Kinetis MicrocontrollersのトピックRe: Using Flexbus with K10 with 100 pin package

Using Flexbus with K10 with 100 pin package

dporada — Fri, 10 Jan 2014 16:29:40 GMT

Hello everyone. The 100 pin package does not have all 32 pins of the buss on the Flexbus. I have a project with 8megs of external ram connected to the flex bus. The RAM chip has a 16 bit bus and I have a 16 bit latch on the lower 16 bits of the Flexbus.

As far as I can tell, the signals look OK for a write, but when I try to read, I get the latch signal, R/W signal, and CE signal, but not the OE signal. It always stays high. As far as I can tell, it was enabled by processor expert when I look at the PE code.

I also tried changing the OE pin to a generic IO pin and I am able to toggle the pin in software, so the pin is not shorted.

Anybody have any suggestions?

Re: Using Flexbus with K10 with 100 pin package

Kan_Li — Mon, 13 Jan 2014 08:38:52 GMT

Would you please show a snapshot of the connection between the external RAM and K10? and what is the part number for K10 that you are using?

Thanks for your patience!!

Re: Using Flexbus with K10 with 100 pin package

dporada — Mon, 13 Jan 2014 14:10:21 GMT

Here's a partial schematic. The chip is a MK10DN512VLL10. There is an error in the schematic. Pin 82 of the CPU should be connected to FB_AD5.

Re: Using Flexbus with K10 with 100 pin package

Kan_Li — Tue, 14 Jan 2014 02:40:25 GMT

The schematics looks fine, was PTB19 initiliazed to another mux function in your code? You may add some code snippet for read operation immediately after the code of flexbus initialization, and check if FB_OE works well as expected.

Hope that helps,

B.R

Kan

Re: Using Flexbus with K10 with 100 pin package

dporada — Mon, 27 Jan 2014 14:23:34 GMT

I don't know what caused the problem, but creating a new project seemed to work.