Tashkent university of information technologies subject of operating systems

DSR - (Driver Stage Register) Size: A Drive Level Register that belongs to an optional register to set the drive output.
Interface Manager
It is mainly used to control and manage the core of the internal memory, to receive and respond to commands sent by the user for control and adjustment, and then to read / write the response data and perform other operations.
Internal storage medium
Flash block stored in data memory.
Driving mode
The SD card has two drive modes: SPI mode and SDIO mode. The interface signals they use are different. In SPI mode, the SD card has only 4 signal lines, i.e. CS, DI, SCLK and DO (SD card selection, data input, clock and data output).
Transmission mode
The SD card supports three transmission modes: SPI mode (independent serial input and serial output), 1-bit SD mode (independent router, data channel, single transmission format), 4- bit SD mode (using an additional pin and resetting the exact PIN Supports four-bit parallel transmission).
Low-speed cards typically support data rates of 0 to 400 kilobits / second using SPI and 1-bit SD transmission mode. The high-speed card supports 0 ~ 100 megabit / sec data transfer speed using 4-bit SD transfer mode; Support 0-25 megabits / sec, SPI and 1-bit SD mode.
Manufacturers, vendors, and host adapter manufacturers are required to pay SD / SDIO licensing fees, as well as $ 1,000 to $ 1,500 per year. However, SDIO card and MMC adapter manufacturers do not have to allow payments. The MMC card uses a 7-pin interface, an SD card and an SDIO card with a 9-pin interface.
Ⅴ SD card products
MINI SD card
MINI SD is developed by Panasonic and SanDisk. The first appearance was at the SanDisk booth at CEBIT in 2003. Since then, he has added Memory Stick Duo and XD cards as a small memory card specification.
The design of the MiniSD-card was originally made to take pictures with a photo pine mobile phone.
It can also be used by the SD adapter card as a generic SD card.
The capacity of the MiniSD card is from 16 MB to 8 GB, and the capacity of the MiniSDHC card is from 4 GB to 16 GB.

Different SD card resolutions


Micro SD card
In the ultra-small memory card product, the SD Association took the lead in adding T-Flash to its family and renamed it Micro SD to replace the Mini SD mode.
Only after the nail size did the Micro SD come as a surprise after its launch in 2005. In 2008, the phone distributed this very small memory card.
The M2, Micro SD and MMC Micro are included in the list of the smallest mini memory cards in the world, and the ultra small size has great advantages. It can be applied to various types of digital products. For a great digital life, he also played the role of “propagating the wave”. Unfortunately, only the MICRO SD survives. The M2 card is a Sony version of Micro SD, which will eventually be replaced with Micro SD.
Ⅵ SD card specifications