Hardware User Guide
3-24 Xilinx Development System
Figure 3-9 Relaxation Oscillator Schematic
With the components provided, R1 = R2 = 100 kilohms and C5 = C6 =
0.1uF, the oscillator generates an output frequency of approximately
100 Hz.
The following figure shows the RC Network waveforms.
Figure 3-10 RC Network Waveforms
The formula for calculating the RC network is as follows.
T=T1+T2=N((R1C5)+(R2C6))
where:
X6127
R1
Vcc
R2
C5
C6
nameQ
name set
name reset
nameQL
CQ
OBUFT
IBUF
IBUF
OBUFT
CQL
X4715
T
T2 T1
VT
VT
Q
C5
C6
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