Absolute excess performance? DDR4 memory development technology analysis

DDR4: The last chance to develop opportunities?

We know that the gradual development of DDR3 memory has become the current mainstream choice, and now the highest performance has reached DDR3-2133. DDR4 memory will appear next year. The data transmission rate is expected to jump from 1600 to reach a level of 4266. Twice as DDR3. In many people's opinion, memory has rarely brought much help to the performance of the computer. Is DDR4 memory excessive in performance and it has become a dead end? It is still not easy to say that, in any case, technology must always move forward.

Today we have seen foreign media discuss the development of DDR4 memory. Interested friends can learn through the following documents.

Previously, the JEDEC Solid State Technology Association officially announced the key technologies for future DDR4 memory standards. It is expected that by the middle of 2012, DDR4 memory will have higher performance and lower power consumption.

DDR4 technology features a comprehensive display D-DR4 for future server, notebook, desktop, consumer electronics product innovation design, and has a lot of new technical features, the first transfer rate, DDR4 will have 1.6 GT / s to 3.2 GT / s The speed, while the current DDR3 is 1.6 GT/s. At the same time, DDR4 also includes DQ bus, higher 2667 Mhz data transmission rate, bank group structure, integrated VrefDQ and enhanced training mode, and so on.

The bank group structure is an 8n prefetch group structure. It can use two or four bank groups. This allows DDR4 memory to be individually activated, read, written, or refreshed for each bank group. Higher memory and bandwidth.

At the same time, in terms of voltage, DDR4 has also been adjusted. It is expected that its VDDQ voltage will be 1.2V, and will be further reduced in the future.

In addition to the following features will be used:

Provides three data widths: x4, x8, and x16

· New JEDEC POD12 interface standard (working voltage 1.2V)

Differential Signaling (Differential Signaling Technology)

New termination scheduling: In DDR4 DQ bus can be transferred to terminate to VDDQ, which can also guarantee stability in case of low VDD voltage. Normal and dynamic ODT: Improved ODT protocol, and the new Park Mode can be used to allow Normal termination and dynamic inhalation termination, without the need to drive the ODT Pin.

The burst length and burst stop length are 8 and 4 respectively

• Data Masking • DBI: Reduces Power Consumption and Improves Data Signal Integrity • New data bus CRC technology can perform error detection during transmission, especially when writing to non-ECC memory.

New CA Parity and DLL Shutdown Mode Support for Command and Address Bus To further promote and adopt the DDR4 standard, JEDEC intends to hold a DDR4 Technical Workshop meeting after the standard is announced. More information will be officially announced later.

DDR4 memory power control is more reasonable DDR4 Although the performance is improved, but in terms of power consumption, it is still relatively good control, which gives future notebooks and other programs can bring a longer battery life.

Looking to DDR4 memory development opportunities Back to the original topic, can DDR4 bring us real benefits and benefits?

Obviously, in the future, AMD's "Graphics Core Next" GPU will have X86 memory addressing features. In other words, it can call system memory like a CPU. The CPU accesses memory through the MMU memory controller, and the GPU implements memory calls through the IOMMU. This new technology allows system devices to address in virtual memory, which is to map virtual memory addresses to physical memory addresses, so that physical devices can work in a virtual memory environment. This can help the system expand the memory capacity and improve performance. Therefore, the future will benefit from the high bandwidth of DDR4 memory.

At the same time, AMD's next-generation GPUs also have 64bit x86 pointers, Page faults, address translation caches, and memory allocation functions. The operating system will also provide full service for CPU and GPU memory calls. This high-speed memory is particularly important, otherwise it will bring a big bottleneck in system performance.

Overall, DDR4 memory still has room for its future development. Its development depends on the emergence of new technologies for processors and graphics cards. Otherwise, DDR3 memory is currently sufficient.