Interface circuit and access mode selection method of serial interface memory
A serial interface and interface circuit technology, applied in the direction of instruments, electrical digital data processing, etc., can solve the problems of affecting product cost, increasing the circuit area, packaging particle size, limiting the maximum frequency of the system, etc., and achieving the effect of improving performance
Active Publication Date: 2017-08-29
WINBOND ELECTRONICS CORP
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Problems solved by technology
[0003] In the existing technical field, when accessing the flash memory of the serial peripheral interface, a multi-bit data access can be performed by adding hardware pins, but this method obviously needs to increase the circuit area As well as the size of the package particle, which affects the cost of the product
In addition, the existing technical field also speeds up the system frequency of the flash memory of the serial peripheral interface to increase its access efficiency, but in this way, the entire flash memory must be designed to be able to operate within a larger system frequency range. Under normal operation, such a design often requires a large circuit area to complete, and is also limited by the maximum frequency that the system can operate
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[0036] Please refer to the following figure 1 , figure 1 A schematic diagram of an interface circuit 100 according to an embodiment of the present invention is shown. The interface circuit 100 is for a serial interface memory, such as a flash memory of a serial peripheral interface. The interface circuit 100 includes a controller 110 , a multiplied clock generator 120 , a clock controller 150 and a selector 130 . The controller 110 receives the serial interface control signal SPS, and the controller 110 receives the control command. The controller 110 decodes the control command to generate the multiplied clock actuation signal MS, and generates the mode switching signal MS1 through the clock controller 150 . Wherein, when the control command instructs the multiplied clock generator 120 to perform frequency multiplied operation on the system clock signal SCK, the multiplied clock activation signal MS and the mode switching signal MS1 may be the same. The multiplied clock g...
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The invention discloses an access mode selecting method for an interface circuit and a serial interface memorizer. The interface circuit comprises a controller, a frequency doubling clock rate generator, a selector and a clock rate controller. The controller receives a control order and decodes the control order to generate a frequency doubling clock rate actuation signal, and the clock rate controller generates a mode switching signal according to the frequency doubling clock rate actuation signal. The frequency doubling clock rate generator receives a system clock rate signal and the frequency doubling clock rate actuation signal and carries out the frequency doubling action on the system clock rate signal according to the frequency doubling clock rate actuation signal to generate a frequency doubling clock rate signal. The selector receives the system clock rate signal, the frequency doubling clock rate signal and the mode switching signal, and the clock rate signal or the frequency doubling clock rate is selected to serve as a selected access clock rate of the serial interface memorizer according to the mode switching signal.
Description
technical field [0001] The present invention relates to an interface circuit, and in particular to an interface circuit capable of switching between access modes of single transmission rate and double transmission rate. Background technique [0002] With the advancement of electronic technology, consumer electronic products have become an indispensable and necessary tool in people's life. In order to provide electronic products with the recording function of necessary information, various types of memory devices are produced accordingly. In the field of non-volatile memory, a flash memory using a serial peripheral interface (SPI) as a transmission interface has been proposed. The flash memory with the serial peripheral interface can perform enough data access operations with a small number of pins, effectively reducing the demand for circuit area. However, in contrast to data access through the serial interface, how to make the data access can be performed more quickly is ...
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IPC IPC(8): G06F13/16
Inventor 林宏学林继正
Owner WINBOND ELECTRONICS CORP