RG82845 S L5YQ Intel, RG82845 S L5YQ Datasheet - Page 94

• Manufacturer Part Number: RG82845 S L5YQ
• Manufacturer: Intel

Specifications of RG82845 S L5YQ

• Lead Free Status / RoHS Status: Not Compliant

Register Description
3.6.23
94
DWTC—DRAM Write Thermal Management Control
Register (Device 1)
Address Offset:
Default Value:
Access:
Size:
63:41
40:28
27:22
21:15
14:3
2:1
Bit
0
0
Reserved.
Global Write Hexword Threshold (GWHT). The 13-bit value in this field is multiplied by 2
arrive at the number of hexwords that must be written within the Global DRAM Write Sampling
Window to cause the thermal management mechanism to be invoked.
Write Thermal Management Time (WTMT). This value provides a multiplier between 0 and 63
that specifies how long thermal management remains in effect as a number of Global DRAM
Write Sampling Windows. For example, if GDWSW is programmed to
1000_0000b and WTT is set to 01_0000b, then thermal management will be performed for
8192*10
Write Thermal Management Monitoring Window (WTMMW). The value in this register is
padded with four 0s to specify a window of 0–2047 host clocks with a 16-clock granularity.
While the thermal management mechanism is invoked, system memory writes are monitored
during this window. If the number of hexwords written during the window reaches the Write
Thermal Management Hexword Maximum (bits 14:3), then write requests are blocked for the
remainder of the window.
Write Thermal Management Hexword Maximum (WTMHM). The Write Thermal
Management Hexword Maximum defines the maximum number of hexwords between 0–4095
that are permitted to be written to system memory within one Write Thermal Management
Monitoring Window.
Write Thermal Management Mode (WTMMode).
00 = Thermal management via Counters and Hardware Thermal Management_on signal
01 = Hardware Thermal Management_on signal mechanism is enabled. In this mode, as long
10 = Counter mechanism controlled through GDWSW and GWHT is enabled. When the
11 = Reserved.
START Write Thermal Management (SWTM). Software writes to this bit to start and stop write
thermal management.
0 = Write thermal management stops and the counters associated with WTMW and WTHM are
1 = Write thermal management begins based on the settings in WTMW and WTHM, and
Reserved.
reset.
remains in effect until this bit is reset to 0.
mechanisms disabled.
as the Thermal Management_on signal is asserted, write thermal management is in effect
based on the settings in WTMW and WTHM. When the Thermal Management_on signal is
deasserted, write thermal management stops and the counters associated with the
WTMW and WTHM are reset. When the hardware Thermal Management_on signal
mechanism is not enabled, the Thermal Management_on signal has no effects.
threshold set in GDWSW and GWHT is reached, thermal management start/stop cycles
occur based on the settings in WTT, WTMW and WTHM.
5
host clocks (@ 100 MHz) seconds once invoked (128 * 4*10
50–57h
00h
R/W/L
64 bits
Descriptions
Intel
®
82845 MCH for SDR Datasheet
5
host clocks * 16).
15
to
R