Design and PCB Layout Considerations for Dynamic Memories interfaced to the Z80 CPU


Tim Olmstead


Interfacing dynamic memories to microprocessors can be a demanding process. Getting DRAMs to work in your prototype board can be even tougher. If you can afford to pay for a multi-layer PCB for your prototype you will probably not have many problems. This paper is not for you. This paper is for the rest of us.

I will break down the subject of DRAM interfacing into two categories; timing considerations for design, and layout considerations. Since information without application is only half the battle, this information will then be applied to the Z80 microprocessor.

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