SDRAM
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Hi,
I'm building a very low cost PC Oscilloscope. I have lots of spare
PC-100 SDRAM chips and would like to use them instead of buying FIFO.
I cannot use the computers memory via PCI because the PCI card cannot
guarantee memory access all the time. Therefore I would like to use
SDRAM in my...
I'm writing a new bios for an x86 processor
with an integral SDRAM controller. I have
it working with the SDRAM, but I'm troubled
by a specification in the SDRAM datasheet that
requires a precharge of all banks to be issued
upon powerup.
As far as I can see, there is no way to run
a specif...
rezaul - 2009-07-03 10:37:00
Hi
I am using a Kingston SDRAM 512MB for my virtex 2 pro development system.
I am working on image filtering where i have to send the image file to
SDRAM from my PC. I am struck off in the following two steps:
1. How can I send the image file to the SDRAM. I can send some data values
to SDRAM b...
2006-06-18 21:13:00
Hi all,
I'm designing an FPGA based board. I needed to add DDR-SDRAM. Is there
a way to interface the SDRAM to the FPGA other than develop/buy a
controller to put inside the FPGA? I mean: are there external DDR-SDRAM
controllers?
Cheers
...
kalyanamsaritha - 2008-09-16 19:45:00
Could someone explain how I would go about determining if a particular SDR
SDRAM (not DDR) is compatible with a CPU, AT91SAM9260 for example.
The cpu's Master Clock (MCK) runs at 100MHz which is the speed at which
the SDRAM controller clock (SDCK) also runs.
Does this automatically mean I sh...
Matej755 - 2008-11-06 08:52:00
Hi,
my design "sample board" is connecting LPC2470 via 32 bit bus SRAM and
SDRAM memory. SRAM works very well but SDRAM does not work. I use 2 devices
WINBOND W9816G6IH, 512Kx2Banksx16bits. I need urgenly help somebody... how
to setting EMC and init SDRAM to start works. SDRAM gets eror reading d...
I am using the s3c4510b mcu, is it necessary to initialize the SDRAM in
the bootup sequence or I can use the SDRAM directly after I set the
special registers?
If initialization of the SDRAM is required, what is the typical
sequence like in assembly?
Thanks!
...
Lucky443 - 2009-09-05 03:14:00
Hello,
I am lucky, i am working with KMC board with NEC vr4131 processor and
samsung K4S561632C SDRAM. my processor have an inbuilt SDRAM control
unit.
When we are initializaing the sdram, we have to follow the sequence(200us
NOP, Precharge, 2xAuto Refresh and MRS) or initializaing the sdra...
KBG - 2006-10-10 04:50:00
Hi,
According to the MCF5272 datasheet, and the schematic, the address
line A22 and A23 of ColdFire are to be treated as SDBA0 and SDBA1 and
connected to BA0 and BA1 of the SDRAM respectively. But when the
register value is set according to the above, the SDRAM initialisation
faces problem.
...
Reiner - 2006-10-30 07:38:00
Hi,
We build own at91 board with an AT45DB642 and 64MB of SDRam.
Above I'll describe some details.
At45DB642 is attached to at91rm9200 on CS0 and SDRam is using a 32bits
of data path.
We already tested both, and they are working without any kind of
problem. We wrote data on At45DB642 and ...
Franco - 2007-01-12 02:11:00
I need some help to configure my mxL freescale arm9, to work with
K4M283233H-HN75 sdram.
My system works, but probably with a bad sdram setting.
I'm looking for some experience or documentation that could
help me to tune my blob memory setting.
Thanks
...
MaheshS - 2005-11-28 07:45:00
Hi,
Can anyone explain why the address line A14 from AT91RM9200 is connected
to NC pin of SDRAM (MT48LC8M16A2)? (reference: AT91RM9200ek-userguide,
SDRAM interface section)
Thanks
S Mahesh.
...
2008-02-17 17:00:00
Hi,
We have an Infineon TC1100 processor connected to a 4Mx32 SDRAM (Micro
Mt48LC4M32B2).
Examining the memory signals with a logic analyser, the SDRAM is being
correctly written, refreshed and read.
