Data padding device and data padding method

A data padding method, adapted for a data padding device comprising an internal memory, a direct memory access (DMA) circuit and a data processing circuit, the data padding method implemented by a processor executing a plurality of instructions, the data padding method comprising:

• controlling the DMA circuit to perform, according to a first padding control signal, data padding in a first direction on raw data during a process of reading the raw data from an external memory to generate first-direction padding data, and to store the first-direction padding data to the internal memory, wherein the first-direction padding data comprises the raw data and first padding data originated from the raw data;
• and
• controlling the data processing circuit to perform, according to a second padding control signal, data padding in a second direction on the first-direction padding data during a process of reading the first-direction padding data from an internal memory to generate second-direction padding data, wherein the second-direction padding data comprises the first-direction padding data and second padding data originated from the first-direction padding data,
• wherein the data padding device further comprises a padding controller, and the controlling of the DMA circuit to perform, according to the first padding control signal, data padding in the first direction on the raw data during the process of reading the raw data from the external memory to generate the first-direction padding data comprises:
• controlling the padding controller to generate the first padding control signal according to an enable signal, wherein the first padding control signal at least comprises a starting address and a data length;
• and
• controlling the DMA circuit to read the raw data from the starting address of the external memory, and to continue reading for the data length to obtain first data of the raw data, wherein the first padding data comprises the first data.