W311 Datasheet, PDF (4/19 Pages) Silicon Laboratories – FTG for VIA™ Pro-266 DDR Chipset

W311
Table 3. Word Read and Word Write Protocol
Word Write Protocol
Bit
Description
1
Start
2:8 Slave address - 7 bits
9
Write
10
Acknowledge from slave
11:18
Command Code - 8 bits
‘1xxxxxxx’ stands for byte or word operation
bit[6:0] of the command code represents the off-
set of the byte to be accessed
19
Acknowledge from slave
20:27 Data byte low- 8 bits
28
Acknowledge from slave
29:36 Data byte high - 8 bits
37
Acknowledge from slave
38
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 bits
Write
Acknowledge from slave
Command Code - 8 bits
‘1xxxxxxx’ stands for byte or word operation
bit[6:0] of the command code represents the off-
set 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
Table 4. Byte Read and Byte Write Protocol
Byte Write Protocol
Bit
Description
1
Start
2:8 Slave address - 7 bits
9
Write
10
Acknowledge from slave
11:18
Command Code - 8 bits
‘1xxxxxxx’ stands for byte operation
bit[6:0] of the command code represents the off-
set of the byte to be accessed
19
Acknowledge from slave
20:27 Data byte - 8 bits
28
Acknowledge from slave
29
Stop
Bit
1
2:8
9
10
11:18
19
20
21:27
28
29
30:37
38
39
Byte Read Protocol
Description
Start
Slave address - 7 bits
Write
Acknowledge from slave
Command Code - 8 bits
‘1xxxxxxx’ stands for byte operation
bit[6:0] of the command code represents the off-
set of the byte to be accessed
Acknowledge from slave
Repeat start
Slave address - 7 bits
Read
Acknowledge from slave
Data byte from slave - 8 bits
Not Acknowledge
Stop
4