Data transmission method and device

A data transmission device residing in an internal memory of a system-on-chip, adapted for data transmission between the internal memory and an external memory coupled to the system-on-chip, wherein the device comprises:

• a task adding module adapted to add execution information of at least one data transmission task to be executed to a task queue;
• a task registration module adapted to send execution information of one data transmission task in the task queue to a direct access device for the direct access device to execute the data transmission task;
• and
• a request response module adapted to receive an interrupt request sent by the direct access device, wherein the interrupt request is used to indicate completion of the execution of the data transmission task;
• and call the task registration module in response to the interrupt request, so that the task registration module sends execution information of a next data transmission task to be executed in the task queue to the direct access device.

A system-on-chip comprising a processor, an internal memory, and a direct access device, the system-on-chip being coupled to an external memory, wherein

• the processor is adapted to add execution information of at least one data transmission task to be executed to a task queue, and send execution information of one data transmission task in the task queue to the direct access device, wherein the data transmission task is adapted to implement data transmission between the internal memory and the external memory;
• the direct access device is adapted to execute the data transmission task according to the received execution information, and send an interrupt request to the processor after completion of the execution of the data transmission task;
• and
• the processor sends execution information of a next data transmission task in the task queue to the direct access device in response to the interrupt request.