CY28439 SpectraLinear, CY28439 Datasheet - Page 4

• Manufacturer Part Number: CY28439
• Description: Clock Generator
• Manufacturer: SpectraLinear

Rev 1.0, November 21, 2006
Table 1. Command Code Definition
Table 2. Block Read and Block Write Protocol
Table 3. Byte Read and Byte Write Protocol
27:20
36:29
45:38
27:20
18:11
18:11
(6:0)
Bit
8:2
Bit
8:2
Bit
10
19
28
37
46
....
....
....
....
10
19
28
29
1
9
1
9
7
Start
Slave address – 7 bits
Write
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Byte Count – 8 bits
(Skip this step if I
Acknowledge from slave
Data byte 1 – 8 bits
Acknowledge from slave
Data byte 2 – 8 bits
Acknowledge from slave
Data Byte /Slave Acknowledges
Data Byte N – 8 bits
Acknowledge from slave
Stop
Start
Slave address – 7 bits
Write
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Data byte – 8 bits
Acknowledge from slave
Stop
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'
Block Write Protocol
Byte Write Protocol
2
C_EN bit set)
Description
Description
Description
27:21
37:30
46:39
55:48
18:11
18:11
27:21
37:30
Bit
8:2
10
19
20
28
29
38
47
56
....
....
....
....
8:2
Bit
10
19
20
28
29
38
39
1
9
1
9
Start
Slave address – 7 bits
Write
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Repeat start
Slave address – 7 bits
Read = 1
Acknowledge from slave
Byte Count from slave – 8 bits
Acknowledge
Data byte 2 from slave – 8 bits
Acknowledge
Data bytes from slave / Acknowledge
Data Byte N from slave – 8 bits
NOT Acknowledge
Stop
Data byte 1 from slave – 8 bits
Acknowledge
Start
Slave address – 7 bits
Write
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Repeated start
Slave address – 7 bits
Read
Acknowledge from slave
Data from slave – 8 bits
NOT Acknowledge
Stop
Block Read Protocol
Byte Read Protocol
Description
Description
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CY28439
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