Why are the read and write control lines in a DMA controller bidirectional? Under what
condition and for what purpose are they used as inputs? Under what condition and for what
purpose are they used as outputs?
In the CPU and DMA controllers. The DMA controller and CPU controller "share" the write and read control lines. They must all be bidirectional. As a result, we can claim that the CPU controller and the DMA controller can both regulate (activate) these lines as necessary. On the other hand, we can state that. When a DMA controller sends a Bus request input (BR) to the CPU and takes control of the Buses, these control lines go via the data buses and include control signals.