9DB1200C IDT [Integrated Device Technology], 9DB1200C Datasheet - Page 10

• Manufacturer Part Number: 9DB1200C
• Description: Twelve Output Differential Buffer for PCIe Gen1/Gen2, QPI, and FBDIMM
• Manufacturer: IDT [Integrated Device Technology]

How to Write:
• Controller (host) sends a start bit.
• Controller (host) sends the write address DC
• 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
• ICS clock will acknowledge each byte one at a time
• Controller (host) sends a Stop bit
Note: Addresses show assumes pin 29 is low.
IDT
9DB1200C
Twelve Output Differential Buffer for PCIe Gen1/Gen2, QPI, and FBDIMM
Byte N + X -1
®
Twelve Output Differential Buffer for PCIe Gen1/Gen2, QPI, and FBDIMM
WR
P
T
Beginning Byte N
Data Byte Count = X
Index Block Write Operation
Slave Address DC
Beginning Byte = N
Byte N + X - 1
Controller (Host)
General SMBus serial interface information for the 9DB1200C
starT bit
stoP bit
WRite
(h)
ICS (Slave/Receiver)
ACK
ACK
ACK
ACK
ACK
(h)
10
How to Read:
• Controller (host) will send start bit.
• Controller (host) sends the write address DC
• ICS clock will acknowledge
• Controller (host) sends the begining byte
• ICS clock will acknowledge
• Controller (host) will send a separate start bit.
• Controller (host) sends the read address DD
• 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 (if X
• Controller (host) will need to acknowledge each byte
• Controllor (host) will send a not acknowledge bit
• Controller (host) will send a stop bit
location = N
was written to byte 8)
WR
RD
RT
N
P
T
Index Block Read Operation
Slave Address DC
Beginning Byte = N
Slave Address DD
Controller (Host)
Not acknowledge
ACK
ACK
Repeat starT
starT bit
stoP bit
WRite
ReaD
(h)
(h)
.
ICS (Slave/Receiver)
Data Byte Count = X
Beginning Byte N
Byte N + X - 1
ACK
ACK
ACK
1414F—06/30/10
(h)
(h)
(h)