參數(shù)資料
型號(hào): CY28506OC
廠商: CYPRESS SEMICONDUCTOR CORP
元件分類: XO, clock
英文描述: 166.7 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO28
封裝: 5.30 MM, SSOP-28
文件頁(yè)數(shù): 4/9頁(yè)
文件大?。?/td> 85K
代理商: CY28506OC
CY28506
Document #: 38-07295 Rev. **
Page 4 of 9
Note:
1.
The SMBus controlled Dial-a-Frequency feature is available in this device via Byte 2 and byte 3.
Byte 3: Dial-a-Frequency Control Register R
Bit
@Pup
Pin#
Name
Description
7
0
Reserved
6
0
R5, MSB
These bits are for programming the PLL
s internal register. This access allows the
user to modify the CPU frequency at very high resolution (accuracy)
5
0
R4
4
0
R3
3
0
R2
2
0
R1
1
0
R0, LSB
0
0
DAFEN
0 = Hardware FS(0:2) selected, 1 = Dial-a-Frequency registered selected
R O M
L a tc h
S M B u s
B yte 3
S M B u s
B yte 2
N R e g is te r
R R e g is te r
B y te 3 W rite
B y te 2 W rite
D A F E N
Figure 1. Dial-a-Frequency
Feature
[1]
Table 2. P is a PLL Constant that Depends on the
Frequency Selection prior to Accessing the
Dial-a-Frequency Feature
FS(2:0)
P
XXX
96016000
Table 3. Spread Spectrum Clock Generation (SSCG)
Mode
Byte0,
Bit6
SST1
Byte0, Bit5
SST0
Byte0, Bit4
% Spread
0
0
0
0.5% Lexmark
0
0
1
1.0% Lexmark
0
1
0
0.5% Linear
0
1
1
1.0% Linear
1
0
0
±0.25% Lexmark
1
0
1
±0.5% Lexmark
1
1
0
±0.25% Linear
1
1
1
±0.5% Linear
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