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3 Development Board Circuit
3.4 Clock, Reset
DBUG401-1.0E
13(22)
3.3.1
Pinout
Table 3-2 FPGA Power Pinout
Signal Name
Pin No.
BANK
Description
I/O
VCCO0
1
0
I/O Bank Power
1.8V/3.3V
VCCO1
25
1
I/O Bank Power
2.5V
VCCO2
13
2
I/O Bank Power
1.2V/2.5V
VCCO3
1
3
I/O Bank Power
1.8V/3.3V
VCCX
8, 36
-
Auxiliary voltage
1.8/3.3V
VCC
12, 37
-
Core voltage
1.2V
VSS
2, 26
-
GND
-
3.4
Clock, Reset
3.4.1
Overview
A 50MHz crystal oscillator is provided in the development board that
connects to the PLL input pin. This can be employed as the input clock for
the PLL in FPGA, and the output clock as needed via multiplication and
division of the PLL frequency.
3.4.2
Clock, Reset
Figure 3-3 Clock, Reset
35
14
KEY3
50MHz
ADM811
3.3V
FPGA_RST_N
FPGA_CLK
U1
U2
X2
GW1NSR-
LX2CQN48PC5I4_V2.1
3.4.3
Pinout
Table 3-3 FPGA Clock and Reset Pinout
Signal Name
Pin No.
BANK
Description
I/O
FPGA_CLK
35
1
50MHz crystal oscillator Input
2.5V
FPGA_RST_N
34
1
Reset signal, active low
2.5V