Specification Sheet

Datasheet, Volume 2 of 2 195
MCHBAR Registers
7.24 Refresh parameters (TC)—Offset 4E38h
Refresh parameters
Access Method
Default: 4600980Fh
Type: MEM
(Size: 32 bits)
Offset: [B:0, D:0, F:0] + 4E38h
3
1
2
8
2
4
2
0
1
6
1
2
8 4 0
0 1 0 0 0 1 1 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 1 1 1 1
tREFIx9
RSVD
Refresh_panic_wm
Refresh_HP_WM
OREF_RI
Bit
Range
Default &
Access
Field Name (ID): Description
31:25
23h
RW_L
tREFIx9: Maximum time allowed between refreshes to a rank (in intervals of 1024
DCLK cycles). Should be programmed to 8.9*tREFI/1024 (to allow for possible delays
from ZQ or isoc).
24:16
0h
RO
Reserved (RSVD): Reserved.
15:12
9h
RW_L
Refresh_panic_wm: tREFI count level in which the refresh priority is panic
(default is 9). The Maximum value for this field is 9.
11:8
8h
RW_L
Refresh_HP_WM: tREFI count level that turns the refresh priority to high (default is
8)
7:0
Fh
RW_L
OREF_RI: Rank idle period that defines an opportunity for refresh, in DCLK cycles