However, although we can see the expected data being output on a read
command, the data d...
Mark - 2006-10-25 20:10:00
I was hoping to only spend $1 to $2 for 32k SRAM (or SDRAM) to
interface with the AT91SAM9260. Looking at the schematic for the
AT91SAM9260 evaluation board, I can see it uses two Micron
MT48LC16M16A2 32KB SDRAM chips. Looking on digikey.com and avnet.com,
this chip is about $7 in quantities of ...
Wlad - 2004-07-09 02:31:00
Dear all,
I have to boot-up a device based on Hitachi uP with external SDRAM
(2x256Mb). The device was designed by somebody else and I only have to
get it working. However there is something that bothers me very much.
Probably to easen PCB layout the designer has mixed data and address
li...
We are in the process of writing code to execut out of SDRAM for the first
time in an upcoming project. Until now all our systems executed code out of
eprom or flash. However we need the speed that comes with running out of
SDRAM but are concerned about SDRAM reliability issues and the possbility...
I have seen plenty of ARM MCUs out there with impressive power
consumption, but a very few offer SDRAM, and only one has PCI
interface.
The motorola types, Dragonball and coldfire have these features, but
are an order of magnitude more expensive on power. What is the least
power consuming 32-...
pratikmittal4u - 2006-03-21 04:26:00
Hi All,
I am working on a prototype board based on at91rm9200dk.now i have placed
only one SDRAM (16 MB)on my board.I am able to access the sdram and flash
successfully but now after storing the gzip image u-boot.gz in flash when
the
board get reboot from external flash, it got hanged at
U...
RaceMouse - 2007-05-31 09:12:00
Greetings,
I am experimenting with FreeRTOS, external SDRAM, display and GCC on a
SAM7SE512-EK.
I am trying to put the code in internal flash and the data and bss
sections in external SDRAM. The first thing my boot.s does is a call to
a function that initialises the EBI and SDRAM. The int...
lbczjyx - 2006-08-15 07:52:00
I use U-boot-1.1.1, and ARM-linux-2.4.27, at91rm9200DK, 2 chip SDRAM 16-bit
width.
In uboot context, I can access all the 64Mega of SDRAM well.
In linux context, I can see 64Mega SDRAM by "free", and 46Mega available.
I test memory, if the used memory bytes increase to 32Mega, the kernel
o...
In my experience, even using SDRAM with SDRAM controllers is risky.. unless
you've seen the exact two parts work together, all is not absolutely
plug'n'play. Adding it to a LPC2106 -- with no external bus -- sounds like
misery. You'd probably need a second micro, with a SPI and an SDRAM
interf...
xtmtd - 2006-11-24 03:21:00
working with xilinx edk.
I have a sdram of 32M, when I tried to copy data from flash to sdram, it
works well only when the accouts is less than 8K, when i copy data,
which is more than 8K,it is wrong. it just repeatly copy a little data to
sdram,what is the problem should be? I am sure my fla...
xtmtd - 2006-11-24 03:25:00
working with xilinx edk.
I have a sdram of 32M, when I tried to copy data from flash to sdram, it
works well only when the accouts is less than 8K, when i copy data,
which is more than 8K,it is wrong. it just repeatly copy a little data to
sdram,what is the problem should be? I am sure my ...
Hi everyone,
ive been trying to interface a 16MB SDRAM (MT84LC8M16A2, 128Mbit,
2x16x4)with an AT91RM9200 on my custom board. The SDRAM and the uC are
placed close to each other on the 2-layer PCB (which me and my friend
designed).
I wrote a small SDRAM test program that sends a unique *byte...
oe1gca - 2008-09-10 15:03:00
Hi!
With our current SDRAM initialization (in our boot code), sometimes the
SDRAM does not work correctly after power-up reset. Every second quad-word
can't be accessed (it seems that it can't be written).
When the SDRAM is in this erroneous state after power-up, repetitive
resets (not power-u...
Hi everyone,
ive been trying to interface a 16MB SDRAM (MT84LC8M16A2, 128Mbit,
2x16x4)with an AT91RM9200 con my custom board. As u might have guessed,
its not working. Ive checked and rechecked the continuity of all
connections, they seem to be okay. The SDRAM and the uC are placed
close to e...
