Lpddr5, the key technology of intelligent driving

By 2020, the ddr5 test samples launched by SK Hynix and micron have made people look forward to the business prospect of ddr5. For example, the ddr5 of SK Haili has at least twice the memory bandwidth of DDR4 in terms of parameters; The frequency of the memory starts from 3200mhz and can reach 8400mhz at most. From DDR3 to DDR4, the bandwidth increases by 33% (from 1600MHZ to 2133mhz). At the same time, SK Hynix aims to increase the bandwidth of each DIMM by more than 50%.

The introduction of ddr5 into automobile system not only improves the security, but also improves the memory, processing, reliability and performance. Recently, Meguiar emphasized this point. It makes the industry's first low-power ddr5dram memory that meets the key hardware points.

Before delving into the intersection of automotive memory and hardware security, we should first know the three levels of DRAM:

1. Standard DDR: for server, cloud computing, network, laptop, desktop and consumer applications, it supports wider channel width, higher density and different shapes and sizes. DDR4 is currently the most commonly used standard in this category, supporting data speeds up to 3200 MPa. However, once ddr5 is reached, the bandwidth speed is expected to reach 6400 MPa.

2. Graphics DDR: for data intensive applications that require very high throughput, such as graphics related applications and data center acceleration. Switching to any graphics based ddr5, you can enable 3.7gb/s Full HD video files.

3. Low power mobile DDR: for mobile and automotive applications that are very sensitive to area and power consumption. Lpddr provides narrower channel width and several low-power operating states. Lpddr4 and lpdr4x support data rates up to 4267mbps, which are common standards of this kind.

Although this level of security and speed are the main features of memory devices, designers should consider other design features of ddr5. For example, ddr5 has a lower operating voltage VDD, which means less noise immunity. In addition, due to the independent power management in ddr5 embedded integrated circuit, designers will be more flexible in complex automobile design.

• new LPDR5 Classification with ASIL (Meguiar).

Meguiar recently released a new lpddr5 memory, which is intended to improve vehicle safety. Lpddr5 is accompanied by extensive functional safety certification to further reduce risks through system integrators, including ADAS, on-board infotainment system, digital cockpit and machine learning system architecture. In addition, Meguiar also simplifies the system design and speeds up the product launch time of automotive customers. Of course, the equipment meets the vehicle safety integrity level.

• LPDR5 It can solve system and hardware faults and is safer.

Lpdr5 usually includes a security mechanism to detect and control memory errors in operation, which meets the highest security standards.

Meguiar divides the security risks of automotive memory into system failure and hardware failure. The system fault is processed by the memory ECC to detect the classification error in the process of data transmission. Hardware failures must be resolved during the testing and manufacturing phases.

Memory is an important part of any electronic system in applications such as mobile devices, Internet of things, automobiles and cloud data centers. SOC designers must select the appropriate storage technology to provide the necessary performance, capacity, power and area. DDR has become a realistic storage technology, which can be used for various types, including standard DDR and low-power DDR. The latest standards lpdr5 and ddr5 provide higher performance with lower power consumption.LPDR5 Its running speed is up to 6400mbps, low power consumption and multiple Ras functions. Among them, the clock architecture is novel and can simplify timing convergence.

Ddr5dram with DDR rate up to 6400mbps supports higher density, including dual channel DIMM topology, to improve channel efficiency and performance. In the highly monopolized DRAM market, Samsung, micron and SK Hynix compete with each other in the field of lpdr5. Among them, Samsung announced the successful development of the industry's first 10nm 8gblpdr5dram in the first half of 2019, and then successively launched 12gb and 16gblpdr5; Sk Hynix also launched lpdr5 products. However, specification level DRAM is just emerging. In automatic driving, safety is the primary task of all vehicles, especially those equipped with automatic systems. As ddr5 enters the automotive market, various sensors, controllers, switches and doors will flourish because they will operate and transmit data at a faster and safer speed than before.