Dual-Core Intel
®
Itanium
®
Processor 9000 and 9100 Series Datasheet
87
System Management Feature Specifications
6.6
Thermal Sensing Device Supported SMBus
Transactions
The thermal sensing device responds to five of the SMBus packet types: write byte,
read byte, send byte, receive byte, and alert response address (ARA). 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 6-8
through
Table 6-12
diagram the five packet
types. In these tables, ‘S’ represents the SMBus start bit, ‘P’ represents a stop bit, ‘Ack’
represents an acknowledge, and ‘///’ represents a negative acknowledge. The shaded
bits are transmitted by the thermal sensor and the unshaded bits are transmitted by
the SMBus host controller.
Table 6-13
shows the encoding of the command byte.
Table 6-8.
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 6-9.
Read Byte SMBus Packet
S
Address
Write
Ack
Command
Ack
S
Address
Read
Ack
Data
//
/
P
1
7 bits
0
1
8 bits
1
1
7 bits
1
1
8 bits
1
1
Table 6-10. Send Byte SMBus Packet
S
Address
Write
Ack
Command
Ack
P
1
7 bits
1
1
8 bits
1
Table 6-11. Receive Byte SMBus Packet
S
Address
Read
Ack
Data
///
P
1
7 bits
1
1
8 bits
1
1
Table 6-12. ARA SMBus Packet
S
ARA
Read
Ack
Address
///
P
1
0001 100
1
1
1001 1011
1
1
Summary of Contents for Itanium 9010
Page 14: ...14 Dual Core Intel Itanium Processor 9000 and 9100 Series Datasheet Introduction ...
Page 78: ...78 Dual Core Intel Itanium Processor 9000 and 9100 Series Datasheet Thermal Specifications ...
Page 108: ...108 Dual Core Intel Itanium Processor 9000 and 9100 Series Datasheet Signals Reference ...