Si1000/1/2/3/4/5
Table 24.3. Sources for Hardware Changes to SMB0CN
Bit
Set by Hardware When:
Cleared by Hardware When:
MASTER
A START is generated.
A STOP is generated.
Arbitration is lost.
A START is detected.
Arbitration is lost.
TXMODE
START is generated.
SMB0DAT is written before the start of an
SMBus frame.
SMB0DAT is not written before the
start of an SMBus frame.
STA
STO
A START followed by an address byte is
received.
A STOP is detected while addressed as a
slave.
Must be cleared by software.
A pending STOP is generated.
Arbitration is lost due to a detected STOP.
A byte has been received and an ACK
response value is needed (only when
hardware ACK is not enabled).
A repeated START is detected as a
MASTER when STA is low (unwanted
repeated START).
ACKRQ
After each ACK cycle.
Each time SI is cleared.
ARBLOST
SCL is sensed low while attempting to
generate a STOP or repeated START
condition.
SDA is sensed low while transmitting a 1
(excluding ACK bits).
The incoming ACK value is low
(ACKNOWLEDGE).
ACK
SI
The incoming ACK value is high
(NOT ACKNOWLEDGE).
Must be cleared by software.
A START has been generated.
Lost arbitration.
A byte has been transmitted and an
ACK/NACK received.
A byte has been received.
A START or repeated START followed by a
slave address + R/W has been received.
A STOP has been received.
296
Rev. 1.0
SILICON [ SILICON ]
