C9730
Low EMI Clock Generator for SiS730/ AMD K7 Applications
Preliminary
I2C Communication Waveform
Transmit
ACK
ACK
ACK
ACK
ACK
Receive
COMMAND BYTE
(Don't Care)
BYTE COUNT
(Don't Care)
BYTE 0
(Valid)
BYTE N-1
(Valid)
1
1
0
1
0
0
1
0
SDATA
MSB
LSB
8
8
8
8
SCLK
START CONDITION
STOP CONDITION
Fig.6a (WRITE)
Transmit
ACK BYTE COUNT
BYTE 0
(Valid)
BYTE1
(Valid)
BYTE N-1
(Valid)
Receiv
ACK
ACK
ACK
ACK
1
1
0
1
0
1
0
1
(Valid)
SDATA
MSB
LSB
8
8
8
8
SCLK
START CONDITION
STOP CONDITION
Fig.6b (READ)
I2C Test Circuitry
+ 5V
2.2 K
Device under Test
DATAIN
SDATA
SCLK
+ 5V
2.2 K
+ 5V
DATAOUT
2.2 K
CLOCK
Fig.7
Note: Buffer is 7407 with VCC @ 5.0 V
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035, USA TEL: 408-263-6300, FAX 408-263-6571
Rev 1.0
4/26/2000
Page 10 of 19
http://www.imicorp.com
CYPRESS [ CYPRESS ]
