CN103346771A - Multi-channel switching control circuit compatible with two kinds of protocols and control method - Google Patents

Abstract

The invention discloses a multi-channel switching control circuit compatible with two protocols, including a key pulse control module, a function control module of an independent pin and a logic judgment module, an output terminal of the one key pulse control module and a function of an independent pin The output terminals of the control module are respectively connected with the input terminals of the logic judgment module, and the output terminals of the logic judgment module output channel switching control signals. The invention also discloses a control method adopted by the multi-channel switching control circuit. The function control module of the independent pin includes a high-level input terminal, a low-level input terminal and a function control input terminal, and the logic judgment module controls the input terminal according to the function Comparing with the levels between the high-level input terminal and the low-level input terminal respectively, different channel switching control signals are selected and output. The invention is compatible with two communication protocols and can reasonably control multi-channel selection according to the situation of I/O resources, provides considerable flexibility for system design, and can adapt to more system designs.

Description

Multi-channel switching control circuit and control method compatible with two protocols

technical field

The invention relates to a multi-channel switching control circuit and a control method, in particular to a multi-channel switching control circuit and a control method compatible with two protocols.

Background technique

In integrated circuit design, it is often necessary to switch multiple channels, so the corresponding switching control circuit will be used. At present, the multi-channel switching control circuit mainly has a key pulse control circuit module and a function control circuit module with independent pins. Existing multi-channel switching control circuits only select one of the circuit modules, so there is only one protocol.

With the vigorous development of the modern electronic information industry, electronic products are evolving in a diversified direction. Only one protocol control method lacks design flexibility in system design and is not conducive to the effective use of resources. In the modern new electronic system There are significant limitations in the design. The specific performance is: the function control circuit module with independent pins requires a separate control I/O for control, which will cause a waste of I/O resources in the system design, which is not conducive to the shortage of I/O resources for the main control. Effective application and reasonable allocation of resources; the one-key pulse control circuit module will make the system design more complicated and increase the difficulty of the design because of its multiplexing characteristics, which will cause waste of design cost in the design with rich I/O resources. And reduce the reliability of the system.

Contents of the invention

The object of the present invention is to provide a multi-channel switching control circuit and control method compatible with two protocols in order to solve the above problems.

In order to achieve the above object, the present invention adopts the following technical solutions:

The multi-channel switching control circuit compatible with two protocols of the present invention includes a one-key pulse control module, a function control module of independent pins and a logic judgment module, the output terminal of the one-key pulse control module and the The output terminals of the function control module are respectively connected to the input terminals of the logic judgment module, and the output terminals of the logic judgment module output channel switching control signals.

Specifically, the logic judgment module includes four NOT gates, four AND gates, two NOR gates and a multiplexer, and the input terminals of the first NOT gate are connected with the function control module of the independent pins respectively. An output end of the output terminal, the input end of the third AND gate and the input end of the fourth AND gate are correspondingly connected, and the input end of the second NOT gate is respectively connected with the other output end of the function control module of the independent pin, the second AND gate The input end of the gate is connected to the input end of the third AND gate, the output end of the first NOT gate is respectively connected to the input end of the first AND gate and the input end of the second AND gate, and the second AND gate is connected to the input end of the second AND gate. The output terminals of the NOT gate are respectively connected with the input terminals of the first AND gate and the input terminals of the fourth AND gate, the output terminals of the first AND gate, the output terminals of the second AND gate and the The output end of the third AND gate is respectively connected to the input end of the first NOR gate, the output end of the third AND gate and the output end of the fourth AND gate are respectively connected to the input end of the second NOR gate, The output terminal of the first NOR gate is connected with the input terminal of the third NOT gate, the output terminal of the second NOR gate is connected with the input terminal of the fourth NOT gate, and the output terminal of the third NOT gate is connected with the input terminal of the fourth NOT gate. The output terminals of the fourth NOT gate are respectively connected to the two signal input terminals of the multiplexer, the output terminals of the one-key pulse control module are connected to the selection input terminals of the multiplexer, The output terminal of the multiplexer outputs a channel switching control signal.

The function control module of the independent pin in the control method adopted by the multi-channel switching control circuit compatible with two protocols of the present invention includes a high-level input terminal, a low-level input terminal and a function control input terminal. When the level of the output signal of the function control input terminal (the output signal includes both the switching signal and the logic judgment signal) is higher than the level of the high level input terminal or lower than the level of the low level input terminal, the logic The judgment module selects the output signal according to the different potentials of the output signal of the one-key pulse control module and the output signal of the function control input terminal; when the level of the output signal of the function control input terminal is lower than that of the high level input terminal level and higher than the level of the low-level input terminal, the output terminal of the logic judgment module outputs the output terminal signal of the one-key pulse control module.

The beneficial effects of the present invention are:

The present invention is compatible with two communication protocols to control multi-channel selection, provides considerable flexibility for system design, and can adapt to more system designs; during system design, the control mode can be reasonably selected according to the situation of I/O resources: in In the case of abundant I/O resources, you can choose to use independent function pins for control, which is beneficial to reduce the complexity of system design; and in the case of shortage of I/O resources, you can choose to use a key pulse multiplexing tube The way of pin control can save the control port to reduce the cost of system design.

Description of drawings

Fig. 1 is the overall block diagram of the multi-channel switching control circuit compatible with two protocols of the present invention;

Fig. 2 is the circuit diagram of logical judgment module of the present invention;

Fig. 3 is the circuit diagram of a key pulse control module of the present invention;

Fig. 4 is a circuit diagram of the function control module of the independent pins of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail:

As shown in Figure 1, the multi-channel switching control circuit compatible with two protocols of the present invention includes a key pulse control module, a function control module and a logic judgment module of independent pins, an output terminal of the one key pulse control module and an independent pin The output terminals of the pin function control module are respectively connected with the input terminals of the logic judgment module, and the output terminals of the logic judgment module output channel switching control signals.

