RANDOMIZATION OF DIRECTED REFRESH MANAGEMENT (DRFM) PSEUDO TARGET ROW REFRESH (PTRR) COMMANDS
Abstract:
In a memory subsystem, a controller can randomize the sending of directed refresh management (DRFM) commands for DRFM commands that hit multiple banks at a time. The controller can generate commands to indicate the memory device should capture addresses for various banks to use for pseudo target row refresh (pTRR) operations based on addresses associated with activate commands. The controller can randomize the indication of address capture for the memory device. With captured addresses and DRFM commands generated at random, the system can make better use of DRFM commands because the multiple banks are more likely to have addresses for pTRR, and randomization can reduce the ability for a row hammer attack to avoid the DRFM.
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