ICS94215 Datasheet, PDF (1/18 Pages) Integrated Circuit Systems – Programmable System Clock Chip for AMD - K7™ Processor

Integrated
Circuit
Systems, Inc.
ICS94215
Programmable System Clock Chip for AMD - K7™ Processor
Recommended Application:
VIA KX/KT133 style chipset
Output Features:
• 1 - Differential pair open drain CPU clocks
• 1 - CPU clock @ 3.3V
• 13 - SDRAM @ 3.3V
• 6 - PCI @3.3V,
• 1 - 48MHz, @3.3V fixed.
• 1 - 24/48MHz @ 3.3V
• 2 - REF @3.3V, 14.318MHz.
Features:
• Programmable ouput frequency.
• Programmable ouput rise/fall time.
• Programmable PCI_F and PCICLK skew.
• Spread spectrum for EMI control typically
by 7dB to 8dB,
with programmable spread percentage.
• Watchdog timer technology to reset system
if over-clocking causes malfunction.
• Uses external 14.318MHz crystal.
• FS pins for frequency select
Pin Configuration
VDD1
1
REF0/CPU_STOP#*
2
GND
3
X1
4
X2
5
VDD2
6
*MODE/PCICLK_F
7
*FS3/PCICLK0
8
GND
9
*SEL24_48#/PCICLK1
10
PCICLK2
11
PCICLK3
12
PCICLK4
13
VDD2
14
BUFFER IN
15
GND
16
SDRAM11
17
SDRAM10
18
VDD3
19
SDRAM9
20
SDRAM8
21
GND
22
SDATA
23
SCLK
24
48
REF1/FS2*
47
GND
46
CPUCLK
45
GND
44
CPUCLKC0
43
CPUCLKT0
42
VDDCPU
41
PD#*
40
SDRAM_OUT
39
GND
38
SDRAM0
37
SDRAM1
36
VDD3
35
SDRAM2
34
SDRAM3
33
GND
32
SDRAM4
31
SDRAM5
30
VDD3
29
SDRAM6
28
SDRAM7
27
VDD4
26
48MHz/FS0*
25
24/48MHz/FS1*
48-Pin 300mil SSOP
* Internal Pull-up Resistor of 120K to VDD
Block Diagram
PLL2
X1
XTAL
X2
OSC
PLL1
Spread
Spectrum
SEL24_48#
SDATA
SCLK
FS (3:0)
PD#
CPU_STOP#
BUFFER IN
0442C—07/03/02
Control
Logic
Config.
Reg.
/2
CPU
DIVDER
Stop
PCI
DIVDER
SDRAM
DRIVER
48MHz
24_48MHz
REF (1:0)
CPUCLK
CPUCLKC0
CPUCLKT0
PCICLK (4:0)
PCICLK_F
SDRAM (11:0)
SDRAM_OUT
Functionality
FS3 FS2 FS1 FS0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
CPU
(MHz)
90.00
95.00
101.00
102.00
100.90
103.00
105.00
100.00
107.00
109.00
110.00
111.00
113.00
115.00
117.00
133.30
PCICLK
(MHz)
30.00
31.67
33.67
34.00
33.57
34.33
35.00
33.33
35.67
36.33
36.67
37.00
37.67
38.33
39.00
33.33