參數(shù)資料
型號(hào)： pentium II xeon processor
廠商： Intel Corp.
英文描述： pentium II xeon processor at 400 and 450 MHZ(工作頻率400和450兆赫茲奔II處理器)
中文描述： 奔騰II至強(qiáng)處理器400和450兆赫（工作頻率400和450兆赫茲奔二處理器）
文件頁(yè)數(shù)： 47/97頁(yè)
文件大?。?/td> 978K
代理商： PENTIUM II XEON PROCESSOR
E
PENTIUM II XEON PROCESSOR AT 400 AND 450 MHZ
47
12/15/98 5:14 PM 24377002.doc
Reading the thermal sensor is explained in Section
4.3.5. See the Pentium
II Xeon Processor SMBus
Thermal Reference Guidelines for more details and
further recommendations on the use of this feature in
Pentium II Xeon processor-based systems.
The thermal sensor feature in the processor cannot
be used to measure T
PLATE
. The T
PLATE
specification
in Section 5.0. must be met regardless of the reading
of the processor’s thermal sensor in order to ensure
adequate cooling for the entire Pentium II Xeon
processor. The thermal sensor feature is only
available while V
CCCORE
and V
CCSMBus
are at valid
levels and the processor is not in a low-power state.
4.3.5.
THERMAL SENSOR SUPPORTED
SMBUS TRANSACTIONS
The thermal sensor responds to five of the SMBus
packet types: write byte, read byte, send byte,
receive byte, and ARA (Alert Response Address).
The send byte packet is used for sending one-shot
commands only. The receive byte packet accesses
the register commanded by the last read byte packet.
If a receive byte packet was preceded by a write byte
or send byte packet more recently than a read byte
packet, then the behavior is undefined. Table 27
through Table 31 diagram the five packet types. In
these figures, ‘S’ represents the SMBus start bit, ‘P’
represents a stop
bit,
acknowledge, and ‘///’ represents a negative
acknowledge. The shaded bits are transmitted by the
thermal sensor and the bits that aren’t shaded are
transmitted by the SMBus host controller. Table 32
shows the encoding of the command byte.
‘Ack’
represents
an
Table 27. Write Byte SMBus Packet
S
Address
Write
Ack
Command
Ack
Data
Ack
P
1
7 bits
1
1
8 bits
1
8 bits
1
1
Table 28. Read Byte SMBus Packet
S
Address
Write
Ack
Command
Ack
S
Addres
s
Rea
d
Ack
Data
///
P
1
7 bits
1
1
8 bits
1
1
7 bits
1
1
8 bits
1
1
Table 29. Send Byte SMBus Packet
S
Address
Write
Ack
Command
Ack
P
1
7 bits
1
1
8 bits
1
1
Table 30. Receive Byte SMBus Packet
S
Address
Read
Ack
Data
///
P
1
7 bits
1
1
8 bits
1
1
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