9SQL4952 Datasheet, PDF (11/20 Pages) Integrated Device Technology – 2-output CK420BQ Derivative

9SQL4952 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
Index Block Write Operation
Controller (Host)
IDT (Slave/Receiver)
T
starT bit
Slave Address
WR
WRite
ACK
Beginning Byte = N
ACK
Data Byte Count = X
ACK
Beginning Byte N
ACK
O
O
O
O
O
O
Byte N + X - 1
ACK
P
stoP bit
Note: SMBus Read/Write Address is Latched on SADR
pin.
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
written to Byte
Byte
8)
0
through
Byte
X
(if
X_(H)
was
• 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)
IDT (Slave/Receiver)
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
N
Not acknowledge
P
stoP bit
Data Byte Count=X
Beginning Byte N
O
O
O
Byte N + X - 1
DECEMBER 12, 2016
11
2-OUTPUT CK420BQ DERIVATIVE