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(2) Changing the Internal Oscillator Circuit of Emulation Pod
An oscillator circuit board (OSC-3) for 20 MHz is mounted on this product. To use the emulation pod
at a frequency other than 20 MHz, build the desired oscillator circuit on the included OSC-2 oscillator
circuit board (bare board) and replace the board installed in the emulation pod when shipped from
the factory.
Figure 3.5 shows a view of the OSC-2 oscillator circuit board (bare board) and where connector pins
are located. Figure 3.6 shows the circuitry of the OSC-2 oscillator circuit board (bare board). Use the
number of oscillator circuits recommended by the oscillator manufacturer.
Figure 3.5 External view of oscillator board (OSC-2) and connector pin assignment
IC1
11
10
R1
*
*
X1 ,X 2
C2
*
X3
* X1: 5.08-mm-pitch 2-pin oscillator
*
X2: 2.54-mm-pitch 2-pin oscillator
*
X3: 2.54-mm-pitch 3-pin oscillator
Figure 3.6 Circuit of oscillator board (OSC-2)
IC1
9
8
1
2
R2
3
4
5
6
C1
13
12
IC1
( 31 / 74 )
J1-4: GND
J1-3: Oscillator output
J1-2: GND
J1-1: Vcc
CLK
Vcc
14
C3
IC1
7
GND
GND
IC1: Inverter (Unbuffer)
J1-3
J1-1
J1-2
J1-4
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