Delkin Blog

SD Card Interface FAQs and Answers

SD Card Pins

 

The Secure Digital Card Association established the specifications required for all Secure Digital (SD) memory cards, including the command protocols and the physical SD card interface. This simplifies the application development process for engineers, as the strict guidelines eliminate unexpected deviations and support predictable, reliable operations. Here is a look at the answers to a few common questions about the SD card interface.

 

How can I access the official SD card interface specifications?

The Secure Digital Association maintains tight control over the specifications. It’s possible to discover some information about the SD card interface specs that is publicly available. However, developers are advised to become members of the Secure Digital Association in order to gain full access to all of the specifications. This also provides access to new developments, which can be essential information for OEMs that are incorporating SD cards into their applications.

 

How do SD card operations work?

Intelligent controllers are responsible for supporting the data transfer between the SD card and the host system, and for managing the flash operations. The data transfer is achieved serially in 512 byte blocks. The defined file system depends on the specific capacity of the SD card. SD cards capable of storing 4GB and more follow the FAT32 file system. For cards with capacities of 2GB or less, the file system is FAT12/16.

 

What is the default bus protocol?

The SD card interface follows a default bus protocol of SD mode. However, OEMs may configure the card to operate in SPI mode. If reconfigured for SPI mode, the SD card will only operate in 1-bit mode. If the SD card maintains the default bus protocol of SD mode, then it will operate with bus widths of 1 to 4 bits, in clock serial mode.

 

Delkin provides reliable, high-endurance NAND flash storage solutions for industrial grade applications. Our team of data storage experts is available to answer your questions as you explore industrial and commercial SD memory card options. Contact us directly if you would like to request a product sample.

 

Contact

  • This field is for validation purposes and should be left unchanged.

Related Posts

Embedded OS: Windows vs. Linux

    The August 2019 announcement by Microsoft that they would no longer be supporting Windows...

Write Amplification in True Embedded Applications

  When it comes to embedded storage, there are many differences between solid state drives,...

S325TLLM7B-C1000-3 - SD - microSD - 256MB - SLC
SMART microSD Cards Explained

  The trends in tech design are pushing in two seemingly incongruent directions: devices are...

Delkin Devices Industrial USB Flash Drive
High Capacity Flash Drive FAQs

  With solid state drives (SSDs) dominating the market for embedded storage and external hard...

What Is an M.2 SSD?

  Solid state drives, or SSDs, have changed the way that designers and engineers think...

Collaboration- Putting together pieces of the puzzle
Memory Electronics: Selecting the Right Memory for Electronic Applications

  When building an electronic application that requires embedded storage, one of the biggest decisions...

Delkin Devices Utility SSD (1.8” / 2.5” / mSATA)
FAQs about SSD Utility Grade

  SSDs, or solid state drives, are used in a huge array of industrial and...

ME5HAPX7V-3N000-2 - SATA - mSATA (MO-300B) - 512GB - MLC
What is a 32GB mSATA drive?

  A 32GB mSATA drive is a solid state drive that uses the SATA interface....

Memory Manufacturers- Delkin Devices

  Contrary to popular belief, all memory manufacturers are not created equal. Even with memory...

Conformal Coating Benefits

  Memory cards and SSDs are often exposed to environmental conditions that could cause damage,...