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參數(shù)資料
| 型號： | ASC7621QS24 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | HARDWARE MONITOR WITH INTEGRATED FAN CONTROL |
| 中文描述： | 五金顯示器整合了風(fēng)扇控制 |
| 文件頁數(shù)： | 11/50頁 |
| 文件大?。?/td> | 565K |
| 代理商： | ASC7621QS24 |
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Andigilog, Inc. 2006
www.andigilog.com
October 2006 - 70A06010
aSC7621
PECI
The aSC7621 is compatible with devices that are
compliant with Intel’s PECI 1.0 specifications. More
information on this interface may be found in their PECI
interface specifications.
Temperatures sent over the PECI interface from the CPU
are in Celsius degrees relative to the Thermal Control
Circuit (TCC) temperature stored internally in the CPU
and accessed only through BIOS. This is the temperature
limit where internal measures are taken to reduce power
dissipation. Fan speed control settings sent by the BIOS
over the SMBus to registers in the aSC7621 are made
using this relative temperature rather than the absolute
readings of remote or on-chip diodes.
As many as four CPU clients on the PECI bus are
addressed in the range of 0x30 to 0x33. Currently, each
address is a single-packaged device that may have up to
two domains or CPU-measured digital temperatures.
General Operation
The PECI host in aSC7621 performs the following
functions:
Responds to SMBus configuration identifying the
presence of PECI clients and the Thermal Zone
associated with each client.
Reads the PECI temperature of the domain(s) of
each client processor addressed.
Stores the highest result from each PECI
address
into
Temperature
associated to the measurement received from
the client. (each address may be associated with
any one Temperature Zone.)
Flags an error if no valid PECI temperature can
be read.
Continuously monitors the state of the PECI
interface for fault conditions.
PECI Temperature Format and Range
The PECI temperatures read from the processor will be in
the range 0
°
C to -127
°
C where 0
°
C is the hottest
temperature and has the following format:
2’s Complement
Representation
0° C
0000 0000 00.00 0000
-1° C
1111 1111 11.00 0000
-5° C
1111 1110 11.00 0000
-32° C
1111 1000 00.00 0000
-127° C
1111 0000 01.00 0000
Zone
register
Temperature
Table 1 Raw PECI Temperature Format
These readings are not accessible to the user but are
filtered, re-formatted and assigned to a Temperature
Zone. Filtered PECI Temperature readings are accessible
by the user before they are assigned to a Temperature
Zone by reading registers F6h through FDh. These
readings follow the format described in Table 2. The
PECI temperatures assigned to a Temperature Zone are
reported over SMBus interface in Temperature Zone
registers also will be in the range 0
°
C to -127
°
C. The
format reported through Temperature Zone registers is
re-aligned to agree with diode measurements. It is stored
in two register locations in the following format with
integer high byte and fractional low byte to be consistent
with all other temperature reports:
2’s Complement
Representation
Temperature
High Byte
0° C
0000 0000
-1° C
1111 1111
-5° C
1111 1011
-32° C
1110 0000
-127° C
1000 0001
Low Byte
.0000 0000
.0000 0000
.0000 0000
.0000 0000
.0000 0000
Table 2 PECI Temperature Report Format
PECI Errors
A specific set of temperature reading value encodings,
well outside the operational range of 0
°
C to -127
°
C, are
reserved to signal temperature sensor faults on the CPU
to aSC7621 interface. These encodings are in the PECI
temperature format as delivered by the CPU and are
converted to the appropriate Interrupt Status Register 3
error bits described in the Interrupt Status register section
below.
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