ICS9220 Datasheet, PDF (3/17 Pages) Integrated Device Technology – Programmable RambusTM XDRTM Clock Generator

ICS9220
General SMBus serial interface information for the ICS9220
How to Write:
• Controller (host) sends a start bit.
• Controller (host) sends the write address per table 3
• ICS clock will acknowledge
• Controller (host) sends the begining byte location = N
• ICS clock will acknowledge
• Controller (host) sends the data byte count = X
• ICS clock will acknowledge
• Controller (host) starts sending Byte N through
Byte N + X -1
• ICS 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 per table 3
• ICS clock will acknowledge
• Controller (host) sends the begining byte
location = N
• ICS clock will acknowledge
• Controller (host) will send a separate start bit.
• Controller (host) sends the read address per table 3
• ICS clock will acknowledge
• ICS clock will send the data byte count = X
• ICS clock sends Byte N + X -1
• ICS clock sends Byte 0 through byte X
• Controller (host) will need to acknowledge each byte
• Controllor (host) will send a not acknowledge bit
• Controller (host) will send a stop bit
Index Block Write Operation
Controlle r (Host)
ICS (Sla ve/Re ce ive r)
T
starT bit
Slave Address table 3
WR
W Rite
Beginning Byte = N
Data Byte Count = X
Beginning Byte N
ACK
ACK
ACK
ACK
Byte N + X - 1
P
stoP bit
ACK
Index Block Read Operation
Controlle r (Host)
ICS (Sla ve/Re ce ive r)
T
starT bit
Slave Address table 3
WR
W Rite
Beginning Byte = N
RT
Repeat starT
ACK
ACK
Slave Address table 3
RD
ReaD
ACK
ACK
ACK
Data Byte Count = X
Beginning Byte N
N
Not acknowledge
P
stoP bit
Byte N + X - 1
1227G—11/05/07
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