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Register Description
D15343-003 83
4.9.15 PWRMG – DRAM Controller Power Management Control Register
(Device #0)
Address Offset:
Default Value:
Access:
Size:
68-6Bh
00000000h
Read/Write
32 bits
Bit Description
31:24 Reserved
23:20 Row State Control: This field determines the number of clocks the System Memory Controller
will remain in the idle state before it begins pre-charging all pages or powering down rows.
- PDEn: Power Down Enable
- PCEn: Page Close Enable
- TC: Timer Control
PDEn(23)
: PCEn(22): TC(21:20) Function
0 0 XX All Disabled
0 1 XX Reserved
1 0 XX Reserved
1 1 00 Immediate Precharge and Powerdown
1 1 01 Reserved
1 1 10 Precharge and Power Down after 16 DDR
SDRAM Clocks
1 1 11 Precharge and Power Down after 64 DDR
SDRAM Clocks
19:16 Reserved
15 Self Refresh GMCH Memory Interface Data Bus Power Management Optimization Enable:
0 = Enable
1 = Disable
14 CS# Signal Drive Control:
0 = Enable CS# Drive Control, based on rules described in DRC bit 12.
1 = Disable CS# Drive Control, based on rules described in DRC bit 12.
13 Self Refresh GMCH Memory Interface Data Bus Power Management:
0 = In Self Refresh Mode GMCH Power Management is Enabled.
1 = In Self Refresh Mode the GMCH Power Management is Disabled.
12 Dynamic Memory Interface Power Management:
0 = Dynamic Memory Interface Power Management Enabled.
1 = Dynamic Memory Interface Power Management Disabled.
11 Rcven DLL shutdown disable:
0 = Normal operation. RCVEN DLL is turned off when the corresponding SO-DIMM is
unpopulated.
1 = RCVEN DLL is turned on irrespective of SO-DIMM population.