Hey All,
I have a Blackfin 533 EZKit. I have ahd great success with every
peripheral except the SDRAM.
The doccumentation states that the SDRAM bus is automatically
configured so long as the auto-configure box is checked under Target
Options(which it is)
I must be oversimplifying this b...
Hi!
I am writing a SDRAM controller with VHDL.And I have blocks of data t
store into the SDRAM very quickly,so SDRAM should be in BURST writ
state,isn't it?My question is if the BURST write state continues a lon
time(such as 1 second),should I stop BURST write and perform an AUT
REFRESH operati...
"Hijax" skrev i meddelandet
news:d6rvkd$1hl$1@nemesis.news.tpi.pl...
> Hello,
>
> Is it possible to use a low voltage (1.8V) SDRAM chip with the AT91RM9200?
> All the schematics i've seen or the finished boards uses 3.3V ones.
>
> Regards,
>
> Arek
>
Yes, you can run with 1...
werty - 2006-12-27 19:25:00
Im looking for ARM eval boards ...
I look under ARM .... Nothing Nothing Nothing ..
I look under ETHERNET .... There it is !
An ARM 7 , SD card slot CPLD 144 cell
EtherNet ... yep all hardware is there ...
except SDRAM ....
CRIPPLED ! How do you develope wi...
I am working on a microcontroller design using the LH79520.
I would like to use the Micron MT48LC4M32B2 SDRAM which is 128Mb
with a 32bit data path.
However in looking at the Sharp user manual, the sdram controller
does not have a configuration listed for a 4Mx32 memory. The closest
is 2M...
dougmackx - 2008-02-06 15:38:00
What options are there for performance increase since code is running in
SDRAM if burst length is limited to 1?
...
It appears that the SDRAM controller built into Atmel's AT91RM9200 ARM
9 chip only supports a burst length of 1.
Exactly what use is an SDRAM burst with a length of 1? What advantage
does it have over an ordinary (non-burst) SDRAM access?
Ulf, are you there?
--
Jack Klein
Home: http:/...
kalyanamsaritha - 2008-09-05 18:20:00
Given SDR SDRAM with 16-bit width, I have seen both 16-bit and 32-bit (2 x
16-bit) configurations, and am considering which way to go.
What are the pros/cons?
1. Cost?
2. Performance?
3. Ease of board layout?
[This may have been asked earlier on this forum in some other form ...]
Thank...
2009-02-10 17:07:00
i don't understand some definitions about SDRAM:
1)COLUMN: smallest unit data....if SDRAM is 4Mx16(=1megx16x4banks), is
16 colum's number of bits or data out bits?Column's number of bits and
data out pins are always the same or can differ each other?
2)BANK: in datasheet i found 1,2,4,etc...are ...
Hello!
I just wanted to know if it is possible to access e.g. 16Mbyte SDRAM
with an LPC2214 with an ARM7TDMI core? I think the necessary pins are
all lined out.
How to connect the RAM chip to the controller? I need this RAM for
running ucLinux on it.
Thanks a lot for the answers,
Karl
...
Hi all,
I made a board using sharp LH79520 and micron sdram 8MB and flash
memory.
I made a boot loader (running from the flash) which is just putting the
binary image (made by the crossworks IDE) into the SDRAM.
Now the problem is that program code is written and verified properly
in the...
tullio.grassi - 2007-01-30 08:59:00
Hi,
to ease the routing of my PCB, I'd like to swap some data lines on a
SDRAM.
I'd like to be 100% sure that the swapping will not create problems
once the PCB is built.
I use a SDRAM MT48LC8M16A2 from Micron.
The only documentation that I found is:
http://www.freescale.com/files/32bit/...
alexf - 2006-04-15 07:55:00
hi,
would anyone have a basic script that initializes the external SDRAM on
the AT91RM9200-EK board? This is to be used with a JTAG emulator.
Thanks,
Alex
...
Does anyone know where small quantities of SDRAM chips (not modules) could be purchased?
Thanks,
Alex Parkinson
...
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