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PICList Thread
'How to connect PIC to DRAM (esp. SIMM)'
1997\10\05@183359 by Evgeni Nikolov

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Hi All,

In my current project I have to strore a big amount of information (about
256-512K). I'm waiting for any ideas.

Evgeni

1997\10\05@184021 by Pierce Nichols

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On Mon, 6 Oct 1997, Evgeni Nikolov wrote:

> In my current project I have to strore a big amount of information (about
>  256-512K). I'm waiting for any ideas.

       Flash.

       Pierce Nichols

1997\10\05@185647 by Evgeni Nikolov

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part 0 209 bytes
>> In my current project I have to strore a big amount of information (about
>>  256-512K). I'm waiting for any ideas.

>        Flash.

I'm more programmer, so please recommend me one.

Evgeni

1997\10\05@191548 by Scott Newell

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Hey.

>In my current project I have to strore a big amount of information (about
> 256-512K). I'm waiting for any ideas.

I interfaced a 16c74 to a 256k 30 pin simm.  Nothing really tricky about
it.  Used a timer interrupt to generate refresh cycles, and a bunch of I/O
pins to drive the busses and control signals.

I downloaded the datasheets for the dram chips on the simm to get the
timing right.   I think the Fujitsu docs had a pretty good description.


later,
newell

1997\10\05@191553 by Pierce Nichols

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On Mon, 6 Oct 1997, Evgeni Nikolov wrote:

> I'm more programmer, so please recommend me one.
>

       As in flash memory chips -- they come in the appropriate size, and
aren't any harder to do, from a coding standpoint, then EEPROMs.

       Pierce Nichols

1997\10\05@191803 by Bill Von Novak

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At 01:52 AM 10/6/97 +0200, you wrote:

>>> In my current project I have to strore a big amount of information (about
>>>  256-512K). I'm waiting for any ideas.
>
>>        Flash.
>
>I'm more programmer, so please recommend me one.

       the Am29F400AT from AMD might be a good choice.  it's a 512K by 8 bit
part, 5V-only operation.  AMD has parts all the way up to 2 meg by 8 bit.

-bill von

1997\10\05@225625 by Ram Krishnan

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try the Nexcom NX25F080AT-16C5-R1  Serial Flash.
Nexcom is at SunnyVale, CA (408 730 3690)

You'll need a minimum of ports - serial flash is easy

1997\10\06@002016 by William Chops Westfield

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   >>> In my current project I have to strore a big amount of information
   >>>   (about 256-512K). I'm waiting for any ideas.
   >
   >>        Flash.
   >
   >I'm more programmer, so please recommend me one.


Atmel has flash with a serial interface ("Serial dataflash".)  I think it
comes in 2, 4, and 8 Mbit (256k, 512k 1M.)  See their website.

BillW

1997\10\06@023433 by Pasi T Mustalahti

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On Mon, 6 Oct 1997, Evgeni Nikolov wrote:

> Hi All,
>
> In my current project I have to strore a big amount of information (about
>  256-512K). I'm waiting for any ideas.
>
PTM: DRAM needs power. It is not a very good selection in a small power
system. Use SRAM instead It costs more and needs bigger box, but it is
much more simple and runs out of a small battery for hours or even days.
If it shoud run for weeks, use FLASH.

If you use mains voltage, I'll recommend a PC. Old PC's are lying there
around for nothing. We have used them because the programs can be written
much more freely. Data I/O can be made either thru LPT or RS232-port or a
8255-card. You can not beat the price of an old 4.77 PC ;)
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1997\10\07@082705 by Evgeni Nikolov

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part 0 585 bytes
> try the Nexcom NX25F080AT-16C5-R1  Serial Flash.
> Nexcom is at SunnyVale, CA (408 730 3690)

> You'll need a minimum of ports - serial flash is easy

I want thank All of you for your suggestions about storing a big amount of information. Someone suggested to use a XT's mainboard - well,  it is acceptable, but I have space limitations - the device should be as smaller as it is possible.

I have another question - can you tell me what are the prices of these FLASH roms - about 512k - 1M in your countries. I would like to compare them with these in Bulgaria.

Evgeni


1997\10\07@103734 by Emil Kovatchev

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Evgeni Nikolov wrote:
>
> Hi All,
>
> > try the Nexcom NX25F080AT-16C5-R1  Serial Flash.
> > Nexcom is at SunnyVale, CA (408 730 3690)
>
> > You'll need a minimum of ports - serial flash is easy
>
> I want thank All of you for your suggestions about storing a big amount of
information. Someone suggested to use a XT's mainboard - well,  it is
acceptable, but I have space limitations - the device should be as smaller as
it is possible.
>
> I have another question - can you tell me what are the prices of these FLASH
roms - about 512k - 1M in your countries. I would like to compare them with
these in Bulgaria.
>
> Evgeni
>
>     ---------------------------------------------------------------
>
>                 Part 1.2       Type: application/ms-tnef
>                            Encoding: base64
Hi, Evgeni!

Stiga si se ebaval s ceni na Flash pameti w Balgaria i w drugite strani
i drugi takiwa gluposti. Polzvaj saveta na onzi pitch, deto ti predlaga
da opravisch neststa s 30 pin RAM modul ot star komputar-taka ste ti
izleze naj evtino i barzo. ( By the way, kade si vizdal ti vaobste Flash
memories v Balgaria, tsche i cenite im da sravnjavasch?

1997\10\07@172056 by Evgeni Nikolov

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part 0 1563 bytes
> Hi, Evgeni!

> Stiga si se ebaval s ceni na Flash pameti w Balgaria i w drugite strani
> i drugi takiwa gluposti. Polzvaj saveta na onzi pitch, deto ti predlaga
> da opravisch neststa s 30 pin RAM modul ot star komputar-taka ste ti
> izleze naj evtino i barzo. ( By the way, kade si vizdal ti vaobste Flash
     > memories v Balgaria, tsche i cenite im da sravnjavasch?


 Since I thing that all other guyes don't understand bulgarian language, I want to excuse myself that I'll answer both in English and Bulgarian.

So the question from Emil was if I ever saw FLASH memories in Bulgaria.

Well, in Sofia there is a company - Comet electronics. They made me an offer  to deliver any component that I need if it is presented in Farnell's catalogue. And also next months I'll travel a lot along Europe (electronics is my hobby - I work in Deloytte & Touche as a programmer and IT consultant), so I hope I'll be able to purchase FLASH memories >from Germany or England.

Shto da se ebavam be. Ne znam dali jiveesh v Sofia, ama tuka az se seshtam za pone dve firmi deto sa saglasni i lunen prah da mi dostaviat ako si platia. S DHL ne e chak tolkoz skupo. Kolkoto do PC-to - ne stava. Ustroistvoto deto go pravia, triabva da ne e po-goliamo ot kibritena kutiia. E, viarno che moia PSION e s takiva razmeri i otgovaria na vsichki iziskvania (i FLASH memory si ima, i RS232 si ima, che i 200 USD struva), ama ne za tova govoria. Na vuprosa dali sum vijdal FLASH memories v Bulgaria - da, v moia kompiutur BIOS-a e na FLASH:-)

Evgeni




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