W164 Datasheet, PDF (4/11 Pages) Cypress Semiconductor – Spread Spectrum Desktop/Notebook System Frequency Generator

W164
Table 3. Byte Writing Sequence
Byte
Sequence
1
Byte Name
Slave Address
Bit Sequence
11010010
2
Command
Don’t Care
Code
3
Byte Count
Don’t Care
4
Data Byte 0
Don’t Care
5
Data Byte 1
6
Data Byte 2
7
Data Byte 3
Refer to Table 4
8
Data Byte 4
9
Data Byte 5
10
Data Byte 6
Byte Description
Commands the W164 to accept the bits in Data Bytes 3–6 for internal
register configuration. Since other devices may exist on the same com-
mon serial data bus, it is necessary to have a specific slave address for
each potential receiver. The slave receiver address for the W164 is
11010010. Register setting will not be made if the Slave Address is not
correct (or is for an alternate slave receiver).
Unused by the W164, therefore bit values are ignored (“don’t care”). This
byte must be included in the data write sequence to maintain proper byte
allocation. The Command Code Byte is part of the standard serial com-
munication protocol and may be used when writing to another addressed
slave receiver on the serial data bus.
Unused by the W164, therefore bit values are ignored (“don’t care”). This
byte must be included in the data write sequence to maintain proper byte
allocation. The Byte Count Byte is part of the standard serial communi-
cation protocol and may be used when writing to another addressed slave
receiver on the serial data bus.
Refer to Cypress SDRAM drivers.
The data bits in these bytes set internal W164 registers that control device
operation. The data bits are only accepted when the Address Byte bit
sequence is 11010010, as noted above. For description of bit control
functions, refer to Table 4, Data Byte Serial Configuration Map.
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