topic Re: Flexbus for 8bit peripheral in Kinetis Microcontrollers

Flexbus for 8bit peripheral

izmile — Mon, 27 Jan 2014 17:27:38 GMT

Hi boarders,

I would like to interface a 8 bit I/O device to K60 processor using flexbus. The timing for the device is as shown in the attached picture. This is like a legacy 8 bit memory where it has separate read and write strobes along with ALE. I am not sure how interface this device to the K60 processor as the flexbus does not provide any suitable bus cycles to support this device. Appreciate any help.

Thanks,

-Ismail

Re: Flexbus for 8bit peripheral

perlam_i_au — Thu, 27 Feb 2014 16:54:44 GMT

Based on your diagram I noticed you are using a 8080 protocol from Intel (one signal to READ and other to WRITE), unfortunately FlexBus only supports 68000 protocol from Motorola (the same signal to READ and WRITE). You can try use the available signals on FlexBus to emulate the 8080 protocol but at this moment I guess there is not such thing like implementation code for it.

Have a great day,
Perla

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Re: Flexbus for 8bit peripheral

isabelbenitez — Tue, 04 Mar 2014 15:02:02 GMT

I have 8080 interface now running. I just connect the signal like this:

//FB_CS0_b (CS)

//FB_TS_b (RESET)

//FB_RW_b (WR)

//FB_OE_b (RD)

//FB_AD16 (A0)

Re: Flexbus for 8bit peripheral

perlam_i_au — Tue, 04 Mar 2014 17:35:06 GMT

Is good to know your device is working!!!

I am just curious about FB_ALE signal, are you using it?

I ask because this signal is related to the FB_TS.

Perla