Reference frequency setting method, memory controller and memory storage device
A memory controller and reference frequency technology, applied in the direction of generating/distributing signals, etc., can solve problems such as inaccurate reference frequency and failure of USB devices to meet test specifications
Active Publication Date: 2014-09-10
PHISON ELECTRONICS
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Problems solved by technology
Therefore, when the frequency of the remote host is not available for reference, the reference frequency generated by the non-quartz oscillator circuit may be inaccurate, causing the USB device to fail to meet specific test specifications
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[0100]In the reference frequency setting method proposed by the exemplary embodiment of the present invention, the adjustment setting of the reference frequency is recorded in the rewritable non-volatile memory or the storage unit of the memory storage device. When the card opening procedure is executed, the memory storage device can directly store the set value of the reference frequency in the memory storage device through the accurate reference frequency provided by the host system, or use the frequency tracking method to track the reference frequency provided by the host system. Adjust the frequency setting required by its on-chip oscillator circuit module. The set value of the reference frequency is stored in the rewritable non-volatile memory module or storage unit in the form of firmware, which is used as the initial frequency of the next power-on, thereby reducing the difference between the reference frequency of the oscillator circuit module and the host frequency. . ...
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Provided are reference frequency setting method for a memory storage device, a memory controller and the memory storage device. The reference frequency setting method comprises the steps of utilizing a first signal transmission path to read set codes including first set information from a memory module or a storage unit, and storing the set codes in a register circuit; detecting whether data of specific frequency are input; if the data of specific frequency are not input, reading the set codes stored in the register circuit so as to enable an oscillating circuit module to generate a first reference frequency according to the first set information of the set codes; if the data of specific frequency are input, utilizing a second signal transmission path to update the set codes stored in the register circuit, and reading the set codes which are stored in the register circuit and have been updated so as to enable the oscillating circuit module to generate a second reference frequency according to second set information; and enabling the set codes having been updated to comprise the second set information.
Description
technical field [0001] The present invention relates to a reference frequency setting method, and more particularly, to a setting method for recording a reference frequency in a memory and a memory controller and memory storage device using the method. Background technique [0002] Universal Serial Bus (Universal Serial Bus, hereinafter referred to as USB) devices are already very common and mature products in the consumer market. In order to generate a more accurate reference frequency for the operation of the electronic device, a common method is to use an external circuit, that is, a quartz oscillator circuit to generate it. In the related art, if the characteristics of the oscillator circuit in the chip need to be adjusted, the manufacturer usually uses a hardware component, such as an electronic fuse (e-fuse) or a trim pad (trim pad), during the card opening process. Record the adjusted settings. However, on the one hand, the quartz oscillator circuit is expensive, an...
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Inventor 陈志铭陈安忠
Owner PHISON ELECTRONICS