[En-Nut-Discussion] Ethernut 3 hardware points: RAM on expansion port and SD card
uprinz2 at netscape.net
Sun Aug 2 17:50:03 CEST 2009
I had used the external RAM on Ethernut 3.0e and other SAM7 based
Applications without any problem. Just keep an eye on timing and correct
The power-glitch while handling any hotswap device is a problem that can
be worked around by installing a 100nf and a 1uF capacitor as close as
possible to the vcc/gnd of the socket. This is a workaround as the real
solution should be to design in a slot controller. I.e. a chip that does
bus connection/disconnection including power up / power down of the cards.
Best regards, Ulrich
Colin Chaballier wrote:
> As part of the integration of the Ethernut3 in a new design, I'm looking
> at the feasibility to add external RAM through the expansion connector.
> Do you have any feedback experience on connecting RAM through the
> "configurable address bus" on this board ?
> Apart the 16bit address bus limitation, should be there any issues
> working on the address/data buses through the CPLD logic (latency
> control for example) ?
> My second point is about the SD Card support. In the Ethernut3
> documentation it is reported that there should be a power line glitch
> problem when inserting SD card of more than 2GB. Is this problem has
> been definitely solved ? Or could we expect later issues when using
> large capacity SD cards ?
> Thanks for your answers.
> Best regards,
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