3FPGA Circuits
3.5LED
DBUG353-1.06E
14(25)
3.4.3
Pins Distribution
Table 3-3 FPGA Clock and Reset Pins Distribution
Signal Name
Pin No.
BANK
Description
I/O
FPGA_CLK
6
3
50MHz crystal oscillator
Input
3.3V, 2.5V, 1.2V
F_CLK_SMA
56
2
External clock input
3.3V, 2.5V, 1.2V
FPGA_RST_N
92
1
Reset signal, active low
3.3V, 2.5V
Note
!
The VCCO1 of GW1N-4 can only be supplied with 3.3V or 2.5V, optional;
3.5
LED
3.5.1
Overview
Four green LEDs are incorporated into the development board and are
used to display the required status. In addition, two LEDs are reserved to
signify power supply and FPGA loading status.
Users can test the LEDs in the following ways:
If the output signal of related pins is logic low, LED is on;
If logic is high, LED is off.
3.5.2
LED Circuit
Figure 3-4 LED Circuit
D3
47
D4
57
D5
60
D6
61
VCCO2
F_LED1
F_LED2
F_LED3
F_LED4
U6
3.5.3
Pins Distribution
Table 3-4 LED Pins Distribution
Signal Name
Pin No.
BANK
Description
I/O
F_LED1
47
2
LED1
3.3V, 2.5V, 1.2V