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by loup-vaillant
1853 days ago
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> Most fpgas are exactly mini async srams used as LUTs Most fpgas contain mini async srams used as LUTs. It's very different from using one giant LUT, which is what abusing memory chips is all about. The LUTs we find if FPGAs are very small, often with as little as 6 input bits. Because the size of the LUT grows exponentially with the number of inputs, there's a natural sweet spot: two few inputs, and the LUT isn't powerful enough. Too many, and the LUT is too bloated. Using a 64K ROM to encode a 16-bit LUT definitely leans in towards "way too bloated" for me. |
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