ICS951901 Datasheet, PDF (12/19 Pages) Integrated Circuit Systems – Programmable Frequency Generator & Integrated Buffers for Pentium III Processor

ICS951901
General I²C serial interface information for the ICS951901
How to Write:
• Controller (host) sends a start bit.
• Controller (host) sends the write address D2 _(H)
• ICS clock will acknowledge
• Controller (host) sends a dummy command code
• ICS clock will acknowledge
• Controller (host) sends a dummy byte count
• ICS clock will acknowledge
• Controller (host) starts sending Byte 0 through Byte 28
(see Note 2)
• ICS clock will acknowledge each byte one at a time
• Controller (host) sends a Stop bit
How to Write:
Controller (Host)
Start Bit
ICS (Slave/Receiver)
Address D2_(H)
Dummy Command Code
Dummy Byte Count
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
How to Read:
• Controller (host) will send start bit.
• Controller (host) sends the read address D3
(H)
• ICS clock will acknowledge
• ICS clock will send the byte count
• Controller (host) acknowledges
• ICS clock sends Byte 0 through byte 6 (default)
• ICS clock sends Byte 0 through byte X (if X was
(H)
written to byte 6).
• Controller (host) will need to acknowledge each byte
• Controller (host) will send a stop bit
How to Read:
Controller (Host)
Start Bit
ICS (Slave/Receiver)
Address D3_(H)
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
Byte Count
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
If 7_H has been written to B6
ACK
Byte 7
Byte 18
Byte 19
Byte 20
Stop Bit
ACK
ACK
ACK
*See notes on the following page.
0670B—07/15/04
If 1A_H has been written to B6
ACK
If 1B_H has been written to B6
ACK
If 1C_H has been written to B6
ACK
Stop Bit
Byte18
Byte 19
Byte 20
12