DE2-115 Datasheet, PDF (39/116 Pages) Altera Corporation – The DE2-115 package contains all components needed to use the DE2-115 board in conjunction with a computer that runs the Microsoft Windows OS.

HEX7[2]
HEX7[3]
HEX7[4]
HEX7[5]
HEX7[6]
PIN_AG17
PIN_AH17
PIN_AF17
PIN_AG18
PIN_AA14
Seven Segment Digit 7[2]
Seven Segment Digit 7[3]
Seven Segment Digit 7[4]
Seven Segment Digit 7[5]
Seven Segment Digit 7[6]
Depending on JP6
Depending on JP6
Depending on JP6
Depending on JP6
3.3V
4.5 Clock Circuitry
The DE2-115 board includes one oscillator that produces 50 MHz clock signal. A clock buffer is
used to distribute 50 MHz clock signal with low jitter to FPGA. The distributing clock signals are
connected to the FPGA that are used for clocking the user logic. The board also includes two SMA
connectors which can be used to connect an external clock source to the board or to drive a clock
signal out through the SMA connector. In addition, all these clock inputs are connected to the phase
locked loops (PLL) clock input pins of the FPGA to allow users to use these clocks as a source
clock for the PLL circuit.
The clock distribution on the DE2-115 board is shown in Figure 4-11. The associated pin
assignments for clock inputs to FPGA I/O pins are listed in Table 4-5.
Signal Name
CLOCK_50
CLOCK2_50
CLOCK3_50
SMA_CLKOUT
SMA_CLKIN
Figure 4-11 Block diagram of the clock distribution
Table 4-5
FPGA Pin No.
PIN_Y2
PIN_AG14
PIN_AG15
PIN_AE23
PIN_AH14
Pin Assignments for Clock Inputs
Description
50 MHz clock input
50 MHz clock input
50 MHz clock input
External (SMA) clock output
External (SMA) clock input
I/O Standard
3.3V
3.3V
Depending on JP6
Depending on JP6
3.3V
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