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