26 Dec '12, 1pm

Interfacing a GPU with a CPU

Interfacing a GPU with a CPU

We’ve seen quite a number of posts from her regarding the AVR-powered GPU . So far the development of that component has been happening separately from the 6502 centered CPU . But putting them together is anything but trivial. The timing issues that were so important to consider when developing the GPU get even hairier when it comes writing to the VRAM from an external component. Her first thought was to share a portion of the external RAM between the CPU and GPU as a way to push rendering commands from one to the other. This proved troublesome both in timing and in the number of pins available on the AVR chip. She ended up using something of a virtual register on the AVR chip that can receive commands from the CPU asynchronously. Timing dictates that these commands be written only during vertical blanking so this virtual register also acts as a status register to let the ...

Full article: http://hackaday.com/2012/12/26/interfacing-a-gpu-with-a-cpu/

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