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De multiplexing Address Data Bus (AD7- AD0)
As it is already discussed that lower order address bus (A7- A0) is multiplexed with data bus (D7- D0). Hence pins for these two things are denoted by (AD7- AD0). Microprocessor provides address during earlier part of the operation on these pins. Then provides data on the same pin during later part of the operations ( see timing diagram also in chapter7).
ALE ( Address Latch Enable ) signal is used to de multiplex these address data bus.
ALE goes high during earlier part of the operation which enable the latch (see fig) when the latch ( 74LS373) is enabled the address supplied by the microprocessor is available on the order side for the latch on the low order address bus. The high order address is always available on A15 - A8 line which are dedicated for high order address only. In this way complete address is available line the address bus (A15 - A0) which will memory address is located on the primary memory of the microprocessor. Once the memory address is located ALE goes low which disables the latch hence blocks the bits available on multiplexed lines(AD7 -AD0) which may flow from microprocessor to memory ( or I/ O) or vice versa.
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