hi,
i want to connect two XS1-L1 devices in a chain.
I plan to use a 25MHz oscillator (for 2 x XS1-L1 + LAN8700) with a standard load of 15pF.
Is an extra buffer (like the 74LVC841A in the XMOS XMP-64A schematic) required for the 25Mhz system clock (for this 3 devices) and the JTag clock (2 devices) ??
Greetings
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Buffer or no buffer that's the question..
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Well it will all work without buffers but generally its a good idea to buffer system clocks to reduce jitter and such (PLL will multiply that jitter in to a even bigger jitter on the cpu clock)
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We would recommend that you buffer them (e.g. with a NC7NZ34) and then series terminate the outputs.
Cheers,
Corin
Cheers,
Corin
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