Clock Circuitry; General User Input / Output - Arrow BeMicro CV A9 Hardware Reference Manual

Clock Circuitry

The development board includes two oscillators with frequencies of 24 MHz and 50 MHz.
Table 2–2
board.
Board
Reference
Y1
Y2
Note 1: I/O voltage for this interface is selectable using the VCCIO_SEL jumper

General User Input / Output

The development board includes switches for user input and LEDs for status output. This
section describes these elements.
LED Outputs
There are multiple LED indicators on the board, but only LED1-LED8 are available for use
through FPGA I/O. Driving the FPGA output to a logic 0 will illuminate the LED. Driving a
logic 1 turns it off.
functional descriptions.
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Figure 2-3: Active Serial x4 Configuration Interface
lists the oscillators, their I/O standard, and voltages required for the development
Table 2-2: BeMico CV On-board oscillators
Schematic Signal
Name
DDR3_CLK_50MHZ 50 MHz
CLK_24MHZ
Table 2–3 lists the LED board references, schematic signal names, and
Frequency I/O
Standard
1.8V
24 MHz 2.5V or
1
3.3V
10
FPGA Pin Application
Number
H13 DDR3 HMC Clock Input
M9 General Purpose Clock
Input, also used by
on-board USB Blaster II