Fast block interleaving or de-interleaving method and device realized by using single-chip memory

The invention provides a fast block interleaving or de-interleaving method realized by using a single-chip memory, which can be applied to the technical field of communication. The method comprises the following steps: responding to a condition that a plurality of internal memories are in a data reading state, and writing initial data stored in a buffer into an external memory; under the condition that a data reading request returned by a target internal memory in the plurality of internal memories is received, determining a first unit offset and a second unit offset related to the external memory based on a preset interleaving depth, a data read-write performance parameter of the external memory and a first data bit width of the external memory; and interleaving and writing the initial data into the target internal memory by using a first row counter and a first column counter related to the initial data based on the first unit offset and the second unit offset. The invention also provides a device and elect