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|05-04-2012, 03:08||#1 (permalink)|
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Join Date: Oct 2005
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this is some information about eMMC for some phone for users who have problems with it .
when you have eMMC chip error on Resurrection that's mean it's dead or not detected and not riffbox fault . it's hardware problem .
eMMC describes an architecture consisting of an embedded storage solution with MMC interface, flash memory and controller, all in a small ball grid array (BGA) package.
Embedded MultiMediaCard (e-MMC) e-MMC/Card Product Standard, High Capacity, including Reliable Write, Boot, Sleep Modes, Dual Data Rate, Multiple Partitions Supports and Security Enhancement.
16-Gbyte flash complies with eMMC standard
The THGAM0Gxxxx series of embedded NAND flash memory chips complies with the MultiMediaCard Association (eMMC) interface standard. The devices provide 1 to 16 Gbytes in a single package, and their MMC Version 4.2 controller handles block management, error correction, and driver software.
The FBGA169-packaged 16-Gbyte device combines eight 2-Gbyte chips, fabricated using a 56-nm process, and a controller chip. The devices write at 6 Mbytes/s and read at 15 Mbytes/s. (8-Gbyte model, $155 ea/sample qtysamples available now for 8 Gbytes, June for 16 Gbytes, others 4th qtr.)
Today's fastest and most demanding embedded applications, such as multi-functional smartphones,
PMPs, and tablet computers, require equally capable memory management solutions to provide a rich end-user experience.
Such devices most commonly employ flash memory for content storage.
Typically, flash memory is controlled by a dedicated controller that supervises data reads and writes, and operates under the control of the application's CPU. However, with developments in semiconductor technologies, memory densities are advancing at rapid rates, resulting in memory chips with ever-increasing capacities and making it difficult to keep the controller off the flash memory die. To maintain the required data rates and throughputs for high-density chips designed to store high-resolution video and provide enhanced storage capabilities, the eMMC standard was developed.
eMMC is a standard for embedded memory devices that contain not only a data storage element (such as NAND flash memory), but also a controller for the storage element integrated on the same silicon die. This results in several advantages, such as reduced development time and easier integration of the memory block in the overall system. Ultimately, this leads to a much shorter time-to-market for the end product.
The eMMC solution consists of three components - the MMC (multimedia card) interface, the flash memory, and the flash memory controller - and is offered in the industry-standard BGA package. The MMC System Specification v4.41 and JEDEC BGA packaging standards together define the finer points of the eMMC solution.
The following illustration shows technology areas where eMMC solutions will excel.
Standard-cell library offerings
With interface speeds of up to 52MB/s, configurable bus widths of x1, x4, or x8, and interface voltages of either 1.8V or 3.3V, eMMC is designed to provide fast, reliable, and scalable performance.
The flexibility of the industry-standard architecture of the eMMC solution means that designs for mass-storage applications (such as external HDDs) for portable consumer electronic products are greatly simplified. The eMMC interface design allows a host system to access all major types of mass-storage memory devices, such as embedded memory (eMMC-based memory itself), SD/MMC memory cards, and HDDs (using the "ATA on MMC" specification, making it easier for devices such as mobile handsets containing MMC technology to use the larger capacities of small form-factor hard drives) with a single common MMC Interface Protocol Bus.
Development stages for regular NAND flash-based product
For a product using NAND memory, any changes in the chipset, operating system (OS), or the NAND memory requires changes to be made in the Flash Translation Layer (FTL), which in turn, requires testing the changes at the NAND level, significantly increasing delays for product level testing.
Compared to this, when eMMC is used, intermediate changes need not be tested, since the MMC interface takes care of everything. The following illustration shows the elegance of this solution.
This design also makes it possible to select suppliers for subcomponents from a wider base, which results in increased revenues with lower times-to-market.
The future for eMMC is moving towards its integration and deployment with a new architecture (presently under development) - eMCP. eMMC eliminates the need to develop interface software for all types of NAND memory by integrating the embedded controller into the memory chip and providing an easy-to-use memory solutions package for high-speed data transmissions by devices, such as mobile phones. It also eliminates the need for a memory expansion slot by stacking several memory functions vertically, resulting in a very small footprint for the memory devices.
The following illustration shows how this stack-up works to increase and improve the memory densities of devices.
moviMCP integration with eMMC
As an example, eMCP can be deployed to store the code for an application in the SLC NAND/NOR and DRAM memory, whereas the data can be stored in the eMMC memory in a device.
The latest mobile devices are expected to contain bootable eMMC modules, allowing the device's operating system to partition and format the memory modules as needed, and then boot the device off the modules. Designs are also moving towards a unified, hybrid architecture (supporting both SLC and MLC memory), as illustrated below.
Migration towards a hybrid architecture for SLC and MLC memory
By adopting eMMC, manufacturers stand to significantly gain from simpler and faster product designs, qualification processes, and a much shorter overall time-to-market.
The next illustration shows the BGA packages that Samsung eMMC memory is available in.
Specifications for Samsung's eMMC chips
The key benefits of using Samsung's eMMC memory solutions include:
The key application areas for Samsung's eMMC memory include:
eMMC is the next big step in memory technology, especially for the mobile platform. Samsung's worldwide technology leadership in memory and expertise in the semiconductor segment will ensure that customers remain ahead at every single step of this exciting journey.
The Following 4 Users Say Thank You to allal123 For This Useful Post:
|08-28-2012, 11:29||#4 (permalink)|
Join Date: Dec 2011
Location: Sofia, Bulgaria
Thanked 4 Times in 4 Posts
Thanks for detailed explanation.
Is anybody can suggest reliable eMMC chips supplier for servicing purposes of mobile devices with malfunctioning eMMC ?
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