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

Delkin Applications
Top Reasons for Industrial Flash Storage Use in Transportation Applications

  Many modes of transportation including motor vehicles, trains, and aircraft use industrial flash storage...

Life Cycle Management
Technical Success Story: Program/Erase Cycles and SMART Commands

  A challenge faced by application engineers is the concept of balancing reliability and industrial...

Utility+ msata
Solid State Flash Drive SATA

  A solid state flash drive SATA is an SSD that uses the SATA interface....

A Look at Legacy Electronics Memory

  Although conventional wisdom dictates using the newest technology possible, it is not always feasible...

Write Protection

  Purpose of Write Protection Write protection is a feature on flash storage cards and other...

Flash Storage Interface- NAND vs. NVMe

  NAND vs. NVMe- The need for data storage capacity and speed in industrial applications...

Technical Success Stories: Industrial Flash Storage Customization

  “One-size-fits-all does not work for our embedded/industrial high capacity application. Flash storage customization is...

A Look at microSD Memory Suppliers

  Are you looking for reliable, rugged storage for a device used in industrial operating...

Industrial Flash Storage in Flight Data Recorders

Flight data recorders are a key component of aviation safety. Information gleaned from flight...

Technical Success Story: Locked BOM Maximizes Performance and Speed

  A locked BOM, or bill of materials, is one of the key advantages to...