Memory device addressing apparatus and method
A memory device and address technology, applied in the direction of memory address/allocation/relocation, etc., can solve the problems of high price, insufficient memory, and inability to directly address memory.
Inactive Publication Date: 2009-04-29
MEDIATEK INC
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[0002] When a micro controller (or micro processor) is used in an electronic system to execute programs or process data, it is necessary to use memory or registers to temporarily store data. Generally speaking, the microcontroller only With limited memory addressing capability, the memory addressing capability of the microcontroller limits the memory size that the microcontroller can use. For example, if the memory addressing capability of the microcontroller is 64K, it cannot directly Addressing memory larger than 64K bytes
When the functions of the system become more and more complex, the memory available to the microcontroller may not be enough
[0003] However, if a microcontroller with greater memory addressing capability is used instead, it will cause a significant increase in the manufacturing cost of the electronic system due to its high price, which is not conducive to the price competitiveness of manufacturers.
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[0011] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.
[0012] FIG. 1 is a block diagram of an embodiment of an addressing device of the present invention, wherein the addressing device 10 can address a memory device 13 according to an address in an address space. The address space can be regarded as a collection of multiple addresses, and the number of addresses is the size of the address space. The larger the number of addresses, the larger the address space, and vice versa. The size of the address space represents the strength of the addressing ability. The stronger the addressing ability, the larger the storage space that can be addressed. For example, a 64K address space has 64K addresses that can be used for addressing. If each Each address corresponds to one byte of storage space, so the addressable storage space of the 64K address space is 64K bytes. ...
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The invention discloses an addressing device and a method thereof. The device and the method can cause an electronic device with minor addressing capability to address a memory device with larger storage space so as to lower the manufacturing cost of an electronic system. The addressing device comprises an address decoding unit and an address conversion unit; the address decoding unit receives a first access address in a smaller address space, and decides whether to map the first access address to the memory device, and the address conversion unit is coupled to the address decoding unit. When the first access address is mapped to the memory device, the address conversion unit converts the first access address into a second access address in the larger storage space according to an adjustable base address.
Description
technical field [0001] The invention relates to an addressing of a memory device, especially an addressing device and method for enabling a microcontroller with a small memory addressing capability to use a larger memory. Background technique [0002] When a micro controller (or micro processor) is used in an electronic system to execute programs or process data, it is necessary to use memory or registers to temporarily store data. Generally speaking, the microcontroller only With limited memory addressing capability, the memory addressing capability of the microcontroller limits the memory size that the microcontroller can use. For example, if the memory addressing capability of the microcontroller is 64K, it cannot directly Addresses memory larger than 64K bytes. When the functions of the system become more and more complex, the memory available to the microcontroller may be insufficient. [0003] However, if a microcontroller with a larger memory addressing capability i...
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IPC IPC(8): G06F12/02
Inventor 王志明苏肇平蔡宜龙黄名宏
Owner MEDIATEK INC