CY28341-3
Table 2. Command Code Definition
Bit
7
(6:0)
Description
0 = Block read or block write operation
1 = Byte read or byte write operation
Byte offset for byte read or byte write operation.
For block read or block write operations, these
bits should be '0000000'
Table 3. Block Read and Block Write Protocol
Block Write Protocol
Bit
1
2:8
9
10
11:18
19
20:27
28
29:36
37
38:45
46
....
....
....
....
....
....
Start
Slave address – 7 bits
Write = 0
Acknowledge from slave
Command Code – 8 bits
'00000000' stands for block operation
Acknowledge from slave
Byte Count – 8 bits
Acknowledge from slave
Data byte 1 – 8 bits
Acknowledge from slave
Data byte 2 – 8 bits
Acknowledge from slave
......................
Data Byte (N–1) –8 bits
Acknowledge from slave
Data Byte N –8 bits
Acknowledge from slave
Stop
Description
Bit
1
2:8
9
10
11:18
19
20
21:27
28
29
30:37
38
39:46
47
48:55
56
....
....
....
Table 4. Byte Read and Byte Write Protocol
Byte Write Protocol
Bit
1
2:8
9
10
11:18
Start
Slave address – 7 bits
Write = 0
Acknowledge from slave
Command Code – 8 bits
'100xxxxx' stands for byte operation, bits[4:0] of the
command code represents the offset of the byte to be
accessed
Acknowledge from slave
Data byte from master – 8 bits
Acknowledge from slave
Description
Bit
1
2:8
9
10
11:18
Start
Slave address – 7 bits
Write = 0
Acknowledge from slave
Command Code – 8 bits
'100xxxxx' stands for byte operation, bits[4:0] of the
command code represents the offset of the byte to be
accessed
Acknowledge from slave
Repeat start
Slave address – 7 bits
Byte Read Protocol
Description
Start
Slave address – 7 bits
Write = 0
Acknowledge from slave
Command Code – 8 bits
'00000000' stands for block operation
Acknowledge from slave
Repeat start
Slave address – 7 bits
Read = 1
Acknowledge from slave
Byte count from slave – 8 bits
Acknowledge from master
Data byte from slave – 8 bits
Acknowledge from master
Data byte from slave – 8 bits
Acknowledge from master
Data byte N from slave – 8 bits
Acknowledge from master
Stop
Block Read Protocol
Description
19
20:27
28
19
20
21:27
Rev 1.0, November 21, 2006
Page 4 of 19
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