KR20050120341A - Memory card share method of multiple cpu - Google Patents

Abstract

The present invention relates to a memory card in multiple CPUs, in particular, in order to process multiple functions in multifunction composite mobile devices and computing devices, when a CPU having two or more different performances is applied, a plurality of CPUs can be used without a separate protocol. A memory card sharing device in multiple CPUs that can be easily accessed.

When accessing a single memory card from a multi-function device using multiple CPUs, each CPU can be accessed by simply checking the memory card access status between the CPUs, without using any protocol, using the electrical specifications of each CPU. It can access a single memory card independently, reduce power consumption, improve processing speed, and reduce manufacturing costs by not using a separate control CPU.

Description

Memory card sharing device in multiple CPI {Memory card share method of multiple CPU}

TECHNICAL FIELD The present invention relates to the sharing of memory cards. In particular, in order to handle various functions in multifunctional composite portable devices and computing devices, when a CPU having two or more different performances is applied, the memory card can be easily accessed without a separate protocol. A memory card sharing device in multiple CPUs.

In general, a central processing unit (CPU) is a part of a computer system that has a circuit that controls the interpretation and execution of instructions. The central processing unit (CPU) comprises computer hardware together with memory and input / output devices. The central processing unit is the part of the human brain in the computer that controls and manages the entire computer system and performs the operation and logical manipulation of data. Hardware elements in the central processing unit for performing such a task include an arithmetic logic unit (ALU), a control unit, a register, and a memory interface. Usually, the CPU of a large computer has a large cabinet or circuit board, but in a small computer, a microprocessor chip composed of VLSI performs the function of the CPU. Recently, a plurality of central processing units have been used in multifunctional composite devices.

Hereinafter, embodiments of the prior art will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a configuration of accessing a memory card when a plurality of CPUs are used in a conventional multifunction device or computer.

The configuration consists of a plurality of CPU 10 and a separate memory card control CPU 20 to interface the plurality of CPU 10 to access the memory card 30.

When the plurality of CPUs 10 access the memory card 30, the memory card control CPU 20 matches protocols and electrical specifications between the CPU 10 and the memory card 30 to control commands and data. A separate memory card control CPU 20 was used to transmit and receive.

In a conventional multifunctional portable device or a computer using a plurality of CPUs, the CPU 10 and the memory card from the memory card control CPU 20 are essentially required for the multiple CPUs 10 to access a single memory card 30. There is a hassle to match the protocol settings and electrical specifications between the 30 and the power consumption by continuously using the CPU 10, the control function CPU 20, two or more CPUs to access one memory card 30 There is an increasing problem.

In addition, in the related art, the CPUs on the platform indirectly access the memory card 30 via a separate memory card control CPU, thereby increasing the processing path and decreasing the processing speed of data and control signals.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In the multi-function device using a plurality of CPUs, a CPU does not require a separate protocol when accessing a single memory card. It is an object of the present invention to provide a memory card sharing method in multiple CPUs in which each CPU can independently access one memory card and reduce power consumption by checking the memory card access state of the memory card.

Memory card sharing apparatus in multiple CPUs of the present invention for achieving the above object, a plurality of CPUs performing different functions, a memory card for receiving instructions and storing data when the CPU is connected, and a plurality of And a memory card repeater configured to provide data transmission and reception and control paths when the CPU accesses the memory card, and a CPU status indicating unit for identifying that the CPU is being connected when the CPU accesses the memory card. . Also. The CPU status indicating unit may include, when one of the plurality of CPUs accesses the memory card, control to block the other CPU from accessing the memory card until the CPU completes the operation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 shows a configuration of an apparatus capable of sharing a memory card in multiple CPUs of the present invention.

According to the present invention, even without a protocol for accessing a separate memory card by a plurality of CPUs, each CPU is independent by simply checking the state of accessing memory cards between the CPUs, while using the electrical specifications of each CPU as they are. One memory card can be accessed, and power consumption can be reduced as compared with the conventional method.

Further, in the related art, as the plurality of CPUs 10 on the platform indirectly access the memory card 30 through one control CPU 20 as shown in FIG. 1, the processing path is increased and the processing speed is slow. Each CPU can access the memory card directly to speed up processing without going through a separate control CPU.

2 shows a plurality of CPUs 80 to 86, a CPU status indicating unit 86 that indicates whether or not the CPU 80 is accessing the memory card 90, and the CPUs 80 to 86 display the memory card 90. It consists of a memory card repeater 88 which is routed and relayed for access.

When one CPU 1 (80) controls the data stored in the memory card 90 via the memory card repeater 88, the CPU status indicating unit 88 is the CPU 1 (80) is a memory card 90 ) Is being accessed.

In order to access the memory card 90, the plurality of CPUs 80 to 86 first access the CPU status indicating unit 88 to determine whether another CPU is connected, and to connect to the memory card when not in use. .

When CPU 1 (80) accesses the memory card 90 via the memory card repeater 88, and other CPUs 2, 3 (82, 84) attempt to access the memory card 90 during operations such as data control. The CPU status indicating unit 88 transmits an inaccessible signal to inform that the memory card cannot be accessed, and after the CPU 1 (80) completes the access of the memory card 90, the CPU 2, 3 (82, 84) again returns. When trying to access the memory card 90, the CPU status indicating unit 88 transmits an accessible signal so that the memory card 90 can be accessed via the memory card repeater 88.

According to the present invention, when accessing a single memory card in a multi-function device using a plurality of CPUs, without accessing a separate protocol, each CPU checks the memory card access state while using the electrical specifications of each CPU as it is. CPU can independently access one memory card.

As described above, the present invention allows a plurality of CPUs to directly access a single memory card without a separate control CPU, thereby reducing power consumption and improving processing speed, and thus reducing manufacturing costs by using a separate control CPU. There is a significant savings effect.

1 illustrates a configuration of accessing a memory card when a plurality of CPUs are used in a conventional multifunction device or computer.

2 illustrates an apparatus capable of sharing a memory card in multiple CPUs of the present invention.

<Description of the symbols for the main parts of the drawings>

10, 80, 82, 84: CPU 20: Memory Card Control CPU

30, 90: Memory card 86: CPU status indicator

88: memory card repeater

Claims (2)

A plurality of CPUs performing different functions; A memory card for receiving instructions and storing data when the CPU is connected; A memory card repeater configured to provide data transmission and reception and control paths when the plurality of CPUs access the memory card; And a CPU status indicating unit for identifying and providing that the CPU is connected when the CPU accesses the memory card. The method of claim 1, The CPU status indicating unit, When one CPU of the plurality of CPUs accesses the memory card, controlling another CPU to block access to the memory card until the CPU completes an operation. Memory card sharing device.