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W312-02 Fiches technique(PDF) 4 Page - SpectraLinear Inc

No de pièce W312-02
Description  FTG for VIA™ K7 Series Chipset with Programmable Output Frequency
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Fabricant  SPECTRALINEAR [SpectraLinear Inc]
Site Internet  http://www.spectralinear.com
Logo SPECTRALINEAR - SpectraLinear Inc

W312-02 Fiches technique(HTML) 4 Page - SpectraLinear Inc

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W312-02
Rev 1.0, November 27, 2006
Page 4 of 19
Serial Data Interface
The W312-02 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, system
controller can access individual indexed byte. The offset of the
indexed byte is encoded in the command code.
.The block write and block read protocol is outlined in Table 1
while Table 2 outlines the corresponding byte write and byte
read protocol. The slave receiver address is 11010010 (D2h)
Table 1. Command Code Definitions
Bit
Descriptions
7
0 = Block read or block write operation
1 = Byte/Word read or byte/word write operation
6:0
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
Block Read Protocol
Bit
Description
Bit
Description
1Start
1Start
2:8
Slave address – 7 bits
2:8
Slave address – 7 bits
9Write
9Write
10
Acknowledge from slave
10
Acknowledge from slave
11:18
Command Code – 8 bits
‘00000000’ stands for block operation
11:18
Command Code – 8 bits
‘00000000’ stands for block operation
19
Acknowledge from slave
19
Acknowledge from slave
20:27
Byte Count – 8 bits
20
Repeat start
28
Acknowledge from slave
21:27
Slave address – 7 bits
29:36
Data byte 0 – 8 bits
28
Read
37
Acknowledge from slave
29
Acknowledge from slave
38:45
Data byte 1 – 8 bits
30:37
Byte count from slave – 8 bits
46
Acknowledge from slave
38
Acknowledge
...
Data Byte N/Slave Acknowledge...
39:46
Data byte from slave – 8 bits
...
Data Byte N – 8 bits
47
Acknowledge
...
Acknowledge from slave
48:55
Data byte from slave – 8 bits
...
Stop
56
Acknowledge
...
Data bytes from slave/Acknowledge
...
Data byte N from slave – 8 bits
...
Not Acknowledge
...
Stop


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