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Memfault Beyond the Launch

executing program from external SRAM of EAs MCB2478

Started by Oliver Krause in comp.arch.embedded8 years ago 6 replies

Hi guys, I have a problem and allthought I desperately tried to solve it there is no resolution in sight. So I really hope you can help me. My...

Hi guys, I have a problem and allthought I desperately tried to solve it there is no resolution in sight. So I really hope you can help me. My setup: - embedded artists MCB2478 - Keil ULINK 2 JTAG adaptor - workstation with uVision 5 I have to program my prog onto external memory to preserve the flash ROM of the microcontroller. I found a Q&A about this topic and an example for a control...


Memory selection for an embedded system

Started by Anonymous in comp.arch.embedded18 years ago 6 replies

Hi all, I'm currenlty gettting into embedded system architecture and would like to know where can I find any kind of tutorial/articles/lecture...

Hi all, I'm currenlty gettting into embedded system architecture and would like to know where can I find any kind of tutorial/articles/lecture notes regarding the "art" of selecting the memory for my design I.E. what kind of memory to use SDRAM , SRAM ,FLASH ,EEPROM and where to use it. another thing I'm looking for is stuff on the subject of memory mapping I.E. how to arrange the different ...


Recommended Brands for NVRAM

Started by Noway2 in comp.arch.embedded18 years ago 8 replies

I am looking for recommendations on brands of non volatile sram. I want a device on the order of 32k - 512k by 16 bits, long non powered data...

I am looking for recommendations on brands of non volatile sram. I want a device on the order of 32k - 512k by 16 bits, long non powered data retention, and a real time clock would be preferable but not necessary. Speed isn't very criticical as I am running a 30 MHz bus clock with controllable wait states, so most memory devices will probably be a lot faster than my bus. I have looked at...


Production programming of battery-backed SRAM

Started by Clive Wilson in comp.arch.embedded20 years ago 7 replies

Dear All, I'm not sure if what I'm about to propose is achievable, won't work, or just plain wacky. I'm attempting to design an ARM7-based...

Dear All, I'm not sure if what I'm about to propose is achievable, won't work, or just plain wacky. I'm attempting to design an ARM7-based system which has no Flash, on-chip or off. There is a requirement to have NVRAM, i.e. battery-backed. So I'm thinking, can I manage with only the NVRAM? One major concern of mine is how to initially insert the run-time code in the NVRAM in the firs...


Help me understand SAM9260's clocks

Started by aleksa in comp.arch.embedded14 years ago

I've started programming AT91SAM9260 and some things are not clear to me. At first, sam-ba was giving me...

I've started programming AT91SAM9260 and some things are not clear to me. At first, sam-ba was giving me problems (http://embdev.net/topic/184418), so I created a small win32 app to mimic sam-ba. On reset, sam9260 sends "RomBOOT> " and then listens to commands. I then issue some commands to write to internal SRAM and then execute it. All that works. Speed is what interests me now, so


Floating buses (hardware problem)

Started by Geoffrey in comp.arch.embedded18 years ago 7 replies

Hi Everyone In the case of a simple configuration comprising a CMOS microprocessor plus one external CMOS SRAM, it may well happen that the...

Hi Everyone In the case of a simple configuration comprising a CMOS microprocessor plus one external CMOS SRAM, it may well happen that the processor's external bus interface becomes inactive for long periods (for instance, when the uP is accessing code and data in internal memory). In this case, the bus is high impedance, and could, in principle, float to a voltage mid-way between the p...


DS80C400 -- SDCC simple demo app. that runs in RAM?

Started by bsd_mike in comp.arch.embedded18 years ago 2 replies

Hello, Are there any DS80C400 users out there? Would anybody have a simple app. that runs out of SRAM compiled under SDCC? Thanks, ...

Hello, Are there any DS80C400 users out there? Would anybody have a simple app. that runs out of SRAM compiled under SDCC? Thanks, Mike


Lowest power RAM

Started by ghazanhaider in comp.arch.embedded18 years ago 7 replies

Hi, What kind of RAM can be used with the lowest power available, with an MCU that might run either at 15MHz or 1MHz, possibly both? The chip...

Hi, What kind of RAM can be used with the lowest power available, with an MCU that might run either at 15MHz or 1MHz, possibly both? The chip is LPC2210, which allows 8,16,32-bit wide data busses and can do SRAM, DRAM or EDO. I'm not worried about the cost or speed. The ram will also be underclocked to match the MCU, and also to lower power requirements. I'm hoping for under 1mA @ 3.3v or ...


Battery-backed RAM

Started by Geoffrey in comp.arch.embedded18 years ago 2 replies

Hi Everyone I'm designing a system which uses low power SRAM powered by battery as a backup device. The data sheet states that all I/Os mus be...

Hi Everyone I'm designing a system which uses low power SRAM powered by battery as a backup device. The data sheet states that all I/Os mus be kept within 0.2V of either Vcc or GND for the standby current to be guaranteed. This is no surprise, one CMOS device must be held firmly in the off state. The I/Os will be connected to a powered down CMOS buffer while in standby mode, and my ...


Seeking Video Generator IC

Started by Nappy in comp.arch.embedded18 years ago 5 replies

I am looking for a device which will generate video from attached memory containing bitmaps. I would like to be able to generate NTSC,PAL,RS343...

I am looking for a device which will generate video from attached memory containing bitmaps. I would like to be able to generate NTSC,PAL,RS343 and RS170 video from bitmaps I can change in Flash or SRAM.So hopefully the device will contain memory addressing and timing parameter registers. Considering building our own logic to do this but I have to assume there are solutions on the shelf somew...


