title: What happens on a DMA controller when it gets selected?
body: <p>I'm trying to learn the ins and outs of an 8237A-5 DMA controller. I've been reading about it and now I've started to design it at the gate level in software. The CS pin is active low. If it gets a high signal on here, do what happens? Do all the other pins just go to high Z? What happens when it gets a low signal?</p>