Хабр Курсы для всех
РЕКЛАМА
Практикум, Хекслет, SkyPro, авторские курсы — собрали всех и попросили скидки. Осталось выбрать!
Те, кто знает, какого это, ждать 15 часов, пока Autodesk Maya кэширует файл размер в 400 Гб, оценят новый вид энергонезависимой памяти 3D XPoint, способной работать в 1000 раз быстрее обычных SSD с NAND памятью.
Пробные поставки продукции на базе технологии 3D XPoint для отдельных заказчиков начнутся уже в этом году.Ну хоть так. А то уже этих «революций» и «переворотов» по несколько штук в неделю, а в коммерческом использовании шиш. Хорошо хоть без графена.
Эта технология до 1.000 раз быстрее и имеет до 1.000 раз более длительный срок службыПравильнее будет писать без разделителя, или с пробелом. Точка ассоциируется как десятичный разделитель.
3D XPoint is a resistance based technology that works by a bulk property change to alter the resistance level of a cell and thus differentiate between a 0 and 1.
… written (i.e. a bulk property change in the memory cell material) or read (allows the current through to check whether the memory cell is in high or low resistance state)
… the voltages are considerably lower than in NAND
unwillingness of Intel and Micron to lift the hood on this new memory technology makes it ripe for speculation. Is it perhaps a resistive RAM (ReRAM) with an in-built select diode allowing for a dense device structure?… Perhaps a twist on phase change memory (PCM)… what memory technology 3D XPoint was closest to, he was told there was no technology as mature as this one… Handy said 3D Xpoint memory is worth noting, but not groundbreaking enough to wake people up in the middle of the night. Alternative memory technologies are generally seeking to replace DRAM or NAND flash
10 раз более высокую плотность размещения компонентов по сравнению с DRAM памятью
The selection device could use:
— Homojunctions polySi p/n junctions
— Heterojunctions – P-CuO/n-InZnO
— Schottky diode – Ag/n-ZnO
— Chalcogenide ovonic threshold switching (OTS) materials
— Mixed ionic electronic conduction (MIEC) materials
For random-access type memories, a 1T1R (one transistor, one resistor) architecture is preferred because the transistor isolates current to cells that are selected from cells that are not. On the other hand, a cross-point architecture is more compact and may enable vertically stacking memory layers, ideally suited for mass-storage devices. However, in the absence of any transistors, isolation must be provided by a "selector" device, such as a diode, in series with the memory element or by the memory element itself.
Overview of ReRAM array structures:
a) MOSFET accessed structure;
b) access-device-free crossbar structure;
c) diode-accessed crossbar structure
In a crossbar design, it is possible to access a single cell in an array by applying the proper potential across the wordline and bitline to which the cell is connected… However, as selected cells are no longer isolated from unselected cells, activating a wordline and a bitline will result in current flow across all the cells in the selected row and column.
Ideally, when we activate a wordline and bitline(s), we want the entire current to flow through the full-selected cell(s) that lies at their intersection(s). For example, in order to SET specific cell(s) in the crossbar array, the selected wordline and bitline(s) are set to V (or Vw ) and 0 respectively, as shown in Figure 3b. Therefore, the write voltage V is fully applied across the full-selected cell(s). However, other cells in the selected row and column(s) also see partial voltage across them. These half-selected cells in the selected row and column leak current through them due to the partial write voltage across them, which is commonly referred to as sneak current.
… Thus, a critical parameter in a crossbar architecture is the ratio of the amount of current flowing through a fully-selected cell fully-selected cell (I f sel_RESET ) to a half-selected cell (I h sel), referred to as nonlinearity (κ). The higher the κ, the lower the sneak current, and the higher the feasibility of a large crossbar array…
Many recent ReRAM prototypes employ a dedicated selector or bi-polar diode in each cell to improve κ, as shown in Figure 2c
...very fundamental difficulty with resistive RAMs (ReRAMs): These devices require a forward current to be programmed to a “1” and a reverse current to be set to a zero. This goes against the ideal crosspoint memory design in which a bit would consist of nothing more than a diode in series with a memory element. By inserting a diode, the current can only run in one direction, so a bit can be programmed or it can be erased, but not both.…
Akifumi Kawahara of Panasonic explain how his company was able to manufacture a crosspoint matrix of ReRAM cells. His team put a very simple device which behaved like two back-to-back Zener diodes directly beneath each memory element. This device’s V/I curve is the graphic for this blog post.
01:26PM EDT — Excuse me, Intel Optane
01:26PM EDT — 3D XPoint SSDs in 2016 released under the Optane brand. Datacenter to ultrabooks
01:26PM EDT — 3D XPoint will also be available via DIMMs for Xeons
01:26PM EDT — 3D XPoint live demo!
01:27PM EDT — Demoing an Optane PCIe SSD
01:27PM EDT — Optane vs. Intel P3700 SSD (Intel's current best SSD)
01:27PM EDT — ~7x better IOps at low queue depths
01:28PM EDT — 76K vs. 10K at QD1
Intel, совместно с Micron Technology, уже в этом году, совершат революционный прорыв в энергонезависимой памяти