CY28342
Table 2. Command Code Definition
Bit
Description
7
0 = Block Read or block Write operation
1 = Byte Read or byte Write operation
(6:0)
Byte offset for byte Read or byte Write operations. For block Read or block Write operations, these bits
should be “0000000”
Table 3. Block Read and Block Write Protocol
Block Write Protocol
Block 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
Command code – 8-bit “00000000” stands for
block operation
Command code – 8-bit “00000000” stands for
block operation
11:18
11:18
19
20:27
28
Acknowledge from slave
Byte count –8 bits
19
20
Acknowledge from slave
Repeat start
Acknowledge from slave
Data byte 0 – 8 bits
21:27
28
Slave address – 7 bits
Read
29:36
37
Acknowledge from slave
Data byte 1 – 8 bits
29
Acknowledge from slave
Byte count from slave – 8 bits
Acknowledge
38:45
46
30:37
38
Acknowledge from slave
Data byte N/slave acknowledge...
Data byte N – 8 bits
Acknowledge from slave
Stop
....
39:46
47
Data byte from slave – 8 bits
Acknowledge
....
....
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 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
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
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
11:18
11:18
19
20:27
28
Acknowledge from slave
Byte count – 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
Rev 1.0,November 20, 2006
Page 5 of 21
SPECTRALINEAR [ SPECTRALINEAR INC ]
