Offered in Mx8bit, the K9F4G08U0F is a 4G-bit NAND Flash Memory with spare M-bit. The device is offered in V VCC. Its NAND cell. K9G8G08U0A Datasheet, K9G8G08U0A PDF, FLASH MEMORY. K9G8G08U0A datasheet, K9G8G08U0A datasheets, K9G8G08U0A pdf, K9G8G08U0A price, K9G8G08U0A buy, K9G8G08U0A stock.
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The chip you’ve shown is pretty standard compared to what I’ve seen: Some other topologies, such as 3D stacking, also result in odd factors. If it had, for example, pages, then it would be the one I’m searching for. That’s how pretty much all NANDs are done.
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I don’t think so. Each pack has typically 25 wafers and then several packs are put into larger box depending on amounts of wafers. The convention of flash chips having byte blocks goes back into the s; it’s not just “some newer chips”. The factorization of the number of sectors shows that there’s no logic in it, the numbers are chosen to give a round number in GB, not GiB. The error-correction logic doesn’t count in either number.
K9G8G08U0C-SCB0 datasheet & applicatoin notes – Datasheet Archive
While the latter may be very well justified by minimizing overhead of addressing, the former is puzzling for me. Yes, ECC has been around for a long, long time, and thus flash manufacturers do support it.
I’ve actually seen lots of devices that are not only not powers of two, but not even non-power-of-two multiples of power-of-two blocks. Jar Packing for Wafer Jar Packing is made by Samsung Electronics and used by many customers that we deliver the requested die as wafer. I’ve updated the question with an example.
If memory chips used datahseet pages of bytes each datwsheet thandrives would have to store a page worth of bookkeeping information beside each page of data–a massive waste. Sign up or log in Sign up using Google. I have never seen any flash chips with capacity not confined to the strict i.
Row and column addresses already exceed the bus width, and several transfer cycles are used to select a block; they do not fill all 16 bits as well, so there is already some extra space.
It may or may not be a coincidence; but in the question, I ask about flash chips, not flash cards. Email Required, but never shown. Yes, they could make one, but it wouldn’t increase their bottom line. Post as a guest Name. All units are in um 3. There is no practical reason that couldn’t be done. The word is deceit, and it also happens with hard disks. So the silicon usage efficiency is best at 2 n. Although manufacturers recommended using part of the space for ECC, the primary purpose of the space was to facilitate block remapping.
For example, plugging an SD card labeled as ” MB” into my Linux box produces the following message:. I’ve came to this thought after examining some flash drives: They are typically more expensive than the byte block size parts, though, which again points to cost efficiency of silicon being the reason most flash favors power of two. There’s little advantage to supporting sizes between 2 n and 2 n But I’ve also seen SPI-interface flashes where the actual native block size was not a power of two, but actually a bit larger – for example, the AT45DBD has pages that you can set as being either or bytes long.
If you look at how access to it actually works, a decision to designate those extra 16 bits for “out of band” usage would be your decision, not something forced on you by the architecture of the device. Is flash chip capacity really limited to the powers of 2? Many of them, however, do this because they simply have too many bits due to their 3 bit per cell MLC flash.
I wonder what prevents manufacturers from creating such chips: Home Questions Tags Users Unanswered. Data for the WD Caviar Blue drive, but other manufacturers will handle more or less the same numbers: But the capacity of mass storage device is less than that of the flash because of spare blocks which will be used in place of bad blocks, which are present on any new MLC NAND device and are appearing through its life.
Further, in the rush to increase capacity some reliability is exchanged, but fixed with error detection. If you buy a 1TB hard disk and it appears to hold 1 MB, technically you’re not swindled, even when you actually did mean and expected 1 MiB.
Oh, I’m very sorry, my comment should have been much better 3AM, you know I didn’t say it’s not standard, but it is not a power of two. Sometimes – as with those packaged in USB or SD devices it’s easy to assume that the controller you access the memory through is reserving space to map out bad blocks, etc.
I don’t consider it as “extra” or something because: SAMSUNG reserves the right to change the probe program at any time to improve the reliability, packaged device yield, or performance of the product. The error-correction logic in form of ECC codes does not, of course, as it uses OOB area, but error correction which replaces bad blocks with spare ones does count. Sign up using Email and Password. The pack consists of clean paper to wrap the wafer, high cushioned sponge between wafer and hardly fragile plastic box with sponge.
It is not formatting nor partitioning overhead: When the PC writes a logical sector, the page holding data for that sector will not be immediately erased.