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Method of externally expanding parallel bus based on embedded ARM CPU

An embedded, bus technology, applied in the direction of electrical program control, comprehensive factory control, etc.

Inactive Publication Date: 2010-08-18
GUODIAN NANJING AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Not a bus interface can suffice

Method used

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  • Method of externally expanding parallel bus based on embedded ARM CPU
  • Method of externally expanding parallel bus based on embedded ARM CPU
  • Method of externally expanding parallel bus based on embedded ARM CPU

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Embodiment Construction

[0020] figure 1 It is a schematic diagram of the hardware composition of the present invention. In hardware design, the ARM data bus, address bus and control bus are all introduced to the pins of the CPLD, and the output ISA bus is also introduced to the pins of the CPLD. After such a connection, no matter how many devices are connected to the extended ISA bus, for ARM, it is only responsible for data interaction with the corresponding CPLD, which can effectively reduce the load of the ARM bus. It avoids the phenomenon that it cannot be driven due to too many devices on the bus, and enhances the driving ability of ARM to peripheral devices. The CPLD is equivalent to an ISA bus bridge here, realizing the bridging function between the ISA bus and the ARM internal bus.

[0021] figure 2 It is a program function diagram of the present invention, on the basis of the hardware platform, their respective pins are defined by software. Then perform corresponding programming accordi...

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Abstract

The invention discloses a method for externally expanding a parallel bus based on an embedded ARM CPU, which comprises is characterized by comprising the following steps: 1) introducing a data bus, an address bus and a control bus of ARM as well as an output bus to pins of the CPLD; 2) defining the pins of the CPLD; and 3) controlling the time sequence of output signals of the CPLD such that the output time sequence matches that of the output bus. The method can modify the program of the CPLD according to different applied interfaces to realize different bus interface specifications for meeting the design requirements of various products.

Description

technical field [0001] The invention relates to a method for realizing external extension of parallel bus based on an embedded ARM CPU, so that the ARM series CPU can be applied to a development platform in the field of industrial control, and can be widely used in applications in the field of industrial control such as measurement and control and communication. Background technique [0002] In the field of industrial control, there are many types of interfaces for engineering field devices. Not a bus interface can suffice. Usually, in order to meet the needs of the site, designers will choose several different CPU platforms as the basis for product development. In order to avoid this phenomenon, it is necessary to design a common platform that does not affect the design and application of the platform when the external interface changes. The external expansion of the parallel bus based on the embedded ARM CPU is actually to unify the bus interface, so that the CPU platfor...

Claims

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Application Information

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IPC IPC(8): G05B19/02
CPCY02P90/02
Inventor 秦成虎马伟东
Owner GUODIAN NANJING AUTOMATION
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