Intel Xeon E5502 80602E5502 User Manual

Product codes
80602E5502
Page of 130
Register Description
120
Intel® Xeon® Processor 5500 Series Datasheet, Volume 2
2.18.5
MC_THERMAL_PARAMS_B0
MC_THERMAL_PARAMS_B1
MC_THERMAL_PARAMS_B2
Parameters used by the thermal throttling logic.
2.18.6
MC_COOLING_COEF0
MC_COOLING_COEF1
MC_COOLING_COEF2
Heat removed from DRAM 8 DCLKs. This should be scaled relative to the per command 
weights and the initial value of the throttling threshold. This includes idle command and 
refresh energies. If 2X refresh is supported, the worst case of 2X refresh must be 
assumed.
When there are more than 4 ranks attached to the channel, the thermal throttle logic is 
shared. 
Device:
4, 5, 6
Function: 3
Offset:
64h
Access as a Dword
Bit
Type
Reset
Value
Description
31:26
RW
1
SAFE_INTERVAL. Safe values for cooling coefficient and duty cycle will be 
applied while the SAFE_INTERVAL is exceeded. This interval is the number of 
ZQ intervals since the last time the MC_COOLING_COEF or MC_CLOSED_LOOP 
registers have been written. A register to write to MC_COOLING_COEF or 
MC_CLOSED_LOOP will re-apply the normal MC_COOLING_COEF and 
MC_CLOSED_LOOP.MIN_THROTTLE_DUTY_CYC values. The register value 
written need not be different; writing the current value will suffice. The 
MC_THERMAL_STATUS.CYCLES_THROTTLED field is reloaded when the number 
of ZQ intervals exceeds this value. This field must not be programmed to 0; this 
value is illegal.
25:16
RW
255
SAFE_DUTY_CYC. This value replaces 
MC_CLOSED_LOOP.MIN_THROTTLE_DUTY_CYC while the 
MC_THERMAL_PARAMS_B.SAFE_INTERVAL is exceeded.
15:8
RW
1
SAFE_COOL_COEF. This value replaces MC_COOLING_COEF while the 
THERMAL_PARAMS_B.SAFE_INTERVAL is exceeded.
7:0
RW
0
ACTCMD_ENERGY. Energy of an Activate/Precharge Cycle.
Device:
4, 5, 6
Function: 3
Offset:
80h
Access as a Dword
Bit
Type
Reset
Value
Description
31:24
RW
255
RANK3. Rank 3 Cooling Coefficient.
23:16
RW
255
RANK2. Rank 2 Cooling Coefficient.
15:8
RW
255
RANK1. Rank 1 Cooling Coefficient.
7:0
RW
255
RANK0. Rank 0 Cooling Coefficient.