參數(shù)資料
型號： CYW305OXC
廠商： CYPRESS SEMICONDUCTOR CORP
元件分類： XO, clock
英文描述： Frequency Controller with System Recovery for Intel Integrated Core Logic
中文描述： 200 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO56
封裝： 0.300 INCH, LEAD FREE, SSOP-56
文件頁數(shù)： 5/21頁
文件大小： 247K
代理商： CYW305OXC
W305B
Document #: 38-07262 Rev. *B
Page 5 of 21
Serial Data Interface
The W305B 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 definition for the command code is given in
Table 1.
CPU 133-MHz
SDRAM 133MHz
3V66 66-MHz
PCI 33-MHz
REF 14.318-MHz
USB 48-MHz
DOT 48-MHz
APIC 16.6-MHz
Cycle Repeat
0 ns 10 ns 20 ns 30 ns 40 ns
Figure 5. Group Offset Waveform (133-MHz CPU/133-MHz SDRAM)
Table 1. Command Code Definition
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
1
2:8
9
10
11:18
Description
Bit
1
2:8
9
10
11:18
Description
Start
Slave address – 7 bit
Write
Acknowledge from slave
Command Code – 8 bit
‘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...
Start
Slave address – 7 bit
Write
Acknowledge from slave
Command Code – 8 bit
‘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
19
19
20
20:27
28
29:36
37
38:45
46
...
21:27
28
29
30:37
38
39:46
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