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ICS950813 数据表(PDF) 5 Page - Integrated Circuit Systems

部件名 ICS950813
功能描述  Frequency Generator with 200MHz Differential CPU Clocks
PDF  22 Pages
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制造商  ICST [Integrated Circuit Systems]
网页  http://www.icst.com
标志 ICST - Integrated Circuit Systems

ICS950813 数据表(HTML) 5 Page - Integrated Circuit Systems

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ICS950813
Advance Information
0708—10/10/02
Host Swing Select Functions
MULTSEL
0
1
Output
Ioh = 4 * I REF
Ioh = 6 * I REF
1.0V @ 50 ohm
0.7V @ 50 ohm
Voh @ Z
Board Target
Reference R,
Rr = 221 1%,
Iref = 5.00mA
Rr = 475 1%,
Iref = 2.32mA
50 ohms
50 ohms
PCI Select Functions
1
0
1.0ns
1
1
1.5ns
0
0
0ns
0
1
0.5ns
E_PCICLK1
E_PCICLK3
E_PCICLK(3,1)
*
Note:
* Approximate values
E_PCICLK3 = 10Kohm resistor.
0 = No resistor
1 = 10Kohm pull-up to V
DD.
E_PCICLK1 = 10Kohm resistor.
Frequency Select Table 2
FS4
FS3
FS2
000
001
010
011
100
101
110
111
Freqency Select
CPU, 3V66, PCI
Standard Clocking
10% Overclocking
Clocking Mode
Standard Clocking
0.3% Center Spread
Standard Clocking
0 to -0.5%, Down Spread
0.3% Center Spread
Standard Clocking
0 to - 0.75%, Down
Pwr Save Clocking
Spread Off
0.3% Center Spread
3% Overclocking
0.3% Center Spread
5% Overclocking
0.3% Center Spread
PWRSAVE# Usage Illustration
Bit4
Bit3
Bit2
Bit1
Bit0
CPU
AGP
PCI
FS4
FS3
FS2
FS1
FS0
MHz
MHz
MHz
X
X
X
0
0
XXX
XXX
XXX
X
X
X
0
1
XXX
XXX
XXX
X
X
X
1
0
XXX
XXX
XXX
XX
X
1
1
XXX
XXX
XXX
1
0
0
0
0
80.00
53.33
26.67
1
0
0
0
1
106.66
53.33
26.67
1
0
0
1
0
160.00
53.33
26.67
10
0
1
1
133.33
53.33
26.67
PWRSAVE# = '0'. as
PWRSAVE# is driven to low '0'.
The output frequencies of the
CPU, AGP and PCI clock will
smoothly switch to frequencies
indicated by FS (4:2) = 100. The
frequencies gear ratio will be kept
the same. Notice that the 48MHz
& REF frequencies will not be
changed. This function can be
used with asynchronous
AGP/PCI frequencies.
PWRSAVE# = '1'. as
PWRSAVE# is driven back to
high '1'. The output frequencies
will be driven back to the
original programmed
frequencies smoothly. Notice
that this operation will only
happen after the PWRSAVE#
has been driven to '0'. This will
not affect power up or I2C
programmed frequencies if the
PWRSAFE# has been tied to a
'1'.



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