Modularization frequency division unit and frequency divider

Abstract

The invention discloses a modularized frequency-dividing unit and a programmable frequency divider. The modularized frequency-dividing unit comprises three cascade D triggers with setting / resetting terminals, a multi-way switch and a logic gate receiving frequency dividing ratio and controlling input, and the logic gate outputting mode status signals. The frequency divider is provided with: an input terminal of a signal waiting for frequency division, which is used for receiving frequency division periodical signals; a frequency division output terminal used for outputting the signal after the frequency division; N frequency dividing ratio control terminals used for selecting the frequency dividing ratio of the frequency divider. The frequency-dividing unit of the invention has the advantage of modularization, and is convenient for being cascaded into the frequency divider. When the frequency dividing ratio scope of the frequency divider is needed to be expanded, only the frequency-dividing unit with needed number is required to be cascaded behind the original frequency divider, and other control circuits are not required to be re-designed.

Description

technical field [0001] The invention relates to a modular frequency division unit and to a frequency divider composed of the frequency division unit. Background technique [0002] Integrated circuits based on metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) technology are currently widely used. For example, a large number of integrated circuits are used in personal computers, consumer electronics, and communication equipment. Complex circuitry often includes clocks of multiple frequencies in order to allow its various components to function correctly. For example, because the CPU and RAM generally work at different clock frequencies, in a computer system, it may be necessary to properly divide the frequency of a clock signal from the same source and provide it to the CPU and RAM to keep them working synchronously. To achieve this function, frequency dividers are often used in integrated circuits. [0003] figure 1 A block diagram of a conventiona...

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Problems solved by technology

[0006] In order to solve the disadvantages that the frequency divider in the prior art does not have modular properties, is not conducive to expansion, and cannot be applied to a wide range of adjustments to the frequency division ratio of the frequency divider, the purpose of the present invention is to provide a frequency division ratio of 2 or 3 modular frequency division unit (2 / 3 frequency division unit), and the multi-mode frequency divider adopting this modular frequency division unit, are suitable for high-speed applications. Therefore, the present invention provides a modular frequency division unit frequency unit and frequency divider

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