ics9ex21501 Integrated Device Technology, ics9ex21501 Datasheet - Page 10

• Manufacturer Part Number: ics9ex21501
• Description: 15 Output Pcie G2/qpi Differential Buffer With 2 1 Input Mux
• Manufacturer: Integrated Device Technology

How to Write:
• Controller (host) sends a start bit.
• Controller (host) sends the write address D4
• ICS clock will acknowledge
• Controller (host) sends the beginning 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: SMBus address is selectable among 4 addresses.
See tabel on page 2.
IDT
9EX21501
15 Output PCIe G2/QPI Differential Buffer with 2:1 Input Mux
Byte N + X -1
®
W R
15 Output PCIe G2/QPI Differential Buffer with 2:1 Input Mux
P
T
Beginning Byte N
Data Byte Count = X
Index Block Write Operation
Slave Address D4
Beginning Byte = N
Byte N + X - 1
Controlle r (Host)
General SMBus serial interface information for the 9EX21501
starT bit
stoP bit
W Rite
(H )
ICS (Sla ve /Re ce ive r)
ACK
ACK
ACK
ACK
ACK
(H)
10
How to Read:
• Controller (host) will send start bit.
• Controller (host) sends the write address D4
• 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 D5
• 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
• Controller (host) will send a not acknowledge bit
• Controller (host) will send a stop bit
location = N
was written to byte 8)
W R
RD
RT
N
P
T
Index Block Read Operation
Slave Address D4
Beginning Byte = N
Slave Address D5
Controlle r (Host)
Not acknowledge
ACK
ACK
Repeat starT
starT bit
stoP bit
W Rite
ReaD
(H )
(H )
.
ICS (Sla ve /Re ce ive r)
Data Byte Count = X
Beginning Byte N
Byte N + X - 1
Datasheet
ACK
ACK
ACK
1578—01/18/11
(H)
(H)
(H)