SDRAM ON STM32F439I-EVAL2

[stdavod]

Posted on October 15, 2014 at 14:54

Hi

I try find datasheet SDRAM on this board but I can't find it.

I want Row Address Input and Column Address Input .

please help me.

#lmgtfy

[Tesla DeLorean]

Posted on October 15, 2014 at 16:57

http://www.micron.com/~/media/Documents/Products/Data%20Sheet/DRAM/64mb_x32_sdram.pdf

[stdavod]

Posted on October 15, 2014 at 17:58

MT48LC2M32B2 is 2 Meg x 32 (512K x 32 x 4 banks)

but my board is 8 M x 32-bit SDRAM (page 6 from DM00093454.pdf)

where is different?

[Tesla DeLorean]

Posted on October 15, 2014 at 18:24

This is an 8MByte part, externally marked as D9GZQ on my early STM324x9I-EVAL

If you have a different part you'll need to express what markings you see on it, as I can't determine this through osmosis.

[Tesla DeLorean]

Posted on October 15, 2014 at 18:31

From the

http://www.st.com/web/en/catalog/tools/PF259094#

http://www.issi.com/WW/pdf/42-45S32800G.pdf

http://www.micron.com/parts/nor-flash/parallel-nor-flash/m29w128gl70za6e

[waclawek.jan]

Posted on October 15, 2014 at 18:41

UM1668 on the schematics states MT48LC4M32B2 which is 1 Meg x 32 x 4 Banks.

What a mess.

JW

[Montassar BEN ROMDHANE_O]

Posted on October 16, 2014 at 10:16

It seems that is a typo error in Eval board user Spec (DM00093454.pdf), the correct information should be 8Mbytes SDRAM, 2Meg x 32-Bits.

Regards,

Heisenberg.

[stdavod]

Posted on October 16, 2014 at 12:17

For Initialize the SDRAM controller .

What

gpios

should

I use?

What

registers

should

I use?

which pins on IS42S32800G connect to which gpios on stm32f439 microcontroller?

please help me.

[waclawek.jan]

Posted on October 16, 2014 at 12:52

Follow the schematics in UM1668.

Tables 25 and 26 (the layout of memory connectors CN11 and CN12) may help too.

JW

[stdavod]

Posted on October 16, 2014 at 13:40

With

my own

eyes

I

saw

the

writing

on the

board

(IS42S32800G =8M x 32bit=2Meg฀ x฀ 32฀ bit฀ x฀ 4฀Banks)

but page 45 on DM00093454.pdf is for MT48LC4M32B2B5-7.

now what can we do?

[waclawek.jan]

Posted on October 16, 2014 at 14:33

SDRAMs are pin- and function- compatible to a great extent.

The only difference between the 2Mx32 and 8Mx32 chip (except the timing, a.k.a. ''latencies'', of course) is the addressing: while MT48LC2M32B2 uses A10:A0/A7:A0 for row/column addressing, IS42S32800G uses A11:A0/A8:A0.

This should be reflected in the programming of FMC, but I am no expert on that (a quick glance into RM0090: NC and NR fields in FMC_SDCRx register should do the trick).

JW