bus available (BA) signal

In microcomputer, the control signals of the bus which will normally be in the low state; when activated, it will go to the high state indicating that the microprocessor has stopped and the address bus is available. This will occur if the haltline is in the low state or the processor is in the WAIT state as a result of the execution of a WAIT instruction. In some systems, at such a time all 3-state output drivers will go to their off state, and the other output devices to their normally inactive level.; 微型計算機的總線控制信號。通常為低電平,在微處理器接受其它器件要求占用總線的申 請時就變為高電平,表示微處理器暫停操作,其它設備或器件可以使用地址總線。在暫停信號 線為低電平或微處理器執行了WAIT指令后處于等待狀態時,這種情況就會發生。在某些系統 中,此時它所有的三態輸出驅動器都處于阻斷狀態,其它輸出器件處于正常的準備好狀態。