CY28341-2
Data Protocol
Power Management Functions
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 2.
All clocks can be individually enabled or stopped via the
two-wire control interface. All clocks are stopped in the low
state. All clocks maintain a valid high period on transitions from
running to stop and on transitions from stopped to running
when the chip was not powered down. On power up, the VCOs
will stabilize to the correct pulse widths within about 0.5 ms.
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 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
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.
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
Start
1
2:8
9
Start
2:8
9
Slave address – 7 bits
Write
Slave address – 7 bits
Write
10
Acknowledge from slave
10
Acknowledge from slave
11:18
Command Code – 8-bit ‘00000000’ stands for
block operation
11:18
Command Code – 8-bit ‘00000000’ stands for
block operation
19
Acknowledge from slave
19
20
Acknowledge from slave
Repeat start
20:27 Byte Count – 8 bits
28 Acknowledge from slave
29:36 Data byte 0 – 8 bits
37 Acknowledge from slave
38:45 Data byte 1 – 8 bits
21:27
28
Slave address – 7 bits
Read
29
Acknowledge from slave
Byte count from slave – 8 bits
Acknowledge
30:37
38
46
....
....
....
....
Acknowledge from slave
Data Byte N/Slave Acknowledge...
Data Byte N – 8 bits
Acknowledge from slave
Stop
39:46
47
Data byte from slave – 8 bits
Acknowledge
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
Rev 1.0,November 21, 2006
Page 4 of 18
SPECTRALINEAR [ SPECTRALINEAR INC ]
