Nano54415 On-board micro-sd?

[pevans]

I have just received the Nano54415 Dev board (carrier board rev:1.1, no idea on rev of Nano board).

I am working on ideas reducing an existing Mod5270 design we have been using with SD card, using the Nano54415. While looking at the Nano board, I noticed pads for a microSD card on the backside, which opened up some questions.

1. Will the Nano be sold with a micro-sd slot on it's back?

2. Are these micro-sd pads connected to the 54415 the same as the carrier board's micro-sd is connected?

[pbreed]

Short answer is no it uses different pins...
In a high enough volume one could get that connector stuffed, it adds a lot of cost because it becomes a two sided assembly rather than single sided.

The present drivers don't work with that slot as its wired for SDHC controller not SPI and our present SD card drivers are SPI....


Both SPI and SDHC come out the same pins... alas the SDCH tx/rx are swapped with respect to spi TX/RX so the wireing needs to be different for SPI mode vs SDHC mode.

[d9_]

Last port dated by Sep 22, 2012. So, any progress on SDHC driver at all?

Also, Nano54415 have a few more pads on second side - looks like some crystal marked Y3, some U2, a few capacitors and 6 pads. Those 6 pins is a JTAG? Other components required for on-board SDHC?

[mbrown]

There has not been any recent development of an SDHC driver for the mcf5441x platform for Netburner. It is on the list of projects to be done, but an eventual development date is unknown.

The Y3 crystal and the two capacitors on the opposite side of the board are non-populated spots for a 32KHz crystal for the RTC and 22pF caps on either end. The 6 unmarked pads are not JTAG, they're initial bring up points to load the monitor onto the device during manufacturing.

[d9_]

Got it. Thank you.