Sign in

username:

password:



Not a member?

Search Comp.Arch.Embedded



Search tips

embedded by Keywords

68HC11 | 68HC12 | 8051 | 8052 | ARM | ARM7 | Asic | AT91 | AT91RM9200 | Atmel | AVR | AVRStudio | Bootloader | CFP | CompactFlash | Cygnal | Cypress | Dataflash | DSP | eCos | EEPROM | Embedded Linux | Emulator | Endian | Ethernet | Firewire | FPGA | Freescale | GCC | GNUARM | GSM | H8 | HDLC | I2C | Infineon | Interrupts | Java | JTAG | LCD | LED | LPC2000 | MCU | Microchip | MMC | MPLAB | MSP430 | PC104 | PCB | PCI | PCMCIA | PowerPC | Rabbit | RS232 | RS485 | RTOS | SBC | SDRAM | Sensor | SPI | STK500 | UART | UML | USART | USB | Verilog | VHDL | VxWorks | Xilinx


Ads

Discussion Groups

See Also

DSPFPGAElectronics

SDRAM

Comp.Arch.Embedded is a worldwide Usenet news group that is used to discuss various aspects of Embedded Systems development.

We found 340 threads matching "sdram"

You are looking at page 1 of 9.

The most relevant threads are listed first

Help with simplified SDRAM access

yo - 2004-10-26 16:11:00
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...Help with simplified SDRAM access

SDRAM initialization

Jim Stewart - 2006-07-15 19:40:00
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...SDRAM initialization

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...Using SDRAM

DDR SDRAM

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 ...DDR SDRAM

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...SDR SDRAM compability

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 reading d...LPC2470 - SDRAM does not work

SDRAM Initialization Sequence

mantaray - 2005-02-15 22:53:00
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! ...SDRAM Initialization Sequence

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...SDRAM initialization sequence

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. ...Coldfire and SDRAM

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 ...AT91RM9200 problems to run from SDRam

ARM9 and SDRAM. Need help

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 ...ARM9 and SDRAM. Need help

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. ...AT91RM9200- SDRAM interface

Infineon TC1130 SDRAM controller.

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...Infineon TC1130 SDRAM controller.

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 ...Interfacing AT91SAM9260 with cheap SRAM or SRAM?

Mixing address lines in SDRAM.

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...Mixing address lines in SDRAM.

Running code out of RAM

Haran Vela - 2004-05-23 22:46:00
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...Running code out of RAM

Lowest power 32-bit MCU with PCI, SDRAM?

Ghazan Haider - 2004-10-31 23:30:00
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-...Lowest power 32-bit MCU with PCI, SDRAM?

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...Why Two SDRAM in AT91RM9200dk used

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...SAM7SE512 and external SDRAM

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, the kernel o...armlinux oops once access more than 32Mega SDRAM

Re: add SD-RAM in ARM7

Ian McBride - 2003-12-17 21:42:00
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...Re: add SD-RAM in ARM7

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...why not access much than 8K of the sdram?

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 can it access more than 8K of the sdram?

AT91RM9200: Errors in transferring file into SDRAM via HyperTerminal (xmodem protocol)

Mayank Kaushik - 2005-05-03 11:46:00
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...AT91RM9200: Errors in transferring file into SDRAM via HyperTerminal (xmodem protocol)

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...Problem with SDRAM SAMSUNG K4S511632D-UC75

trouble interfacing 16MB SDRAM to AT91RM9200 :-(

Mayank Kaushik - 2005-05-01 13:01:00
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...trouble interfacing 16MB SDRAM to AT91RM9200 :-(

Blackfin DSP SDRAM Memory

Rob Reed - 2004-01-28 14:59:00
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...Blackfin DSP SDRAM Memory

A question about SDRAM's refresh!

justnow - 2005-08-22 09:54:00
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...A question about SDRAM's refresh!

Re: AT91RM9200 low voltage SDRAM...

Ulf Samuelsson - 2005-05-30 12:04:00
"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...Re: AT91RM9200 low voltage SDRAM...

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...www.microcontrollershop.com

Sharp LH79520 and 32 bit SDRAM

db - 2003-12-16 00:29:00
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...Sharp LH79520 and 32 bit SDRAM

SDRAM interface on ARM AT91RM9200

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? ...SDRAM interface on ARM AT91RM9200

Atmel ARM AT91RM9200 SDRAM Issue

Jack Klein - 2004-11-08 21:21:00
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:/...Atmel ARM AT91RM9200 SDRAM Issue

SDR SDRAM 16-bit vs 32-bit

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...SDR SDRAM 16-bit vs 32-bit

Question about SDRAM

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 ...Question about SDRAM

ARM7 + SDRAM

Karl Katt - 2005-03-04 08:45:00
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 ...ARM7 + SDRAM

problem while executing program from external SDRAM

aditya - 2005-06-16 07:33:00
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...problem while executing program from external SDRAM

pin swap in SDRAM

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/...pin swap in SDRAM

AT91RM9200-EK SDRAM init sequence

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 ...AT91RM9200-EK SDRAM init sequence

Source for SDRAM chips

Alex Parkinson - 2004-12-24 12:23:00
Does anyone know where small quantities of SDRAM chips (not modules) could be purchased? Thanks, Alex Parkinson ...Source for SDRAM chips
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | next