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File name:BIGMAC_MMU.pdf
[preview BIGMAC_MMU]
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Descr: apple bigmac BIGMAC_MMU.pdf
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BIGMAC_MMU.pdfBig Mac MMUSpeclflcation Introduction: The Big Mac MMU is a memory management unit intended for use with the Motorola MC68020. The MMU features a 64 entry, fully associative cache that maps 4096 byte pages from the logical address bus of the MC68020 to the physical address bus of main memory. This allows a logical (virtual) memory space of 4 Gbytes; a maximum physical memory space of 16 Mbytes and a 256 Kbyte user working set. The MMU operates on the upper 20 bits of the logical address yielding the upper 12 bits of the phyical address. The lower 12 bits of the logical address bus are passed straight through to the physical address bus. 68020 CPU BERR 32 bit logical address 12 bit page offset 20 bit logical page address ...- -...- - - - - - - -... 12 bit physical. page address

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