- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄360785 > ICS94203F-T Peripheral IC PDF資料下載
參數(shù)資料
| 型號： | ICS94203F-T |
| 英文描述： | Peripheral IC |
| 中文描述： | 外圍芯片 |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 183K |
| 代理商： | ICS94203F-T |
8
ICS94203
Byte 13: ICS Reserved Register
Byte 15: VCO Frequency Control Register
Note: The decimal representation of these 9 bits (Byte 15 bit
[7:0] & Byte 14 bit [7] ) + 8 is equal to the VCO divider value.
For example if VCO divider value of 36 is desired, user need
to program 36 - 8 = 28, namely, 0, 00011100 into byte 15 bit
& byte 14 bit 7.
Note: DON'T write a '1' into this register, it will
cause malfunction.
Byte 14: VCO Frequency Control Register
Note: The decimal representation of these 7 bits (Byte 14
[6:0]) + 2 is equal to the REF divider value .
VCO Programming Constrains
VCO Frequency ...................... 150MHz to 500MHz
VCO Divider Range ................ 8 to 519
REF Divider Range ................. 2 to 129
Phase Detector Stability .......... 0.3536 to 1.4142
Useful Formula
VCO Frequency = 14.31818 x VCO/REF divider value
Phase Detector Stabiliy = 14.038 x (VCO divider value)
-0.5
t
t
B
t
B
t
B
t
B
t
B
t
B
t
B
t
B
B
D
W
X
X
X
X
X
X
X
X
P
n
o
D
8
B
r
d
D
B
r
d
D
B
r
d
D
B
r
d
D
B
r
d
D
B
r
d
D
B
r
d
D
B
r
d
D
7
6
5
4
3
2
1
0
O
O
O
O
O
O
O
O
C
C
C
C
C
C
C
C
V
V
V
V
V
V
V
V
7
6
5
4
3
2
1
t
t
B
t
B
t
B
t
B
t
B
t
B
t
B
t
B
B
D
W
X
X
X
X
X
X
X
X
P
n
o
D
0
B
r
d
D
6
B
r
d
D
B
r
d
D
B
r
d
D
B
r
d
D
B
r
d
D
B
r
d
D
B
r
d
D
7
6
5
4
3
2
1
0
O
F
F
F
F
F
F
F
C
E
E
E
E
E
E
E
V
R
R
R
R
R
R
R
5
4
3
2
1
0
t
t
B
t
B
t
B
B
D
W
0
0
0
P
n
o
D
7
6
5
)
e
)
e
)
e
r
m
m
0
s
m
e
e
e
e
v
R
v
R
v
R
i
0
W
2
=
0
5
=
1
v
R
(
v
R
(
v
R
(
v
R
(
(
(
(
4
t
B
0
t
e
b
s
9
3
2
1
0
t
t
t
t
B
B
B
B
0
0
0
0
)
)
)
)
To program the VCO frequency for over-clocking.
0. Before trying to program our clock manually, consider using ICS provided software utilities for easy programming.
1. Select the frequency you want to over-clock from with the desire gear ratio (i.e. CPU:SDRAM:3V66:PCI ratio) by writing to
byte 0, or using initial hardware power up frequency.
2. Write 0001, 0111 (17
H
) to byte 6 for readback of 23 bytes (byte 0-22).
3. Read back byte 16-24 and copy values in these registers.
4. Re-initialize the write sequence.
5. Write a '1' to byte 8 bit 7 indicating you want to use byte 14 and 15 to control the VCO frequency.
6. Write to byte 14 & 15 with the desired VCO & REF divider values.
7. Write to byte 16 to 22 with the values you copy from step 3. This maintains the output divider mux controls the same gear ratio.
8. The above procedure is only needed when changing the VCO for the 1st pass. If VCO frequency needed to be changed again,
user only needs to write to byte 14 and 15 unless the system is to reboot.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICS94203yF-T | Programmable System Frequency Generator for PII/III⑩ |
| ICS94206 | Programmable System Frequency Generator for PII/III⑩ |
| ICS94206yF-T | Circular Connector; No. of Contacts:10; Series:; Body Material:Aluminum; Connecting Termination:Solder; Connector Shell Size:12; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:12-98 |
| ICS94215YF-T | Programmable System Clock Chip for AMD - K7⑩ Processor |
| ICS94215 | Replaced by SN74ABT16540A : 16-Bit Buffers/Drivers With 3-State Outputs 48-TSSOP -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS94203YF-T | 制造商:ICS 制造商全稱:ICS 功能描述:Programmable System Frequency Generator for PII/III⑩ |
| ICS94206 | 制造商:ICS 制造商全稱:ICS 功能描述:Programmable System Frequency Generator for PII/III⑩ |
| ICS94206YF-T | 制造商:ICS 制造商全稱:ICS 功能描述:Programmable System Frequency Generator for PII/III⑩ |
| ICS94209 | 制造商:ICS 制造商全稱:ICS 功能描述:Programmable Frequency Generator & Integrated Buffers for Pentium III Processor |
| ICS94209YF-T | 制造商:ICS 制造商全稱:ICS 功能描述:Programmable Frequency Generator & Integrated Buffers for Pentium III Processor |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。