IDT 89HPES34H16, User Manual, Page: 76 / 182

IDT SMBus Interfaces
PES34H16 User Manual 6 - 18 October 30, 2008
Notes
SMBus Transactions
The slave SMBus interface responds to the following SMBus transactions initiated by an SMBus master.
See the SMBus 2.0 specification for a detailed description of these transactions.
– Byte and Word Write/Read
– Block Write/Read
Initiation of any SMBus transaction other than those listed above to the slave SMBus interface produces
undefined results.
Associated with each of the above transactions is a command code. The command code format for
operations supported by the slave SMBus interface is shown in Figure 6.7 and described in Table 6.15.
Figure 6.7 Slave SMBus Command Code Format
4 0
5 SSMBADDR[5]
6 1
7 1
Bit
Field
Name
Description
0 END End of transaction indicator. Setting both START and END signifies a
single transaction sequence
0 - Current transaction is not the last read or write sequence.
1 - Current transaction is the last read or write sequence.
1 START Start of transaction indicator. Setting both START and END signifies
a single transaction sequence
0 - Current transaction is not the first of a read or write sequence.
1 - Current transaction is the first of a read or write sequence.
Table 6.15 Slave SMBus Command Code Fields (Part 1 of 2)
Address
Bit
Address Bit Value
Table 6.14 Slave SMBus Address When a Static Address is Selected (Part 2 of 2)
Bit
6
Bit
7
Bit
0
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
END START FUNCTION SIZE PEC