![]() ![]() ![]() The ALE pin helps to enable the latching of lower order ADDR bus. Whenever 8085 starts any new operation, ALE signal goes to logic 1 for about 12 clock cycle, at about the falling edge of CLK.Īfter that half clock cycle, it goes to logic 0 for nearly 3 or 4 clock cycles. The control signals for Maximum mode of operation are generated by the Bus Controller chip 8788.ĪLEAddress Latch Enabled.(pin number 30 in 8085) 8085 has a special pin referred as ALE, which indicates whether multiplex bus functions as an address bus or a data bus. The Memory, Address Bus, Data Buses are shared resources between the two processors. In the maximum mode of operation of 8086, wherein either a numeric coprocessor of the type 8087 or another processor is interfaced with 8086. ![]() The Data transceiver block which helps the signals traveling a longer distance to get boosted up. This is similar to 8085 block diagram with the following difference. These four chip select signals can be used to select one of the four memory IC at any one time.Ī minimum mode of 8086 configuration depicts a stand alone system of computer where no other processor is connected. The address lines and A13 - A14 can be decoded using a 2-to-4 decoder to generate four chip select signals. ![]()
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