Digilent CoolRunner-II Довідковий посібник - Сторінка 3
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Друкувати сторінкуCoolRunner-II™ Starter Board Reference Manual
3
Clocks
The CoolRunner-II board includes a fixed-frequency oscillator that
produces an 8MHz clock signal. This primary oscillator output,
labeled PCLK in the schematic, is connected to the GCLK2 pin of the
CPLD (at P38) so that it can be routed to the internal clock divider. An
unloaded socket for a standard half-size DIP oscillator is also
provided at location IC3.
4
User I/O
The CoolRunner-II board provides two pushbuttons and two slide switches for inputs, and four red LEDs and a four-
digit LED display for outputs.
The active-low pushbuttons and slide switches include series resistance for short-circuit protection. The LEDs are
active low, and the seven-segment display uses decoupled-transistor active-high common anode signals and
active-low cathodes.
Three additional LEDs indicate USB power good (LD4), board power good (LD5), and USB link status (LD6).
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Fixed Freq
38
Oscillator
DSC1033
CoolRunner-II
Oscillator
32
Socket
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