CY28372
The block write and block read protocol is outlined in Table 3
while Table 4 outlines the corresponding byte write and byte
read protocol. The slave receiver address is 11010010 (D2h).
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 blockread orblock writeoperations, thesebits
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
Acknowledge from slave
Repeat start
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
21:27
28
Slave address – 7 bits
Read = 1
29:36
37
29
Acknowledge from slave
Byte count from slave – 8 bits
Acknowledge
38:45
46
30:37
38
....
39:46
47
Data byte from slave – 8 bits
Acknowledge
....
Data Byte (N–1) –8 bits
Acknowledge from slave
Data Byte N –8 bits
Acknowledge from slave
Stop
....
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 = 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
'1xxxxxxx' stands for byte operation, bits[6:0] of the
command code represents the offset of the byte to
be accessed
'1xxxxxxx' stands for byte operation, bits[6:0] of the
command code represents the offset of the byte to
be accessed
19
Acknowledge from slave
19
20
Acknowledge from slave
Repeat start
20:27
Data byte from master – 8 bits
Rev 1.0,November 20, 2006
Page 4 of 17
SPECTRALINEAR [ SPECTRALINEAR INC ]
