CY28341-3
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 operation.
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 = 0
2:8
9
Slave address – 7 bits
Write = 0
10
Acknowledge from slave
10
Acknowledge from slave
11:18
Command Code – 8 bits
'00000000' stands for block operation
11:18
Command Code – 8 bits
'00000000' stands for block operation
19
20:27
28
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
......................
19
20
Acknowledge from slave
Repeat start
21:27
28
Slave address – 7 bits
Read = 1
29:36
37
29
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
38:45
46
30:37
38
....
39:46
47
....
Data Byte (N–1) –8 bits
Acknowledge from slave
Data Byte N –8 bits
Acknowledge from slave
Stop
....
48:55
56
....
....
....
....
....
....
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 = 0
2:8
9
Slave address – 7 bits
Write = 0
10
Acknowledge from slave
10
Acknowledge from slave
11:18
Command Code – 8 bits
11:18
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
'100xxxxx' stands for byte operation, bits[4:0] of the
command code represents the offset of the byte to be
accessed
19
20:27
28
Acknowledge from slave
Data byte from master – 8 bits
Acknowledge from slave
19
20
Acknowledge from slave
Repeat start
21:27
Slave address – 7 bits
Rev 1.0,November 21, 2006
Page 4 of 19
SPECTRALINEAR [ SPECTRALINEAR INC ]
