MPC5xxxのトピックProblem facing while working with SRAM.

Problem facing while working with SRAM.

ravitejaveeraga — Sun, 29 May 2016 15:41:44 GMT

I am working on SRAM using EBI communication. I am trying to write a bunch(1kilo bytes) of data to it. In that whole data write, two to three bytes of data is failing to write. As this is a parallel communication, i am unable to track the communication. I want to know, what are the major issue's we may face while working with EBI. And also i didnt understood nonmultiplex/multiplex mode. Did any having the data which explains this.

Re: Problem facing while working with SRAM.

davidtosenovjan — Mon, 30 May 2016 06:37:25 GMT

Please clarify used MCU and whether you are using EVB or your own prototype board. Also I would to know used configuration and detailed description of the issue. Thanks

Re: Problem facing while working with SRAM.

ameyaranade — Mon, 30 May 2016 06:52:38 GMT

Multiplexed and Non-Multiplexed modes have to do with the total number of pins used for the interface. In Non-multiplexed mode Data and Address have dedicated pins.

In multiplexed mode the address is driven on the data pins during the address Phase hence lesser number of pins are required.

This Application note might help you understand better: http://www.nxp.com/files/32bit/doc/app_note/AN3854.pdf

Re: Problem facing while working with SRAM.

ravitejaveeraga — Mon, 30 May 2016 08:46:52 GMT

1) MCU is MPC5777C.

2) Using my own prototype board.

MCR = 0x00000801

BMCR = 0x0000FF80

I followed this configuration.

And below are the some of the configuration.

MCR = 0x00000801

BMCR = 0x0000FF80

Re: Problem facing while working with SRAM.

davidtosenovjan — Fri, 03 Jun 2016 11:52:49 GMT

Could I see scheme of connection? Could I see piece of code using for EBI access? Have you tried to play with timing setup? Do you have more pieces of your prototype board? Still same issue?