IDT
®
Programmable Timing Control Hub for Intel Based Systems 1602F—11/04/11
ICS9LRS3187B
Programmable Timing Control Hub for Intel Based Systems
6
Datasheet
General SMBus serial interface information for the ICS9LRS3187B
How to Write:
• Controller (host) sends a start bit.
• Controller (host) sends the write address D2
(H)
• IDT clock will
acknowledge
• Controller (host) sends the beginning byte location = N
• IDT clock will
acknowledge
• Controller (host) sends the data byte count = X
• IDT clock will
acknowledge
• Controller (host) starts sending
Byte N through
Byte N + X -1
• IDT clock will
acknowledge
each byte
one at a time
• Controller (host) sends a Stop bit
How to Read:
• Controller (host) will send start bit.
• Controller (host) sends the write address D2
(H)
• IDT clock will
acknowledge
• Controller (host) sends the begining byte
location = N
• IDT clock will
acknowledge
• Controller (host) will send a separate start bit.
• Controller (host) sends the read address D3
(H)
• IDT clock will
acknowledge
• IDT clock will send the data byte count = X
• IDT clock sends
Byte N + X -1
• IDT clock sends
Byte 0 through byte X (if X
(H)
was written to byte 8)
.
• Controller (host) will need to acknowledge each byte
• Controller (host) will send a not acknowledge bit
• Controller (host) will send a stop bit
IDT (Slave/Receiver)
T
WR
ACK
ACK
ACK
ACK
ACK
P
Byte N + X - 1
Data Byte Count = X
Beginning Byte N
stoP bit
X Byte
Index Block Write Operation
Slave Address D2
(H)
Beginning Byte = N
WRite
starT bit
Controller (Host)
T starT bit
WR WRite
RT Repeat starT
RD ReaD
Beginning Byte N
Byte N + X - 1
N Not acknowledge
PstoP bit
IDT (Slave/Receiver)
Controller (Host)
X Byte
ACK
ACK
Data Byte Count = X
ACK
Slave Address D3
(H)
Index Block Read Operation
Slave Address D2
(H)
Beginning Byte = N
ACK
ACK
