Thermal/Mechanical Specifications and Design Guide
67
PECI Interface
7.1.2.6.8
DRAM Power Info Read
This read returns the minimum, typical and maximum DRAM power settings and the
maximum time window over which the power can be sustained for the entire DRAM
domain and is inclusive of all the DIMMs within all the memory channels. Any power
values specified by the power limiting entity that is outside of the range specified
through these settings cannot be guaranteed. Since this data is 64 bits wide, PECI
facilitates access to this register by allowing two requests to read the lower 32 bits and
upper 32 bits separately as shown in
. Power and time units for this read are
defined as per the Package Power SKU Unit settings described in
7.1.2.6.9
DRAM Power Limit Data Write / Read
This feature allows the PECI host to program the power limit over a specified time or
control window for the entire DRAM domain covering all the DIMMs within all the
memory channels. Actual values are chosen based on DRAM power consumption
characteristics. The units for the DRAM Power Limit and Control Time Window are
determined as per the Package Power SKU Unit settings described in
.
The DRAM Power Limit Enable bit in
should be set to activate this feature.
7.1.2.6.10
DRAM Power Limit Performance Status Read
This service allows the PECI host to assess the performance impact of the currently
active DRAM power limiting modes. The read return data contains the sum of all the
time durations for which each of the DIMMs has been operating in a low power state.
This information is tracked by a 32-bit counter that wraps around. The unit for time is
determined as per the Package Power SKU Unit settings described in
.
Figure 7-16. DRAM Power Info Read Data
DRAM_POWER_INFO (lower bits)
Reserved
14
Minimum DRAM Power
16
TDP DRAM Power
(Typical Value)
30
0
15
Reserved
31
DRAM_POWER_INFO (upper bits)
Maximum DRAM Power
32
46
Reserved
47
Maximum Time
Window
48
54
Reserved
55
63
Figure 7-17. DRAM Power Limit Data
DRAM _POW ER_LIM IT Data
DRAM
Pow er Lim it
Enable
15
23
DRAM Power Lim it
14
0
RESERVED
16
Control Tim e
W indow
17
31
RESERVED
24
Summary of Contents for BX80619I73820
Page 10: ...10 Thermal Mechanical Specifications and Design Guide...
Page 14: ...Introduction 14 Thermal Mechanical Specifications and Design Guide...
Page 104: ...Thermal Solutions 104 Thermal Mechanical Specifications and Design Guide...
Page 112: ...Mechanical Drawings 112 Thermal Mechanical Specifications and Design Guide...
Page 118: ...Socket Mechanical Drawings 118 Thermal Mechanical Specifications and Design Guide...
Page 124: ...Package Mechanical Drawings 124 Thermal Mechanical Specifications and Design Guide...
