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motorola:68000 [2015/02/22 21:30]
sarayan [Visualisation] |
motorola:68000 [2015/07/15 20:30]
mcmaster-guest |
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| At the center two inverters are looped to keep the value. Two independant vertical busses a and d are used for both reading and writing. Reading is done by letting the bus float and connecting the memory to the bus with the a ctrl or the d ctrl line. Writing is done by locking a value first on the bus then afterwards connecting the memory bit to the bus. | At the center two inverters are looped to keep the value. Two independant vertical busses a and d are used for both reading and writing. Reading is done by letting the bus float and connecting the memory to the bus with the a ctrl or the d ctrl line. Writing is done by locking a value first on the bus then afterwards connecting the memory bit to the bus. |
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| | ====== References ====== |
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| | * Die revs: http://siliconpr0n.org/media/motorola/motorola_high-performance_internal_product_portfolio_overview.pdf |
| | * Early die revs: https://books.google.com/books?id=kSDVBwAAQBAJ&pg=PA297&lpg=PA297&dq=mc68000+r9m&source=bl&ots=4BaXtdA_QH&sig=u8NOvZCee11l-q4PyF9jsElxanw&hl=en&sa=X&ei=HgluVciGB4W1sATrzILwDA&ved=0CDMQ6AEwAw#v=onepage&q=mc68000%20r9m&f=false |
| | * J5H was first silicon, R9M was second |
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