As shown in Figure 2, the logic judgment module comprises four NOT gates, four AND gates, two NOR gates and a multiplexer 41, the input terminals of the first NOT gate 11 are respectively connected with the function control of the independent pin One output terminal ABPIN of the module (see Fig. 4), the input terminal of the third AND gate 23 and the input terminal of the fourth AND gate 24 are correspondingly connected, and the input terminal of the second NOT gate 12 is respectively connected with the function control module of the independent pin The other output terminal DPIN (see FIG. 4 ), the input terminal of the second AND gate 22 and the input terminal of the third AND gate 23 are connected, and the output terminal of the first NOT gate 11 is connected with the input terminal of the first AND gate 21 and the input terminal of the first AND gate 21 respectively. The input ends of the two AND gates 22 are connected, the output ends of the second NOT gate 12 are respectively connected with the input ends of the first AND gate 21 and the input ends of the fourth AND gate 24, the output ends of the first AND gate 21, the second AND gate The output end of gate 22 and the output end of the third AND gate 23 are respectively connected with the input end of the first NOR gate 31, and the output end of the third AND gate 23 and the output end of the fourth AND gate 24 are connected with the second NOR gate respectively. The input terminal of the gate 32 is connected, the output terminal of the first NOR gate 31 is connected with the input terminal of the third NOT gate 13, the output terminal of the second NOR gate 32 is connected with the input terminal of the fourth NOT gate 14, the third NOT gate The output terminal of the gate 13 and the output terminal of the fourth NOT gate 14 are respectively connected to the two signal input terminals of the multiplexer 41, and the output terminal SD of the one-key pulse control module (see the output SD in Fig. 3 ) is connected to the multiplexer 41. The selection input terminal of the multiplexer 41 is connected, and the output terminal of the multiplexer 41 outputs a channel switching control signal. The multiplexer 41 is a conventional device, also called a controllable inverter, and its specific structure is shown in FIG. 2 .

As shown in Figure 3, the one-key pulse control module adopts a conventional structure and consists of a NOT gate and two flip-flops.

As shown in Figure 4, the function control module of independent pins adopts a conventional structure, consisting of two comparators and four NOT gates.

In conjunction with Fig. 1, Fig. 3 and Fig. 4, the function control module of the independent pin in the control method adopted by the multi-channel switching control circuit compatible with two protocols of the present invention includes a high-level input terminal V1, a low-level input terminal V2 and the function control input terminal IN, when the level of the output signal of the function control input terminal IN is higher than the level of the high level input terminal V1 or lower than the level of the low level input terminal V2, the logic judgment module The output signal of the pulse control module is different from the output signal of the function control input terminal IN to select the output signal; when the level of the output signal of the function control input terminal IN is lower than the level of the high level input terminal V1 and higher than the level of the low level input terminal When the level of the input terminal V2 is equal, the output terminal of the logic judgment module outputs the output terminal signal of the one-key pulse control module, so as to achieve the purpose of reasonably selecting the control mode according to the situation of the I/O resources.

The above-described embodiment is only a preferred embodiment based on the basic technical solution of the present invention, and cannot limit the protection scope of the present invention with this. Any replacement, combination, separation, and Any equivalent changes or replacements known in the technical field to the control method of the present invention will not exceed the protection scope of the patent of the present invention.

Claims (3)

1. the multichannel control switching circuit of two kinds of agreements of a compatibility, the functional control module that comprises a key pulse control module and individual pin, it is characterized in that: also comprise logic judgment module, the output of the output of a described key pulse control module and the functional control module of described individual pin is connected with the input of described logic judgment module respectively, the output output channel switch-over control signal of described logic judgment module.

2. the multichannel control switching circuit of compatible two kinds of agreements according to claim 1, it is characterized in that: described logic judgment module comprises four not gates, four and door, two NOR gate and a multiplexer, the input of first not gate respectively with an output of the functional control module of described individual pin, the 3rd with the door input with the 4th with corresponding connection of input, the input of second not gate respectively with another output of the functional control module of described individual pin, second with the door input with the described the 3rd with input be connected, the output of described first not gate is connected with the input of door with described second with the input of door with first respectively, the output of described second not gate is connected with the input of door with the described the 4th with the input of door with described first respectively, described first with the door output, described second with the door output with the described the 3rd with output be connected with the input of first NOR gate respectively, the described the 3rd with the door output with the described the 4th with output be connected with the input of second NOR gate respectively, the output of described first NOR gate is connected with the input of the 3rd not gate, the output of described second NOR gate is connected with the input of the 4th not gate, the output of the output of described the 3rd not gate and described the 4th not gate is connected with two signal input parts of described multiplexer respectively, the output of a described key pulse control module is connected with the selection input of described multiplexer, the output output channel switch-over control signal of described multiplexer.

3. the control method that adopts of the multichannel control switching circuit of compatible two kinds of agreements as claimed in claim 1, the functional control module of described individual pin comprises the high level input, low level input and function control input end, it is characterized in that: when the output signal level of described function control input end was higher than the level of described high level input or is lower than the level of described low level input, described logic judgment module was selected output signal according to the different potentials of the output signal of the output signal of a described key pulse control module and described function control input end; When the output signal level of described function control input end was lower than the level of described high level input and is higher than the level of described low level input, the output of described logic judgment module was exported the output end signal of a described key pulse control module.

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