| 术语 | bus available (BA) signal |
| 释义 | bus available (BA) signal 总线可用信号;［汇流排使用可能信号］ 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. 微型计算机的总线控制信号。通常为低电平,在微处理器接受其它器件要求占用总线的申 请时就变为高电平,表示微处理器暂停操作,其它设备或器件可以使用地址总线。在暂停信号 线为低电平或微处理器执行了WAIT指令后处于等待状态时,这种情况就会发生。在某些系统 中,此时它所有的三态输出驱动器都处于阻断状态,其它输出器件处于正常的准备好状态。 |
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