diff --git a/Readme.md b/Readme.md index e69de29..256fbdb 100644 --- a/Readme.md +++ b/Readme.md @@ -0,0 +1,77 @@ +\# Voodoo 2 (TMU) MemTest + + + +This tool is an attempt to help troubleshooting Voodoo² TMU's issues. + + + +TMU system can be very hard to fix because there are so many connexions. + + + + + +\## TMU0 Memory test + +  + +  ┌────────────┐ 3 ┌───────────┐ + +  │ ┼─────► │ + +  │ TMU0 │ │ TMU0 RAM │ + +  │ ◄─────┼ │ + +  └──▲──────┬──┘ └───────────┘ + +  │ │ 4 + +  │ │ + +  2 │ │ 5 + +  │ │ + +  ┌──┼──────▼──┐ 6 ┌───────────┐ + +  │ ┼─────► │ + +  │ FBI │ │ FBI RAM │ + +  │ ◄─────┼ │ + +  └──▲───────┬─┘ 7 └───────────┘ + +  │ │ + +  │ │ + +  1 │ │ 7 + +  │ │ + +  ┌──┼───────▼─┐ + +  │ │ + +  │ CPU │ + +  │ │ + +  └────────────┘ + + + +* 1 : CPU configure texture base address and write data to the FBI +* 2 : The FBI streams the texture to the TMU +* 3 : The TMU writes the texture into his private memory +* 4 : The CPU sends a request to the TMU (through the FBI) to render a triangle using this texture (double the size) +* 5 : The TMU streams the rendered pixels to the FBI +* 6 : The FBI writes the pixel to the frame buffer +* 7 : The CPU requests the pixels using the Linear Frame Buffer access +* x : The CPU can compare the rendered value with the original texture + +  +