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1) Do I need to connect the oscillator to all 4 pins? The development board's schematic shows the oscillator being only connected to one pin.
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To one clk pin is fine.
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2) What's the best way to send this clock source to the next PCB? LVDS I presume? I'm gonna go with a oscillator of 8 MHz or so.
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You don't. Each CPLD synchronizes the serial data to its own clock domain. The I/Os would update on the rising-edge of the shift clock, as detected in the synchronized domain (within a couple of clocks of each oscillator), or you can use the serial clock to update it.
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3) Is it better to go with an oscillator or a crystal?
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I always use oscillators, since they 'just work'.
Cheers,
Dave
Honored Contributor
