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Intel
®
820E Chipset
R
176 Design Guide
4.9.2. DRCG+ Frequency Selection Schematic
The DRCG+ frequency can be selected using two GPIOs connected to the MULT[0:1] pins, as shown in
the following figure. This allows selection of all frequencies supported by the Intel 820E chipset.
Figure 96. DRCG+ Frequency Selection
drcg+freq_sel
REFCLK
PWRD#
STOPB#
MULTO
MULT1
S0
S1
GND
PCLKM
SYNCLKN
NC
2
12
11
15
14
24
23
13
6
7
19
GPO1
GPO2
17
21
4
8
5
GNDO1
GNDO2
GNDP
GNDC
GNDI
CLK
CLKB#
20
18
1
10
16
22
3
9
VDDIR
VDDIPD
VDDO1
VDDO2
VDDP
VDDC
U?
DRCG