Memory device, access controller thereof and method for accessing memory device

An access controller of a memory device, wherein the memory device comprises a memory array with at least one memory macro, each bit of data stored in the at least one memory macro is presented as a first bit type or a second bit type,

• wherein the access controller comprising:
• a flag;
• and
• a controller, coupled to the memory array,
• wherein the controller is configured to select one of a first situation mode and a second situation mode as a selected situation mode according to a first retention time of the first bit type and a second retention time of the second bit type, wherein the first situation mode is that a number of bits with the first bit type in data is larger than a number of bits with the second bit type in data, and the second situation mode is that the number of bits with the first bit type in data is not larger than the number of bits with the second bit type in data,
• in a write operation of the at least one memory macro, the controller determines that an input data meets a condition for the selected situation mode or not,
• in response to the input data meets a condition for the selected situation mode, the controller disables the flag and writes the input data into the at least one memory macro, and,
• in response to the input data does not meet a condition for the selected situation mode, the controller enables the flag, inverts the input data, and writes an inverted input data into the at least one memory macro,
• wherein the controller determines that the input data meets a condition for the first situation mode as the selected situation mode when the first retention time of the first bit type in the at least one memory macro is greater than the second retention time of the second bit type in the at least one memory macro,
• wherein the controller determines that the input data does not meet a condition for the first situation mode as the selected situation mode when the first retention time of the first bit type in the at least one memory macro is not greater than the second retention time of the second bit type in the at least one memory macro.

A method for accessing a memory device, wherein the memory device comprises a flag and a memory array with at least one memory macro, each bit of data stored in the at least one memory macro is presented as a first bit type or a second bit type,

• wherein the method comprising:
• selecting one of a first situation mode and a second situation mode as a selected situation mode according to a first retention time of the first bit type and a second retention time of the second bit type, wherein the first situation mode is that a number of bits with the first bit type in data is larger than a number of bits with the second bit type in data, and the second situation mode is that the number of bits with the first bit type in data is not larger than the number of bits with the second bit type in data;
• in a write operation of the at least one memory macro, determining that an input data meets a condition for the selected situation mode or not;
• in response to the input data meets a condition for the selected situation mode, disabling the flag and writing the input data into the at least one memory macro;
• and
• in response to the input data does not meet a condition for the selected situation mode, enabling the flag, inverting the input data, and writing an inverted input data into the at least one memory macro,
• wherein the input data is determined to meet a condition for the first situation mode as the selected situation mode when the first retention time of the first bit type in the at least one memory macro is greater than the second retention time of the second bit type in the at least one memory macro,
• wherein the input data is determined to be not meet a condition for the first situation mode as the selected situation mode when the first retention time of the first bit type in the at least one memory macro is not greater than the second retention time of the second bit type in the at least one memory macro.