time s 130 no the method returns to step s 120 otherwise s 130 yes a command cmd has not been generated within the setup time so mla 100 is switched into the sleep mode s 140 in general the sleep mode can be initiated automatically through step s 140 or in response to a sleep command from host cpu 400 during the sleep mode memory controller 300 is placed in a sleeping state which can be referred to alternatively as placing memory controller 300 in a sleep mode next mla 100 determines whether host cpu 400 has generated an interrupt signal or a wake up signal s 150 where such a signal is detected s 150 yes mla 100 is released from the sleep mode and placed in an active mode s 160 accordingly memory controller 300 is woken up which can be referred to alternatively as releasing memory controller 300 from the sleep mode otherwise s 150 no the method returns to step s 140 fig4 is a flowchart illustrating a memory management control procedure of an mla according to an embodiment of the inventive concept fig5 a is a block diagram illustrating a storage mode initiated by the memory management control procedure according to an embodiment of the inventive concept fig5 b is a block diagram illustrating a standby mode initiated by the memory management control procedure according to an embodiment of the inventive concept for convenience the method of fig4 will be explained with reference to mla 100.