自动加法器的8位锁存器的输出要作为数据RAM阵列的输入，这就是Save指令的功能。还需要做另一个改变：以前8位加法器的输出是8位锁存器的输入，但现在为了执行Load指令，数据RAM阵列的输出有时也要作为8位锁存器的输入，这种新的变化需要一个2-1选择器来实现。改进后的自动加法器如下图所示。\n\n图中略去了一些组件，但是仍然清晰地描述了各个组件之间的8位数据通路。16位的计数器为两个RAM阵列提供地址输入。通常，数据RAM阵列的输出传入到8位加法器执行加操作。8位锁存器的输入可以是数据RAM阵列的输出（当执行Load指令时)，也可以是加法器的输出（当执行Add指令时)，这种情况下就需要2-1选择器。通常，锁存器电路的输出又流回到加法器中，但是当执行Save指令时，它就成为了数据RAM阵列的输入数据。\n\n编码隐匿在计算机软硬件背后的语言\n\n224","previous_page":223,"next_page":225}