CY28409 Cypress Semiconductor, CY28409 Datasheet - Page 4

• Manufacturer Part Number: CY28409
• Description: Clock Synthesizer with Differential SRC and CPU Outputs
• Manufacturer: Cypress Semiconductor

Document #: 38-07445 Rev. *B
Table 4. Block Read and Block Write Protocol(continued)
Table 5. Byte Read and Byte Write protocol
Control Registers
Byte 0:Control Register 0
20:27
29:36
38:45
11:18
20:27
Bit
2:8
Bit
Bit
28
37
46
....
....
....
....
....
....
10
19
28
29
1
9
7
6
5
4
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
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
Stop
@Pup
0
1
0
0
Block Write Protocol
Byte Write Protocol
Reserved
PCIF
PCI
Reserved
Reserved
Description
Description
Name
PCI Drive Strength Override
0 = Force All PCI and PCIF Outputs to Low Drive Strength
1 = Force All PCI and PCIF Outputs to High Drive Strength
Reserved, Set = 0
Reserved, Set = 0
Reserved, Set = 0
21:27
30:37
39:46
48:55
21:27
30:37
11:18
Bit
20
28
29
38
47
56
....
....
....
Bit
2:8
10
19
20
28
29
38
39
1
9
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
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
Read = 1
Acknowledge from slave
Data byte from slave – 8 bits
Acknowledge from master
Stop
Description
Block Read Protocol
Byte Read Protocol
Description
Description
CY28409
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