ICS94236 Datasheet, PDF (3/17 Pages) Integrated Circuit Systems – Programmable System Clock Chip for AMD - K7™ processor

ICS94236
General I²C serial interface information for the ICS94236
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 20
(see Note)
• ICS clock will acknowledge each byte one at a time
• Controller (host) sends a Stop bit
How to Write:
Controller (Host)
Start Bit
Address D2_(H)
ICS (Slave/Receiver)
Dummy Command Code
Dummy Byte Count
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
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 8 (default)
• ICS clock sends Byte 0 through byte X (if X was
(H)
written to byte 8).
• Controller (host) will need to acknowledge each byte
• Controller (host) will send a stop bit
How to Read:
Controller (Host)
Start Bit
ICS (Slave /Receive r)
Address D3_(H)
ACK
ACK
ACK
ACK
ACK
ACK
ACK
ACK
If 7_H has been written to B8
ACK
Byte 18
Byte 19
Byte 20
Stop Bit
*See notes on the following page.
0451A—01/10/03
If 12_H has been written to B8
ACK
If 13_H has been written to B8
ACK
If 14_H has been written to B8
ACK
Stop Bit
3