參數(shù)資料
型號： AMDOPTERON
英文描述： AMD Opteron - AMD Opteron Processor Data Sheet
中文描述： AMD Opteron處理器- AMD Opteron處理器的數(shù)據(jù)資料
文件頁數(shù)： 23/81頁
文件大?。?/td> 1189K
代理商： AMDOPTERON
Chapter 3
Power Management
23
23932 Rev 3.00 April 2003
AMD Opteron
Processor Data Sheet
current paths between power planes.
Tristates all DDR SDRAM I/O pins except for the MEMCKE_LO/UP and MEMRESET_L out-
puts, which are driven Low.
Drives its VID[4:0] outputs to the value that selects the startup core voltage level.
3.4
RESET_L and MEMRESET_L
When RESET_L is asserted, the processor performs the following steps:
The processor core is held in a low-power state.
The MEMCKE_LO/UP and MEMRESET_L outputs are forced low.
After RESET_L is deasserted, BIOS must program the appropriate clock divisor in the memory con-
troller configuration registers, causing the MEMCLK_LO_H/L[3:0] and MEMCLK_UP_H/L[3:0]
clocks to be driven. When the Dram_Init bit is set (DRAM Config Low register), the MEMRESET_L
pin is deasserted after a minimum of 394
μ
s at166 MHz (DDR333) or a maximum of 655
μ
s at100
MHz (DDR200). This period is required to allow ample time for PLLs to ramp in registered DDR
SDRAM DIMMs. After 12 memory clock periods, the memory controller drives the MEMCKE_LO/
UP outputs High and the DRAM initialization sequence is performed. Refer to the
BIOS and Kernel
Developer
’
s Guide for the AMD Athlon
64 and AMD Opteron
Processors
,
order# 26094, for
details on the memory controller configuration registers.
3.5
Thermal Diode
The processor provides an on-die thermal diode with anode and cathode brought out to processor
pins. This diode can be read by an external temperature sensor to determine the processor
’
s
temperature. Refer to the
AMD Opteron
Processor Motherboard Design Guide
, order# 25180, for
details on connecting the thermal diode.
3.6
THERMTRIP_L
The AMD Opteron processor provides a hardware-enforced thermal protection mechanism. When the
processor
’
s die temperature exceeds a specified temperature, the processor is designed to protect
itself from over-temperature conditions by stopping its internal clocks and asserting the
THERMTRIP_L output.
THERMTRIP_L assertion is only valid when PWROK is asserted and RESET_L is deasserted.
If the processor
’
s die temperature still exceeds the thermal trip point when RESET_L is deasserted,
THERMTRIP_L will immediately be reasserted and the processor
’
s internal clocks will be stopped.
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