The embodiment of the invention provides a
data access method of a
phase change memory, related equipment and a storage medium. In the embodiment of the invention, a small amount of SRAM (
Static Random Access Memory) resources are added in a PCM (
Pulse Code Modulation) controller, and in a writing stage, whether writing operation occurs in each coarse-grained unit time or not can be recorded by utilizing a
bitmap provided by the SRAM; the
Bloom filter provided by the SRAM can be used for recording whether write operation occurs in each fine-grained unit time or not. Therefore, in the subsequent reading stage, even under the condition of large bandwidth, the
bitmap and the
Bloom filter provided by the SRAM resource can be utilized to correctly distinguish the reading
voltage of three gears designed for the
phase change memory, so that the correct reading
voltage responding to a read I / O request can be found at one time with a relatively large probability, the number of Read Retry times is remarkably reduced, and the reading efficiency of the
phase change memory is improved. And the QoS of a
service system using the
phase change memory is greatly optimized under the condition that the time
delay and bandwidth of the whole
system are hardly influenced.