Memory Controller Mmio Registers Broadcast Group; Pm_Pdwn_Config-Power-Down Configuration Register; Memory Controller Mmio Registers Broadcast Group Register Address Map - Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - DATASHEET VOLUME 2 01-2011 Datasheet

Processor Configuration Registers
2.17 Memory Controller MMIO Registers Broadcast
Group
Table 2-19
the sections following the table.
Table 2-19. Memory Controller MMIO Registers Broadcast Group Register Address Map
Address
Offset
0–4CAFh
4CB0-4CB3h
4CB4–4CC7h
4CD0–4F83h
4F84–4F87h
4F88–4F8Bh
4F8C–4F8Fh
2.17.1 PM_PDWN_Config—Power-down Configuration Register
This register defines the power-down (CKE-off) operation – power-down mode, idle
timer, and global / per rank decision.
B/D/F/Type:
Address Offset:
Default Value:
Access:
Size:
BIOS Optimal Default:
Bit
31:13
12
11:8
7:0
Datasheet, Volume 2
lists the registers arranged by address offset. Register bit descriptions are in
Register Symbol
RSVD Reserved
PM_PDWN_config Power-down Configuration
RSVD Reserved
RSVD Reserved
PM_CMD_PWR Power Management Command Power
PM_BW_LIMIT_config BW Limit Configuration
RSVD Reserved
0/0/0/MCHBAR_MCBCAST
4CB0-4CB3h
00000000h
RW-L
32 bits
00000h
Reset RST/
Attr
Value PWR
RO 0h
RW-L 0b Uncore
RW-L 0h Uncore
RW-L 00h Uncore
Register Name
Description
Reserved
Global power-down (GLPDN)
1 = Power-down decision is global for channel.
0 = A separate decision is taken for each rank.
Power-down mode (PDWN_mode)
Selects the mode of power-down. All encodings not in table are
reserved.
Note: When selecting DLL-off or APD-DLL off, DIMM MR0 register
bit 12 (PPD) must equal 0.
Note: When selecting APD, PPD or APD-PPD, DIMM MR0 register
bit 12 (PPD) must equal 1.
The value 0h (no power-down) is a don't care.
0h = No Power Down
1h = APD
2h = PPD
3h = APD - PPD
6h = DLL Off
7h = APD - DLL Off
Power-down idle timer (PDWN_idle_counter)
This defines the rank idle period in DCLK cycles that causes power-
down entrance.
Reset
Access
Value
— —
00000000h RW-L
— —
— —
00000000h RW-LV
FFFF03FFh RW-L
FF1D1519h RW-L
213