W83193R-02 Datasheet, PDF (5/18 Pages) Winbond – 83.3 MHZ 3-DIMM CLOCK

Preliminary W83193R-02/-04/-04A
6.0 FREQUENCY SELECTION
W83193R-02/-04 Frequency Table
FS2
FS1
FS0
CPU, SDRAM (MHz)
0
0
0
50
0
0
1
75
0
1
0
83.3
0
1
1
68.5
1
0
0
83.3
1
0
1
75
1
1
0
60
1
1
1
66.8
PCI (MHz)
25
32
41.65
34.25
33.3
37.5
30
33.4
REF, IOAPIC (MHz)
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
W83193R-04A Frequency Table
FS2
FS1
FS0
CPU, SDRAM (MHz)
0
0
0
50
0
0
1
100
0
1
0
83.3
0
1
1
68.5
1
0
0
90
1
0
1
75
1
1
0
112
1
1
1
66.8
PCI (MHz)
25
50
41.65
34.25
45
37.5
56
33.4
REF, IOAPIC (MHz)
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
7.0 CPU 3.3#_2.5 BUFFER SELECTION
CPU 3.3#_2.5 (PIN 2) INPUT LEVEL
1
0
CPU & IOAPIC OPERATE AT
VDD = 2.5V
VDD = 3.3V
8.0 FUNCTIONAL DESCRIPTION
8.1 Power Management Functions
All clocks can be individually enabled or disabled via the 2-wire control interface. On power up,
external circuitry should allow 3 ms for the VCO to stabilize prior to enabling clock outputs to assure
correct pulse widths. When MODE = 0, pins 15 and 46 are inputs (PCI_STOP#), (CPU_STOP#),
when MODE = 1, these functions are not available. A particular clock could be enabled as both the 2-
wire serial control interface and one of these pins indicate that it should be enable.
Publication Release Date: April 1999
-5-
Revision A1