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