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SDRAM initialization
Started by Jim Stewart 7 years ago
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...
Help with simplified SDRAM access
Started by yo 9 years ago
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...Program in external SDRAM and caching
odi - 2009-06-14 14:19:00
hi,
I have a simple program for my AT91RM9200 to turn led on and off. When I
run it from internal SRAM it works ok, but when I copy it into external
SDRAM and execute from there it jumps to address 0x2000001c (FIQ vector or
is it just a coincidence?) instead of 0x2000003c (start code is there).
64M...LPC2470 - SDRAM does not work
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...SDRAM Initialization Sequence
Started by mantaray 8 years ago
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!
...Using SDRAM
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...DDR SDRAM
Started by Unknown 7 years ago
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
...SDRAM initialization sequence
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...SDR SDRAM compability
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...SDRAM init & data bus
aleksa - 2011-02-22 16:51:00
I need someone to confirm that the SDRAM
does not use data bus to receive commands.
Which means that I can mix the data bus in whatever
way it suits me while am routing the PCB... right?
(i.e., connect D0 on MCU do say, D5 on SDRAM)
TIA
P.S.
I really don't like the guy who wrote 0xc...AT91RM9200- SDRAM interface
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.
...why not can it access more than 8K of the sdram?
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 ...why not access much than 8K of the sdram?
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...Interfacing AT91SAM9260 with cheap SRAM or SRAM?
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 ...Infineon TC1130 SDRAM controller.
Started by Unknown 5 years ago
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...AT91RM9200 problems to run from SDRam
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 ...Segger file system and SDRAM
bikerdan - 2011-01-25 07:43:00
I am working with an LPC2478 and the Segger file system and an IAR IDE. I
am having trouble getting the file system to work out of SDRAM. It works
fine from on chip RAM. The SDRAM even passes a memory check. But when I try
to open a file with the Segger file system using SDRAM, at one point in the
e...armlinux oops once access more than 32Mega SDRAM
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, th...Why Two SDRAM in AT91RM9200dk used
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...Problem with SDRAM SAMSUNG K4S511632D-UC75
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...Running code out of RAM
Started by Haran Vela 9 years ago
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...Coldfire and SDRAM
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.
...SAM7SE512 and external SDRAM
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...Yet another SDRAM init request - MT48LC4M32B2 on MCF5329
ahunsdon - 2010-02-01 12:35:00
Sorry guys - I know this an old subject but I am having problems and
need your help.
MCF5329 Coldfire processor (80Mhz) interfacing to MT48LC4M32B2 SDRAM.
New design loosely based on the EVB reference.
Started with the config from the 5329 EVB board and tweaked from
there.
Works OK with ...Sharp LH79520 and 32 bit SDRAM
Started by db 9 years ago
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...A question about SDRAM's refresh!
Started by justnow 8 years ago
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...Question about SDRAM
Started by Unknown 4 years ago
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 ...Lowest power 32-bit MCU with PCI, SDRAM?
Started by Ghazan Haider 9 years ago
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-...Mixing address lines in SDRAM.
Started by Wlad 9 years ago
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...Blackfin DSP SDRAM Memory
Started by Rob Reed 9 years ago
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...problem while executing program from external SDRAM
Started by aditya 8 years ago
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...sram vs sdram
Started by Unknown 6 years ago
seems a lot of applications use sdram rather then sram. What are the
pros and cons of each? The only siginifacnt difference I see is
density.
...Source for SDRAM chips
Started by Alex Parkinson 8 years ago
Does anyone know where small quantities of SDRAM chips (not modules) could be purchased?
Thanks,
Alex Parkinson
...www.microcontrollershop.com
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...AT91RM9200: Errors in transferring file into SDRAM via HyperTerminal (xmodem protocol)
Started by Mayank Kaushik 8 years ago
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...ARM7 + SDRAM
Started by Karl Katt 8 years ago
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
...word and long access of SDRAM
JY Kim - 2007-06-19 04:56:00
I am working with samsung 2410 and k4S561632A 256M SDRAM
we are using SDRAM only as 128M
With trace32 we have confirmed word access of SDRAM works right.
Setting display format as 16 bit and writing word at trace32 termial
works right.
But when we set display type long, and writing 32 bit data...Atmel ARM AT91RM9200 SDRAM Issue
Started by Jack Klein 9 years ago
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:/...SDRAM with YFBGA
phateshawn - 2007-07-18 08:40:00
Hi all,
I would like to solder a mobile SDRAM with YFBGA package to a PCB. I don't
have a heating oven to solder it in a conventional way. Can anybody suggest
me an inexpensive way to achieve this?
Thanks,
-Phate
...LPc2478 external Sdram initialization Help Needed
Dravid - 2010-02-04 08:52:00
Hi all,
Am using lpc2478 for 6.5 TFT LCD development in that am using
256Mb(K4S561632E-FROM SAMSUNG) SDRAM for LCD FRAME BUFFER. can anyone help
me to solve the sdram initialization problem,
i have attached the sdram init coding can anyone suggest me to solve the
sdram initalizing problem.
v...