Palmer Dabbelt 6b39db8ce6 Add "NastiMemorySelector", a memory interconnect ... On Hurricane we want to be able to support multiple memory channels but have a fallback to fewer, since the full configuration is going to require a complicated FPGA setup. This adds another sort of interconnect that can switch between having different numbers of top-level memory channels active at chip boot time. This interconnect is a bit funny: changing the select input when there is memory traffic is a bad idea. This is fine for this use case, since we really only care about changing the memory configuration at boot time -- since it'll scramble the memory of the machine it's not so useful, anyway. The advantage is that we don't have to have a full 8x8 Nasti crossbar in our chip, which would be fairly expensive. Changing the crossbar would garble memory as well, so it's not like it would add any extra functionality.		2016-02-16 23:59:01 -08:00
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main/scala	Add "NastiMemorySelector", a memory interconnect	2016-02-16 23:59:01 -08:00