Intel G640T CM8062301002204 User Manual

212

Datasheet, Volume 2

31:18

RO

0h

17:16

RW-L

00b

Uncore

Double Refresh Control (DOUBLE_REFRESH_CONTROL)
This field will allow the double self refresh enable/disable.
00b = Double refresh rate when DRAM is WARM/HOT.
01b = Force double self refresh regardless of temperature.
10b = Disable double self refresh regardless of temperature.
11b = Reserved

15:12

RW-L

9h

Uncore

Refresh panic WM (Refresh_panic_wm)
tREFI count level in which the refresh priority is panic (default is 9)
It is recommended to set the panic WM at least to 9, in order to 

use the maximum no-refresh period possible. 

11:8

RW-L

8h

Uncore

Refresh high priority WM (Refresh_HP_WM)
tREFI count level that turns the refresh priority to high (default is 

8).

7:0

RW-L

0Fh

Uncore

Rank idle timer for opportunistic refresh (OREF_RI)
Rank idle period that defines an opportunity for refresh, in DCLK 

cycles.

31:25

RW-L

23h

Uncore

9 * tREFI (tREFIx9)
Period of minimum between 9*tREFI and tRAS maximum (normally 

70 us) in 1024 * DCLK cycles (default is 35) – need to reduce 

100 DCLK cycles – uncertainty on timing of panic refresh.

24:16

RW-L

0B4h

Uncore

Refresh execution time (tRFC)
Time of refresh from beginning of refresh until next ACT or refresh 

is allowed (in DCLK cycles, default is 180).

15:0

RW-L

1004h

Uncore

tREFI period in DCLK cycles (tREFI)
This field defines the average period between refreshes, and the 

rate that tREFI counter is incremented (in DCLK cycles, default is 

4100).