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The C5500/C3500 products also have asynchronous DRAM self-refresh, which helps save DRAM contents if there is a power failure, and non-transparent bridging (NTB).
To avoid this loss, most DRAMs support a mode called self-refresh wherein the DRAM itself takes care of refreshing its cells.
DRAM, however, is put in its self-refresh mode to preserve the machine state (system and application text / data loaded in memory) while the system is sleeping.
In such cases, software can put DRAM in its self-refresh mode by writing to a few control registers before transitioning the CPU to its sleep mode, thereby preserving the DRAM contents.