W311
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 bits
Write
2:8
9
Slave address – 7 bits
Write
10
Acknowledge from slave
10
Acknowledge from slave
11:18
Command Code – 8 bits
11:18
Command Code – 8 bits
‘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 bits
Write
2:8
9
Slave address – 7 bits
Write
10
Acknowledge from slave
10
Acknowledge from slave
11:18
Command Code – 8 bits
11:18
Command Code – 8 bits
‘1xxxxxxx’ stands for byte operation
bit[6:0] of the command code represents the
offset of the byte to be accessed
‘1xxxxxxx’ stands for byte 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 – 8 bits
Acknowledge from slave
Stop
19
20
Acknowledge from slave
Repeat start
21:27
28
Slave address – 7 bits
Read
29
29
Acknowledge from slave
Data byte from slave – 8 bits
Not Acknowledge
Stop
30:37
38
39
Rev 1.0,November 25, 2006
Page 4 of 18
SPECTRALINEAR [ SPECTRALINEAR INC ]
