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236 AMD Geode™ LX Processors Data Book
GeodeLink™ Memory Controller Register Descriptions
33234H
6.2.2.17 PM Sensitivity Counters (MC_CF_PMCTR)
MSR Address 20000020h
Typ e R /W
Reset Value 00000000_00000006h
MC_CF_PMCTR Register Map
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
PM1_SENS
313029282726252423222120191817161514131211109876543210
PM0_SENS
MC_CF_PMCTR Bit Descriptions
Bit Name Description
63:32 PM1_SENS PMode1 Sensitivity Counter. Counter that controls the GLMC’s sensitivity to entering
PMode1 power down mode. If PMode1 is enabled, PM1_SENS starts counting down
from its loaded value whenever the GLMC becomes idle. If it times out and the GLMC is
still idle, the GLMC goes into PMode1. If, however, the GLMC resumes activity before
time-out, the counter is reset to its loaded value and PMode1 is not entered. (Default =
0h)
31:0 PM0_SENS PMode0 Sensitivity Counter. Counter that controls the GLMC’s sensitivity to entering
PMode0 power down mode. If PMode0 is enabled, PM0_SENS starts counting down
from its loaded value whenever the GLMC becomes idle. If it times out and the GLMC is
still idle, the GLMC goes into PMode0. If, however, the GLMC resumes activity before
time-out, the counter is reset to its loaded value and PMode0 is not entered. (Default =
6h, to allow 32-bit bursts to finish).