CY28316
Serial Data Interface
The CY28316 features a two-pin, serial data interface that can
be used to configure internal register settings that control
particular device functions.
Data Protocol
The clock driver serial protocol supports byte/word Write,
byte/word Read, block Write and block Read operations from
the controller. For block Write/Read operation, the bytes must
be accessed in sequential order from lowest to highest byte,
with the ability to stop after any complete byte has been trans-
ferred. For byte/word 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.
The definition for the command code is defined in
Table 1.
Table 1. Command Code Definition
Bit
7
6:0
Descriptions
0 = Block read or block write operation
1 = Byte/Word read or byte/word write operation
Byte offset for byte/word read or write operation. For block read or write operations, these bits
need to be set at ‘0000000.’
Table 2. Block Read and Block Write Protocol
Block Write Protocol
Bit
1
2:8
9
10
11:18
19
20:27
28
29:36
37
38:45
46
...
...
...
...
Description
Start
Slave address – 7 bits
Write
Acknowledge from slave
Command Code – 8 bits
‘00000000’ stands for block operation
Acknowledge from slave
Byte Count – 8 bits
Acknowledge from slave
Data byte 0 – 8 bits
Acknowledge from slave
Data byte 1 – 8 bits
Acknowledge from slave
Data Byte N/Slave Acknowledge...
Data Byte N – 8 bits
Acknowledge from slave
Stop
Bit
1
2:8
9
10
11:18
19
20
21:27
28
29
30:37
38
39:46
47
48:55
56
...
...
...
...
Table 3. Word Read and Word Write Protocol
Word Write Protocol
Bit
1
2:8
9
10
Description
Start
Slave address – 7 bits
Write
Acknowledge from slave
Bit
1
2:8
9
10
Word Read Protocol
Description
Start
Slave address – 7 bits
Write
Acknowledge from slave
Block Read Protocol
Description
Start
Slave address – 7 bits
Write
Acknowledge from slave
Command Code – 8 bits
‘00000000’ stands for block operation
Acknowledge from slave
Repeat start
Slave address – 7 bits
Read
Acknowledge from slave
Byte count from slave – 8 bits
Acknowledge
Data byte from slave – 8 bits
Acknowledge
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 20, 2006
Page 3 of 17
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