本文介紹了利用計算機ISA、PCI總線和打印機接口設(shè)計密碼電路?；?a href='http://www.brongaenegriffin.com/tags/cpld/' target='_blank' class='arckwlink_none'>CPLD設(shè)計密碼電路，具有加密性能好的特性。通過并行打印機接 口設(shè)計一個密碼電路，密碼存儲在電路中，通過操作接口讀取密碼。ISA總線可以直接讀取電路密碼，PCI總線可以W89C940af對密碼電路進行操作，讀取設(shè)置密碼。
關(guān)鍵詞：計算機；密碼電路；ISA和PCI總線
Abstract: The paper proposes a password circuit that by using computer ISA and PCI bus and printer interface. A password circuit is designs by using CPLD. Its characteristic is very secure. Using serial printer interface designs a circuit of password deposited in circuit. The circuit may read and get passwords. ISA buses read and get passwords directly. PCI buses
may be manipulated by W89C940af in order to read and get and set passwords.
Key words: computer; password circuit; ISA and PCI buses