CY28342
Document #: 38-07349 Rev. *A
Page 5 of 22
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
Bit
Description
Bit
Description
1Start
1Start
2:8
Slave address – 7 bits
2:8
Slave address – 7 bits
9Write
9Write
10
Acknowledge from slave
10
Acknowledge from slave
11:18
Command code – 8-bit “00000000” stands for
block operation
11:18
Command code – 8-bit “00000000” stands for
block operation
19
Acknowledge from slave
19
Acknowledge from slave
20:27
Byte count –8 bits
20
Repeat start
28
Acknowledge from slave
21:27
Slave address – 7 bits
29:36
Data byte 0 – 8 bits
28
Read
37
Acknowledge from slave
29
Acknowledge from slave
38:45
Data byte 1 – 8 bits
30:37
Byte count from slave – 8 bits
46
Acknowledge from slave
38
Acknowledge
....
Data byte N/slave acknowledge...
39:46
Data byte from slave – 8 bits
....
Data byte N – 8 bits
47
Acknowledge
....
Acknowledge from slave
48:55
Data byte from slave – 8 bits
....
Stop
56
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
Bit
Description
Bit
Description
1
Start
1
Start
2:8
Slave address – 7 bits
2:8
Slave address – 7 bits
9
Write
9
Write
10
Acknowledge from slave
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
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
19
Acknowledge from slave
20:27
Byte count – 8 bits
20
Repeat start
28
Acknowledge from slave
21:27
Slave address – 7 bits
29
Stop
28
Read
29
Acknowledge from slave
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