imx6 eim muxed 16bits communication

magang — Mon, 01 Jun 2015 05:56:34 GMT

Hello

I'm trying to communicate the with a fpga chip over the EIM bus on an i.MX6.

It uses the following signals:

CS0

LBA

EB0/EB1

ADDR/DATA[0-15]

It doesn't have the WAIT pin connected and uses a external chip to latch addresses.

My configuration:

EIM_CS0GCR1: 0x07f1003f

EIM_CS0GCR2: 0x00001002

EIM_CS0RCR1: 0x08785000

EIM_CS0RCR2: 0x00000028

EIM_CS0WCR1: 0x88e28800

EIM_CS0WCR2: 0x00000000

at uboot

when i use md 0x08000000，then

then value is 0xffffffff

use mw.l 0x08000000 0x1223 8

then md 0x08000000 then value still is 0xffffffff

anyone can help me

Re: imx6 eim muxed 16bits communication

Yuri — Tue, 02 Jun 2015 06:03:00 GMT

Please look at my comments regarding Your EIM configuration.

EIM_CS0GCR1[AUS] = 1 (Address unshifted)

Does it correspond Your scheme ?

2.
EIM_CS0GCR1[BCD] = 00 Divide EIM clock by 1

The EIM clock should less than 104 MHz.

Please check it.

Also, it makes sense to look at waveforms of EIM signals.

Have a great day,
Yuri

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imx6 eim muxed 16bits communication

Re: imx6 eim muxed 16bits communication