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Questions tagged [sd]

Secure Digital (SD), a memory card standard. Has multiple form factors (Standard, MiniSD and microSD/TransFlash) and multiple capacity ratings (SDSC, SDHC, and SDXC). Also extends to SDIO, which allows peripherals in an SD form factor to attach to a host, similar to USB.

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18
votes
6answers
43k views

What is the correct command sequence for microSD card initialization in SPI?

I am trying to interface a microSD card (2 GB, Kingston, Sandisk) with a Silicon Labs C8051F931 controller. I am very much confused about the sequence which I have to follow for initialization. ...
13
votes
11answers
12k views

How to make 1 bit permanent memory circuit?

I would like to make a simple circuit to store or save 1 bit of data. The circuit should be able to remember the state of an LED ( on or off ) even if the supply is disconnected from the circuit. I ...
3
votes
1answer
2k views

SD card initialization problem - CMD8 wrong response

I am trying to interface an microSD card to a microcontroller board (FRDM-KE06Z) using FatFS code. I only modified SPI parts for my application. Besides digging into FatFS code also I checked this ...
51
votes
7answers
45k views

Is it true that a SD/MMC Card does wear levelling with its own controller?

I can't find any reliable information about this. I don't have the full specification of the SD/MMC Card hardware. Is it true? My high-level application doesn't need to be concerned with wear ...
24
votes
5answers
8k views

Do I need to pay royalties to the SD card people if my device “just happens” to be compatible with SD cards? [closed]

I'm designing something which will use an SD card. The device will be able to read and write the cards, using publicly available specifications. Do I need to pay the SD card people?
1
vote
2answers
1k views

Connect a microSD reader to a LilyPad USB, where are the digital ports?

I am attempting to connect a microSD breakout board to a LilyPad Arduino USB. The microSD board has previously been connected to an Arduino Duemilanove. In the Duemilanove setup, the following ...
1
vote
1answer
1k views

Using STM32 to transfer a file via bluetooth

So far I have been doing projects with Arduino, RPi, ATtiny etc. But now I have project in mind where these things doesnt seem to suit. I need your help. OK, now on the project: I have a file on my ...
7
votes
2answers
9k views

Is it possible to use 4-pin mode for an SD card with a microcontroller instead of SPI mode?

Is it possible to use the 4-pin mode of an SD card when designing an interface with a microcontroller, or must you always use SPI mode? I am particularly thinking of a microcontroller such as a PIC24. ...
13
votes
7answers
7k views

Saving data to an SD card memory module using an Arduino

Is it possible to save data from the Arduino to an SD card memory module?
7
votes
2answers
26k views

Difference between 1-bit, 4-bit and 8-bit SDIO

Please help me understand the significance of 8-bit SDIO over 1-bit and 4-bit SDIO. Let me know the pros and cons of each type. Wiki or SDIO specification document does not discuss this.
6
votes
1answer
6k views

MicroSD flash block size

I'm working on a low-power application with data storage on a microSD card. In the interest of minimizing power consumption, I'm planning to buffer data to RAM before writing, and I suspect that the ...
6
votes
2answers
4k views

Diagnosing SD card failures

I have an embedded device using an SD card. Occasionally I see SD cards fail, and I need to understand the failure mode. Are there tools, perhaps for specific manufacturers, that help me understand ...
6
votes
3answers
3k views

MicroSD with ECC

Some MicroSD cards (mostly Transcend) claim to have an ECC controller on the chip. I was wondering how this works? Do they verify all data written to it, and automaticly relocate the sectors to ...
0
votes
2answers
566 views

SDXC Card Reader with LPC1822

in my application I have an SD Card reader using the NXP LPC1822 microcontroller. It works very good with all SD- and SDHC-Cards I've tested so far. Only thing that does not work is SDXC. I already ...
5
votes
6answers
2k views

SDHC card, a microSD shield, and Arduino Duemilanove

I got a new microSD shield from LittleBird and am having some troubles with it. I downloaded the sample library that it said to used, threw in a microSD card and expected it to work... It won't ...
3
votes
1answer
787 views

Why I can't issue commands after CMD8 to an SDHC card in SPI mode?

I am using the following sequence of commands at 250 kHz SPI to initialize SD cards: (1 ms wait, then 80 clocks) CMD0 with argument 0x00000000 CMD59 with argument 0x00000001 (turn on CRC ...
2
votes
2answers
319 views

Will cutting only the Power Lines damage the Data Lines or the Device?

A USB 2.0 Cable should have 4 cables. They are the Vcc, Data+, Data- and Ground. Will only disconnecting the Vcc OR Ground Wires damage the Connected Device or the Data Wires? I currently have a USB ...
1
vote
1answer
417 views

Designing a large 7-Segment display

I'm trying to design a product that have the following features for mass production, and I'm asking from your experience, how to get the lowest price for the components, quality of the chips in terms ...
1
vote
2answers
3k views

How does an SD card communicate with a computer? [closed]

Could someone please give me a concise explanation to how an SD card sends and receives data from a computer. Does it do this one bit at a time? How does the computer/SD card combine these individual ...
1
vote
3answers
10k views

SD card Sector size

I am working with an SD card using AVR microcontroller. Questions: Is it possible to change the sector size of SD cards or is it fixed 512 bytes in SD card's case? What things should be considered ...
4
votes
2answers
248 views

What gives some flash memory a higher speed rating than other flash memory?

What gives some SD/MMC cards a much higher speed class rating than other SD/MMC cards? Why are some solid-state "disks" (SSDs) much faster than other SSDs? I'm hoping that I can take at least some ...
4
votes
5answers
8k views

SD card emulation

Problem description: I've built a MSP430F2370 based 15693 RFID tag reader/writer . The main board has a daughter board, shaped as a SD card, which connects to a SD card holder/reader. We were ...
3
votes
1answer
552 views

Is it viable to power a circuit board featuring an SD card using a coin cell battery?

I'm currently working on an electronics project implementing an SD card. It is also required that this device be portable and small, thus I'm attempting to use a coin cell to power the board. ...
3
votes
1answer
277 views

What determines the actual power consumption of writing to a microSD card?

I'm currently working a project that will feature writing data to a microSD card. Because my project will be battery powered with a 125mA power regulator, I'm concerned that my write operations will ...
3
votes
1answer
260 views

For variable voltage devices, namely SD cards, how much power do you save by using a lower voltage?

I'm designing a computer vision system and my 3 main components are microcontroller (VDD = [1.8V, 3.6V]) microSD card (4 bit mode, VDD = [2.7V, 3.6V] according to SD 2.0 standard) cheap cell phone ...
1
vote
1answer
90 views

What mode of SPI is the standard if nothing regarding the mode is mentioned in the slave datasheet?

I am trying to bit bang SPI for a SD Card, I went through this SD Card datasheet and I couldn't find any information regarding the mode that needs to be used. If I missed, please point it out. Else ...
1
vote
0answers
239 views

Atmel ARM, USB, and an SD Card as a MSD?

I'm currently trying to run the SAM L21 as both a CDC and an MSD over USB. Thankfully there is example code here to get me started. I can move files into the on-board ram just like any other storage ...
0
votes
0answers
142 views

Microsd card PCB circuit designing

I am trying to develop a microSD card module myself. My microSD card module is working at 3.3V and my microcontroller is operating at 1.8V. I have therefore used TXB0104 voltage level shifter to ...
0
votes
1answer
448 views

Partial write protection for SD cards

I am familiar enough with eMMC features as there is a great deal of documentation about them. I understand that SD cards have permanent write protection, temporary write protection, and even password-...