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The other point I'm a little worried about is the fact that these chips
want ECC on their memory. If it's a 32 bit memory + 8 bit ECC, doesn't
that mean we need "special" SIMMs, rather than the more common 36 bit
PC SIMMs? Perhaps I'm wrong here also and there is extra ECC memory
configured into the system (not necessarily in the SIMMs)?
1. Memory is 64 bits wide
2. With 64 bit wide memory, you need 8 bits for SECDED
(Single bit Error Correction, Double bit Error Dedection)
3. 64 data bits + 8 ECC bits = 72 bits = 2 x 36 bit memories
No problem - it's no more expensive in terms of memory than one
parity bit per byte, and will correct one bit errors instead of
halting.
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