How to cancel the number of dsim
Publish: 2021-04-22 22:58:03
1. The definition of 8086 pin signal. 8086 is a 40 pin device, in order to facilitate the composition of different scale systems, Intel designed two working modes for 8086. In different working modes, pin definition is different. The definition of learning pin signal lays the foundation for the next step of bus operation sequence and system composition learning< Two kinds of working modes are designed in 8086 chip, which are minimum mode and maximum mode< How to set the working mode
the Mn / MX (minimum / maximum mode control) pin of 8086 CPU is the maximum and minimum mode control signal (label 33), which determines the working mode of 8086. If Mn / MX is connected to + 5V, the CPU works in minimum mode; Mn / MX is grounded, and CPU works in maximum mode
the Mn / MX pin is the signal input pin. When designing the system, the signal is directly connected to + 5V or ground according to the selected working mode<
characteristics of 8086 CPU pins:
most of the pins are multiplexed and time-sharing, because 40 pins are not allocated enough, only part of the pins are time-sharing multiplexed: one pin is used as two pins. The pin diagram of 8086 is shown in Fig. 4.2.1 (the pin diagram of 8088 is also shown in Fig. 4.2.1). There are two definitions for pins 24-31 in the diagram. Brackets indicate the pin definition in maximum mode. First, we introce the pin definition of 8086 in minimum mode. The function of some pins is related to the working mode of CPU: in the minimum mode and the maximum mode, these pins may have different functions.
the Mn / MX (minimum / maximum mode control) pin of 8086 CPU is the maximum and minimum mode control signal (label 33), which determines the working mode of 8086. If Mn / MX is connected to + 5V, the CPU works in minimum mode; Mn / MX is grounded, and CPU works in maximum mode
the Mn / MX pin is the signal input pin. When designing the system, the signal is directly connected to + 5V or ground according to the selected working mode<
characteristics of 8086 CPU pins:
most of the pins are multiplexed and time-sharing, because 40 pins are not allocated enough, only part of the pins are time-sharing multiplexed: one pin is used as two pins. The pin diagram of 8086 is shown in Fig. 4.2.1 (the pin diagram of 8088 is also shown in Fig. 4.2.1). There are two definitions for pins 24-31 in the diagram. Brackets indicate the pin definition in maximum mode. First, we introce the pin definition of 8086 in minimum mode. The function of some pins is related to the working mode of CPU: in the minimum mode and the maximum mode, these pins may have different functions.
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