Datasheet

Processor Uncore Configuration Registers
436 Datasheet, Volume 2
4.2.14.26 WDBWM—WDB Watermarks Register
This register configures the WMM behavior – watermarks and the starvation counter.
Setup rules that must be kept are:
•1 WMM_EXIT < WMM_ENTER - 1
•WMM_ENTER < WPQ_IS
• RPQ_SIZE + 5  WPQ_IS
• WPQ_IS max value is 29
4.2.14.27 WDAR_MODE Register
This is the Write Data Always Response Mode register
Lock by EPMCCTRL_DFX_LCK_CNTL.WDAR_LCK
WDBWM
Bus: 1 Device: 16 Function: 0 Offset: 308h
Bus: 1 Device: 16 Function: 1 Offset: 308h
Bus: 1 Device: 16 Function: 4 Offset: 308h
Bus: 1 Device: 16 Function: 5 Offset: 308h
Bit Attr
Reset
Value
Description
31:16 RW 0020h
STARVE_CNT
This count is used for the starvation switch. If after the WMM transaction count
reaches the value in this field and WDB did not go under WMMExit WM, MC returns
to RMM for the same number of DCLK and returns back to WMM.
15:8 RW 15h
WMM_EXIT
When channel is in WMM, when WDB level gets to this level the MC goes back to
RMM.
The value must be between 1 and (WMM_Enter – 1). Initial value is 22
7:0 RW 19h
WMM_ENTER
When WDB reaches the level defined by this pointer, channel goes into WMM, The
value must be between 2 and (WPQ_IS – 1).
WDAR_MODE
Bus: 1 Device: 16 Function: 0 Offset: 30Ch
Bus: 1 Device: 16 Function: 1 Offset: 30Ch
Bus: 1 Device: 16 Function: 4 Offset: 30Ch
Bus: 1 Device: 16 Function: 5 Offset: 30Ch
Bit Attr
Reset
Value
Description
31:1 RV 0h Reserved
0RW-L 0b
WdarMode
0 = Not enabled
1 =Enabled