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A kind of access control method and system and main control board

A technology of access control and normal access, which is applied in the direction of instrumentation, electrical digital data processing, etc., can solve the problems of easy misoperation, additional software configuration, equipment complexity, etc., and achieve the effect of hot swapping and eliminating abnormal phenomena

Active Publication Date: 2015-08-12
RAISECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] But doing so will increase the additional configuration of the software or add various buttons to the hardware of the device
However, the equipment is complicated, the operation is cumbersome, and it is easy to cause misoperation

Method used

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  • A kind of access control method and system and main control board
  • A kind of access control method and system and main control board
  • A kind of access control method and system and main control board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The application scenarios used in this embodiment are as follows:

[0062] The central processing unit (CPU) of the main control board sends a chip selection signal, and the response signal of the accessed chip to the chip selection signal is a TA signal, which indicates the response of the completion of data transmission. For the CPU, the time it takes for one access is the period from when the CPU sends the chip select signal to when it receives the TA signal fed back from the chip being accessed, which is commonly referred to as the normal access cycle. in:

[0063] figure 2 It is a sequence diagram of normal CPU access in the application scenario of Embodiment 1 of the present invention;

[0064] It can be seen from the figure that in this application scenario, the chip selection signal is valid when it is at a low level, and on the contrary, it is invalid when the chip selection signal is at a high level. The TA signal is valid when it is low level, on the cont...

Embodiment 2

[0084] Figure 5 It is a sequence diagram of normal CPU access in the application scenario of Embodiment 2 of the present invention.

[0085] exist Figure 5 In the timing diagram shown, the CPU sends a chip select signal, and the chip outputs a response signal READY signal after receiving the chip select signal, where the pulse of the READY signal is a negative pulse, and the CPU samples the negative pulse to obtain the nEWAIT signal, End this visit.

[0086] Figure 6 It is a sequence diagram when the service board is pulled out during the CPU read or write operation to the chip in the application scenario of the second embodiment of the present invention.

[0087] through with Figure 5 It can be seen from the comparison that after being pulled out, the interface that outputs the READY signal is in a floating state and maintains a certain value of current, so the READY signal is always at a low level, so there is no Figure 5 In the case of the negative pulse shown, th...

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Abstract

The invention provides an access control method and system and a main control panel. The access control method comprises the following steps of: with adoption of a CPU (central processing unit) and a chip which are arranged on different boards, in a process that the CPU accesses the chip, if detecting that a first response signal of the chip fed back to the CPU access can not indicate finish of the CPU access, adjusting the first response signal to be a second response signal which can indicate finish of the CPU access, and sending the second response signal to the CPU.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to an access control method and system and a main control board. Background technique [0002] In order to meet the needs of different users and different services at the same time, a variety of devices are designed with plug-in cards, aiming at resource allocation for different users and business categories. [0003] The central processing unit (CPU) and the chip communicate between boards, that is, the CPU and the chip are located on different boards. There are two commonly used ones: [0004] One is multiple central processing units (multiple CPUs) for distributed control. Usually, there is a central processing unit (CPU) on the main control board, and a central processing unit (CPU) on the service board. The communication between the two uses various communication protocols to interact. [0005] The other is a single central processing unit (single CPU). Only the main cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/14
Inventor 齐建明
Owner RAISECOM TECH
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