NB3W800L_16 Datasheet, PDF (14/17 Pages) ON Semiconductor – Differential 1:8 HCSLCompatible Push-Pull Clock

NB3W800L
General SMBus Serial Interface Information for NB3W800L
How to Write
• Controller (host) sends a start bit
• Controller (host) sends the write address
• Clock(device) will acknowledge
• Controller (host) sends the beginning byte location = N
• Clock(device) will acknowledge
• Controller (host) sends the byte count = X
• Clock(device) will acknowledge
• Controller (host) starts sending Byte N through Byte
N+X−1
• Clock(device) will acknowledge each byte one at a
time
• Controller (host) sends a Stop bit
Index Block Write Operation
Controller (Host)
Clock (Device)
T
starT bit
Slave Address
WR
WRite
ACK
Beginning Byte = N
ACK
Data Byte Count = X
ACK
Beginning Byte N
ACK
O
O
X Byte
O
O
O
O
Byte N + X − 1
ACK
P
stoP bit
How to Read
• Controller (host) will send a start bit
• Controller (host) sends the write address
• Clock(device) will acknowledge
• Controller (host) sends the beginning byte location = N
• Clock(device) will acknowledge
• Controller (host) will send a separate start bit
• Controller (host) sends the read address
• Clock(device) will acknowledge
• Clock(device) will send the data byte count = X
• Clock(device) sends Byte N+X−1
• Clock(device) 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 Read Operation
Controller (Host)
Clock (Device)
T
starT bit
Slave Address
WR
WRite
ACK
Beginning Byte = N
ACK
RT Repeat starT
Slave Address
RD
ReaD
ACK
ACK
ACK
O
O
O
X Byte
N Not acknowledge
P
stoP bit
Data Byte Count = X
Beginning Byte N
O
O
O
Byte N + X - 1
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