DIY evaluation board with XE216-512-TQ512

XCore Project reviews, ideas, videos and proposals.
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eez-open
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DIY evaluation board with XE216-512-TQ512

Postby eez-open » Sat Dec 30, 2017 12:32 pm

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Postby eez-open » Sat Dec 30, 2017 1:21 pm

Hm, serial interface for daisy chained 8-bit shift registers will require three instead of mentioned two pins (i.e. CLK, DATA, LATCH/STROBE) and its clock frequency probably should be much higher then what I said before. I have to investigate that further and for beginning find out what screen refresh rate is optimal.

EDIT: 2-wire xCONNECT Link to the xSYS header pins are wrongly assigned in the table from previous post. It should be X0D40 ... X0D43 instead of X0D39 ... X0D42.
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Postby eez-open » Thu Jan 04, 2018 5:02 pm

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Postby eez-open » Sun Jan 07, 2018 10:25 am

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Postby eez-open » Tue Jan 09, 2018 1:40 pm

I've finished a first version of the PCB for this project. PCB is 4-layer, the simplest one (only thru-hole vias) with dimension 100 x 85 mm that is within limits of cheap Chinese prototyping manufacturers. Top and bottom layers rendered with OSHpark are shown below (inner layers were used for GND and power). On the bottom side are placed only micro SD card socket (J2) and optional 20-pin Riverdi LCD socket (X5). Passive components are rather large: 0805 and 0603 but it should be easier to works with them. When design become completed I'll publish all files (PCB files, Gerbers, BOM) on the GitHub.

Image

Image
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Postby eez-open » Thu Jan 11, 2018 2:49 pm

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mon2
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Postby mon2 » Fri Jan 12, 2018 6:47 pm

Have you considered the XMOS created part that is stock from Digikey? This variation of the Si5351A PLL is factory programmed to offer 3 output clocks including 24 Mhz. You will need to review that if you do alter any of the clocks during runtime over I2C interface that the CPU clock (if driven by this PLL) is not interrupted else you will have a potential crash.

https://www.silabs.com/internal-apps-ma ... dendum.pdf

offers the details of the clock upon power up. Used on some XMOS boards.

https://www.digikey.com/product-detail/ ... ND/5799560
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Postby eez-open » Sat Jan 13, 2018 5:46 pm

Thanks, that looks promising, but I think that I can live in this moment with two XCO that cost me a little bit above 0.8 € on qty of 2. I've checked so far all physical dimensions of all components that needs to be created in Eagle, and only MCU is missing, but its on the way from Farnell, I expect it next week. I bought two XTAG, too. I made also few corrections on PCB, e.g. micro SD Card socket was rotated for 180 degrees :).
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Postby mon2 » Sat Jan 13, 2018 7:04 pm

The most popular footprint for oscillators is the 3225 footprint. Such parts are typically under $ 0.40 USD in 1k qty on T&R from Asia. Source: WTL (Shenzhen, CN).

Can share some more comments after our lunch...
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Postby SpacedCowboy » Sat Jan 20, 2018 6:08 pm

I don't suppose you have an updated schematic do you ? There's a lot I'd like to (ahem) lift from this :)

Cheers
Simon

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