{"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":204,"pdf_page":220,"physical_index":220,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"4966c3dc355dd730780fd0a460221974779d98db2cbf8ac5f0d0c952d76afc30"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"为了能圆满完成任务，我们需要另外一款电路元件，而且这款元件与8-1选择器功能类似，但它的作用正好相反。我们所说的正是3-8译码器（3-to-8Decoder)。前面的章节中我们曾学习过一个简易的数据译码器(Data Decoder)——在第11章中为了选择喜欢的猫咪的毛色，我们把开关以一定方式进行连接使其具有选择功能。\n\n3-8译码器的输出端口共有8个。在任何时刻，译码器只会有一个锁存器的输出为1，其余均为 $\\mathbf { 0 } _ { \\circ }$ 每一个输出端的结果都是由 $\\mathbf { S } _ { 0 } , \\ \\mathbf { S } _ { 1 } , \\ \\mathbf { S } _ { 2 }$ 这三个信号的排列组合决定的。而数据的输出和输入一致，如下图所示。\n\n编码隐匿在计算机软硬件背后的语言\n\n204","previous_page":203,"next_page":205}