16©2017 Integrated Device Technology, Inc. December 1, 2017
9ZML1233E / 9ZML1253E Datasheet
General SMBus Serial Interface Information
How to Write
▪ Controller (host) sends a start bit
▪ Controller (host) sends the write address
▪ IDT clock will acknowledge
▪ Controller (host) sends the beginning byte location = N
▪ IDT clock will acknowledge
▪ Controller (host) sends the 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
9ZML1233E / 9ZML1253E SMBus Addressing
How to Read
▪ Controller (host) will send a start bit
▪ Controller (host) sends the write address
▪ IDT clock will acknowledge
▪ Controller (host) sends the beginning byte location = N
▪ IDT clock will acknowledge
▪ Controller (host) will send a separate start bit
▪ Controller (host) sends the read address
▪ 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
Index Block Write Operation
Controller (Host) IDT (Slave/Receiver)
TstarT bit
Slave Address
WR WRite
ACK
Beginning Byte = N
ACK
Data Byte Count = X
ACK
Beginning Byte N
X Byte
ACK
O
OO
OO
O
Byte N + X - 1
ACK
PstoP bit
SMB_A0_tri SMBus Address (Read/Write bit = 0)
0D8
MDA
1DE
Index Block Read Operation
Controller (Host) IDT (Slave/Receiver)
T starT bit
Slave Address
WR WRite
ACK
Beginning Byte = N
ACK
RT Repeat starT
Slave Address
RD ReaD
ACK
Data Byte Count=X
ACK
X Byte
Beginning Byte N
ACK
O
OO
OO
O
Byte N + X - 1
N Not acknowledge
PstoP bit
