Datasheet

Features
112 Dual-Core Intel® Xeon® Processor 7100 Series Datasheet
Notes:
1. Bit 3 of Configuration register 1 must be set to 0 (default value is 0).
2. Writing to RESERVED bits may cause unexpected results. RESERVED bits that must be correctly
programmed are identified in the register definitions in the following section. Reading from RESERVED bits
will return unknown values.
3. The 4 least significant bits of the thermal sensor die revision code may change and should not be used for
identification.
All of the commands in Tab le 7 - 1 3 are for reading or writing registers in the SMBus
thermal sensor, except the one-shot register (0Fh). The one-shot command forces the
immediate start of a new conversion cycle. If a conversion is in progress when the one-
shot command is received, then the command is ignored. If the thermal sensor is in
stand-by mode when the one-shot command is received, a conversion is performed
and the sensor returns to stand-by mode. The one-shot command is not supported
when the thermal sensor is in auto-convert mode.
Note: Writing to a read-command register or reading from a write-command register will
produce invalid results.
Table 7-13. SMBus Thermal Sensor Command Byte Bit Assignments
Register Command R/W Lock
4
Reset State
RESERVED
2
00h N/A N/A RESERVED
Ch. 1 Temp. Value
1
01h R N 0000 0000
Status Register 1 02h R N Undefined
Configuration Register 1 03h R Y 0000 0000
Conversion Rate Register 04h R Y 0000 0111
RESERVED
2
05h - 06h N/A N/A RESERVED
Ch. 1 Temp. High Limit
1,4
07h R Y 0101 0101
Ch. 1 Temp. Low Limit
1,4
08h R Y 0000 0000
Configuration Register 09h W Y 0000 0000
Conversion Rate Register 0Ah W Y 0000 0111
RESERVED
2
0Bh - 0Ch N/A N/A RESERVED
Ch. 1 Temp. High Limit
1,4
0Dh W Y 0101 0101
Ch. 1 Temp. Low Limit
1,4
0Eh W Y 0000 0000
One-shot 0Fh W N/A N/A
RESERVED
2
10h N/A N/A RESERVED
Ch. 1 Temp. Offset
1
11h R/W Y 0000 0000
RESERVED
2
12h - 22h N/A N/A RESERVED
Status Register 2 23h R N 0000 0000
RESERVED
2
24h - 29h N/A N/A RESERVED
Ch. 2 Temp. Value 30h R N 0000 0000
Ch. 2 Temp. High Limit
4
31h R/W Y 0101 0101
Ch. 2 Temp. Low Limit
4
32h R/W Y 0000 0000
RESERVED
2
33h R N/A 0000 0000
Ch. 2 Temp. Offset 34h R/W Y 0000 0000
RESERVED
2
35h - FDh N/A N/A RESERVED
Manufacturer ID FEh R N/A 0100 0001
Die Revision Code
3
FFh R N/A 1001xxxx