Serial interface flash memory apparatus and writing method for status register thereof
AssigneeWinbond Electronics Corp.
InventorsYung-Chen Lin, Ya-Chun Chang
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Abstract
A serial interface flash memory apparatus and a writing method for a status register thereof are disclosed. The writing method for the status register mentioned above includes: receiving a write command with an updated data for the status register; writing the updated data to a volatile latch and set an update flag according to whether or not a write-protected data in the status register is updated by the write command; and writing the data from the volatile latch to the status register according to the update flag when a power down process of the serial interface flash memory apparatus is processed.
Claims16
A writing method for a status register used for a serial interface flash memory apparatus, the method comprising:
- receiving a write command for an update data of a status register;
- determining whether or not a write-protected data of the status register is updated according to the update data, writing an update write-protected data of the update data to a latch which is volatile type and setting an update flag according to a result by the determination;
- and
- when the serial interface flash memory apparatus enters a power down process, writing the data from the latch to the status register according to the update flag,
- wherein, the status register is composed of a plurality of non-volatile memory cells.
A serial interface flash memory apparatus, comprising:
- a status register, composed of a plurality of non-volatile memory cells, the status register stores at least a write-protected data;
- a latch, composed of a volatile memory component;
- a command controller, coupled to the status register and the latch, receiving an write command of an update data of the status register, the command controller determining whether or not the write-protected data of the status register is updated according to the update data, the command controller writing an updated write-protected data of the update data to the latch, and setting an update flag;
- and
- a write control circuit, coupled to the status register and the command controller, when the write control circuit in the serial interface flash memory apparatus is in a power down process, the write control circuit writing the data from the latch to the status register according to the update flag.
Dependencies are inferred from the claim text.