Si1000/1/2/3/4/5
Table 24.6. SMBus Status Decoding With Hardware ACK Generation Enabled (EHACK = 1)
(Continued)
Values Read
Current SMbus State
Typical Response Options
Valuesto
Write
0100
0
0
0
0
0
0
1
X
0
1
X
X
A slave byte was transmitted; No action required (expecting
NACK received. STOP condition).
A slave byte was transmitted; Load SMB0DAT with next data
ACK received. byte to transmit.
A Slave byte was transmitted; No action required (expecting
error detected. Master to end transfer).
0
0
0
0
0
0
0
0
X
X
X
X
0001
0100
0001
-
0101
0010
An illegal STOP or bus error Clear STO.
was detected while a Slave
Transmission was in progress.
0
0
0
1
X
X
A slave address + R/W was
received; ACK sent.
If Write, Set ACK for first data
byte.
0
0
0
0
0
0
0
0
1
X
1
X
0000
0100
0000
0100
If Read, Load SMB0DAT with
data byte
Lost arbitration as master;
If Write, Set ACK for first data
slave address + R/W received; byte.
ACK sent.
If Read, Load SMB0DAT with
data byte
Reschedule failed transfer
Clear STO.
1
0
0
0
X
X
1110
-
0001
0000
0
0
X
A STOP was detected while
addressed as a Slave Trans-
mitter or Slave Receiver.
0
0
1
0
X
X
Lost arbitration while attempt- No action required (transfer
0
0
0
0
0
0
0
1
0
-
ing a STOP.
complete/aborted).
A slave byte was received.
Set ACK for next data byte;
Read SMB0DAT.
0000
0000
Set NACK for next data byte;
Read SMB0DAT.
0010
0001
0000
0
0
0
1
1
1
X
X
X
Lost arbitration while attempt- Abort failed transfer.
0
1
0
1
0
1
0
0
0
0
0
0
X
X
X
X
X
X
-
ing a repeated START.
Reschedule failed transfer.
1110
-
Lost arbitration due to a
detected STOP.
Abort failed transfer.
Reschedule failed transfer.
1110
-
Lost arbitration while transmit- Abort failed transfer.
ting a data byte as master.
Reschedule failed transfer.
1110
Rev. 1.0
309
SILICON [ SILICON ]
