6V49205B Datasheet, PDF (9/16 Pages) Integrated Device Technology – Industrial temperature range operation

6V49205B DATASHEET
General SMBus Serial Interface Information for 6V49205B
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)
T
starT bit
Slave Address D2_(H)
WR
WRite
Beginning Byte = N
Data Byte Count = X
Beginning Byte N
O
O
O
Byte N + X - 1
P
stoP bit
IDT (Slave/Receiver)
ACK
ACK
ACK
ACK
O
O
O
ACK
Note: I²C compatible. Native mode is SMBus Block mode
protocol. To use I²C Byte mode set the 2^7 bit in the
command Byte. No Byte count is used.
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 Read Operation
Controller (Host)
T
starT bit
Slave Address D2_(H)
WR
WRite
Beginning Byte = N
RT
Repeat starT
Slave Address D3_(H)
RD
ReaD
IDT (Slave/Receiver)
ACK
ACK
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
REVISION P 08/10/15
9
FREESCALE P10XX AND P20XX SYSTEM CLOCK W/SELECTABLE DDR FREQUENCY