Intel Itanium 9140M NE80567KF028009 Manuale Utente

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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. 

 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. 

 shows the encoding of the command byte.

1

7  bits

1

1

8  bits

1

8  bits

1

1

1

7  bits

0

1

8  bits

1

1

7  bits

1

1

8 bits

1

1

1

7  bits

1

1

8  bits

1

1

7  bits

1

1

8 bits

1

1

1

0001 100

1

1

1001 1011

1

1