CY28347 Cypress Semiconductor, CY28347 Datasheet - Page 4

• Manufacturer Part Number: CY28347
• Description: Universal Single-chip Clock Solution
• Manufacturer: Cypress Semiconductor

Document #: 38-07352 Rev. *C
Serial Data Interface
To enhance the flexibility and function of the clock synthesizer,
a two-signal serial interface is provided. Through the Serial
Data Interface, various device functions such as individual
clock output buffers, etc., can be individually enabled or
disabled.
The registers associated with the Serial Data Interface
initializes to their default setting upon power-up, and therefore
use of this interface is optional. Clock device register changes
are normally made upon system initialization, if any are
required. The interface can also be used during system
operation for power management functions.
Table 4. Command Code Definition
Table 5. Block Read and Block Write Protocol
Table 6. Byte Read and Byte Write Protocol
20:27
29:36
38:45
11:18
Bit
2:8
Bit
2:8
10
19
28
37
46
....
....
....
....
1
9
1
9
(6:0)
Bit
7
Command Code - 8 Bit “00000000” stands for block
Data Byte N/Slave Acknowledge...
Block Write Protocol
Byte Write Protocol
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”
Acknowledge from slave
Acknowledge from slave
Acknowledge from slave
Acknowledge from slave
Acknowledge from slave
Acknowledge from slave
Slave address - 7 bits
Slave address - 7 bits
Data Byte N - 8 bits
Data byte 0 - 8 bits
Data byte 1 - 8 bits
Byte Count - 8 bits
Description
Description
operation
Write
Write
Start
Stop
Start
Data Protocol
The clock driver serial protocol accepts Byte Write, Byte Read,
Block Write, and Block Read operation from the controller. For
Block Write/Read operation, the bytes must be accessed in
sequential order from lowest to highest byte (most significant
bit first) with the ability to stop after any complete byte has
been transferred. For Byte Write and Byte Read operations,
the system controller can access individual indexed bytes. The
offset of the indexed byte is encoded in the command code,
as described in Table 4.
The Block Write and Block Read protocol is outlined in Table 5
while Table 6 outlines the corresponding Byte Write and Byte
Read protocol. The slave receiver address is 11010010 (D2H).
11:18
21:27
30:37
39:46
48:55
2:8
Bit
Bit
2:8
10
19
20
28
29
38
47
56
....
....
....
....
1
9
1
9
Description
Command Code - 8 Bit “00000000” stands for block
Data bytes from slave/Acknowledge
Block Read Protocol
Byte Read Protocol
Data byte N from slave - 8 bits
Byte count from slave - 8 bits
Data byte from slave - 8 bits
Data byte from slave - 8 bits
Acknowledge from slave
Acknowledge from slave
Acknowledge from slave
Slave address - 7 bits
Slave address - 7 bits
Slave address - 7 bits
Not Acknowledge
Acknowledge
Acknowledge
Acknowledge
Description
Repeat start
Description
operation
Write
Read
Write
Start
Stop
Start
CY28347
Page 4 of 22