W305B Datasheet, PDF (6/20 Pages) Cypress Semiconductor – Frequency Controller with System Recovery for Intel Integrated Core Logic

W305B
Table 2. Block Read and Block Write Protocol (continued)
Block Write Protocol
Bit
Description
...
Data Byte N – 8 bits
...
Acknowledge from slave
...
Stop
Table 3. Word Read and Word Write Protocol
Word Write Protocol
Bit
Description
1
2:8
9
10
11:18
19
20:27
28
29:36
37
38
Start
Slave address – 7 bit
Write
Acknowledge from slave
Command Code – 8 bit
‘1xxxxxxx’ stands for byte or word operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
Acknowledge from slave
Data byte low– 8 bits
Acknowledge from slave
Data byte high – 8 bits
Acknowledge from slave
Stop
Table 4. Byte Read and Byte Write Protocol
Byte Write Protocol
Bit
Description
1
Start
2:8 Slave address – 7 bit
9
Write
10
Acknowledge from slave
11:18
Command Code – 8 bit
‘1xxxxxxx’ stands for byte operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
19
Acknowledge from slave
20:27 Data byte – 8 bits
28
Acknowledge from slave
29
Stop
Bit
47
48:55
56
...
...
...
...
Block Read Protocol
Description
Acknowledge
Data byte from slave – 8 bits
Acknowledge
Data bytes from slave/Acknowledge
Data byte N from slave – 8 bits
Not Acknowledge
Stop
Bit
1
2:8
9
10
11:18
19
20
21:27
28
29
30:37
38
39:46
47
48
Word Read Protocol
Description
Start
Slave address – 7 bit
Write
Acknowledge from slave
Command Code – 8 bit
‘1xxxxxxx’ stands for byte or word operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
Acknowledge from slave
Repeat start
Slave address – 7 bits
Read
Acknowledge from slave
Data byte low from slave – 8 bits
Acknowledge
Data byte high from slave – 8 bits
NOT acknowledge
Stop
Bit
1
2:8
9
10
11:18
19
20
21:27
28
Byte Read Protocol
Description
Start
Slave address – 7 bit
Write
Acknowledge from slave
Command Code – 8 bit
‘1xxxxxxx’ stands for byte operation
bit[6:0] of the command code represents the offset
of the byte to be accessed
Acknowledge from slave
Repeat start
Slave address – 7 bits
Read
Rev 1.0, November 20, 2006
Page 6 of 20