How much RAM needed for low end Ethernet application?

Started by Ulf Samuelsson in comp.arch.embedded19 years ago 49 replies

I would be interested to understand the RAM needs when you have simple Ethernet applications. Is 32kB/64 kB SRAM enough for a decent...

I would be interested to understand the RAM needs when you have simple Ethernet applications. Is 32kB/64 kB SRAM enough for a decent application or do you need more? I think there are simple applications where you dont need too much info but will they fit? -- Best Regards, Ulf Samuelsson ulf@a-t-m-e-l.com This message is intended to be my own personal view and it may or may not be s...


MCU reset and internal SRAM starting values

Started by pozz in comp.arch.embedded2 years ago 2 replies

I often use with success a simple way to implement a bootloader: #define START_MAGIC 0xAA55AA55 uint32_t start_application...

I often use with success a simple way to implement a bootloader: #define START_MAGIC 0xAA55AA55 uint32_t start_application __attribute__((section=".noinit")); void main(void) { ... if (start_application == START_MAGIC) { start_application = ~START_MAGIC; launch_application(); } /* Stay in bootloader and wait for new application from * USART, SPI, USB, wha...


Program in external SDRAM and caching

Started by odi in comp.arch.embedded15 years ago 8 replies

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...

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). 64MB of SDRAM was tested and looks ok. However when I disable instruction cache, this program works ok ...


SAM7SE512 and external SDRAM

Started by RaceMouse in comp.arch.embedded17 years ago

Greetings, I am experimenting with FreeRTOS, external SDRAM, display and GCC on a SAM7SE512-EK. I am trying to put the code in internal...

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 internal SRAM is left unused. When I upload the SW via SAM-BA, all I need to do is to press the re...


adsp2187L: assembler or C? [cross-post]

Started by Alessandro Basili in comp.arch.embedded13 years ago 18 replies

Hi, I have a custom designed board which is based on an ADSP2187L dsp, with a 512KB FLASH, a 128KB SRAM (20 ns cycle) and an FPGA running at 50...

Hi, I have a custom designed board which is based on an ADSP2187L dsp, with a 512KB FLASH, a 128KB SRAM (20 ns cycle) and an FPGA running at 50 MHz. The dsp task is mainly processing commands and data from external links (space-wire) on a 200~500 us cycle. Since the actual software has been written in assembler and there are some concerns about its reliability, I was wondering whether i...


X-Mega AVRs are here!

Started by Ulf Samuelsson in comp.arch.embedded16 years ago 36 replies

For people in this newsgroup that has been wondering... Key features * ATmegaAVR core (just higher frequency) * 1.6V-3.6V operation *...

For people in this newsgroup that has been wondering... Key features * ATmegaAVR core (just higher frequency) * 1.6V-3.6V operation * Flash (max 384 kB)/SRAM/EEPROM * 32 Mhz operation (max 32 MIPS) * 44/64/100 pin package The pinout allows a design to use 44,64 and 100 pin concentric pads with S/W compatability. Pin multiplexing will be identical for all I/O ports, Larger ...


AVR + Ethernet TCP - performance??

Started by Marek Garwolinski in comp.arch.embedded19 years ago 6 replies

Hello Anyone has used a TCP/IP on AVR?? I'm planning to build a system consisting of ATMega128 + external SRAM + RTL 8019. I'm thinking of...

Hello Anyone has used a TCP/IP on AVR?? I'm planning to build a system consisting of ATMega128 + external SRAM + RTL 8019. I'm thinking of use "uIP TCP/IP Stack". It will be sending about 200-500 bytes of data to the server on TCP, doing 8 A/C conversion, checking state of


LPC1102, World's smallest 32-bit ARM MCU in a 5mm2 pckg

Started by An Schwob in the USA in comp.arch.embedded14 years ago 11 replies

Hi, ever heard about a 32-bit microcontroller this tiny? I am familiar with the Silabs devices that are available in similar packages but this...

Hi, ever heard about a 32-bit microcontroller this tiny? I am familiar with the Silabs devices that are available in similar packages but this time it is an ARM Cortex-M0 and it has more I/O and memory than I thought. 10-bit ADC, 4 timers, UART, SPI, 32K Flash and 8K SRAM, really not bad for such a grain of silicon. Check it out. http://www.mcu-related.com An Schwob


ARM7 selection question

Started by Johnny in comp.arch.embedded20 years ago 3 replies

I am looking for the an ARM7 system with the following features: * 256kB on-chip SRAM. * Ethernet MAC (Could be external) * USB Device...

I am looking for the an ARM7 system with the following features: * 256kB on-chip SRAM. * Ethernet MAC (Could be external) * USB Device interface (Could be external) * External interface for several MB of flash memory. My application: * No more than about 10 MIPS processing speed, plus any extra for servicing Ethernet and USB. * Cost sensitive. * Planned to stay in production for 5 year...


Which MCU has these features?

Started by Ghazan Haider in comp.arch.embedded19 years ago 10 replies

The linux-tiny project has reduced the linux kernel down to ~300kb, able to run in 2MB of RAM. With uclibc and busyboy, I can have a running...

The linux-tiny project has reduced the linux kernel down to ~300kb, able to run in 2MB of RAM. With uclibc and busyboy, I can have a running system in under 2MB of flash. So I started looking for ARM MCUs, a few have 2MB flash onboard, one from atmel has 2MB SRAM onboard, but I couldnt find any that has both. ARMs no limitation, but it shouldnt be as inefficient as x86 with power, and shou...



Memfault Beyond the Launch