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Modern cars are becoming more sophisticated by continually integrating additional technologies that lower dependencies on a person’s capability to drive, 在不影响安全的前提下. These systems are called Advanced Driver-Assistance Systems (ADAS), 和 they use a variety of methods, including cameras as “eyes” on the road, that can aid a person when driving.
A lot of effort is being made to lower the latency 和 increase the performance of ADAS systems so they will become even more useful 和 dependable for 司机. Among these efforts is the development of “instant-on” or fast-boot performance that will allow your ADAS system to be ready as soon as you start the car, as well as a quick-reset feature for faster system responsiveness. The need for a fast-boot feature has become increasingly apparent, with the advent of automotive 应用程序 that have hard requirements for responding to comm和s from ECUs over the CAN bus, as well as the system’s ability to immediately feed video to e-mirrors 和 the displays from rear- or surround-view camera systems.
微米 is working with Ambarella to support the fast-boot performance needs of their CV22FS 和 CV2FS AI vision SoCs. These ASIL B-compliant SoCs with functional safety address multiple different automotive 应用程序, such as front-facing monocular 和 stereovision ADAS cameras, in-cabin driver 和 occupant monitoring systems (DMS/OMS), 电子的镜子, as well as computer vision ECUs for L2+ 和 higher levels of autonomy. To enable fast-boot performance, these SoCs support the Xccela™ bus interface, which Ambarella is using to connect with 微米’s AEC-Q100 compliant Xccela Flash memory on its CV22FS/CV2FS SoC development board.
Xccela Flash is the latest NOR product at 微米 that supports the x1 SPI bus, 和 the Xccela bus interface which is a JEDEC xSPI-compliant Octal I/O interface developed 和 promoted by the Xccela Consortium. This advanced memory bus can provide a maximum clock frequency of 200MHz in double data rate (DDR) mode along with the data strobe, 或400MB/s读吞吐量.
Comparing the read performance of Xccela Flash with the other Flash memories in the graph below, Xccela Flash outshines the others by almost 5x within the range of 16Bytes-256Bytes per fetch during cache line fills.
To illustrate the fast boot performance of 微米’s Xccela Flash on an actual system, Ambarella has done measurements on its CV2FS AI vision SoC board comparing Xccela Flash with another boot solution on the same board, 例如美光的串行NAND.
The above graph shows that the 微米’s Xccela Flash interface, even in SDR (Single-Data Rate) mode, 有3个.28x faster boot performance than 微米’s Serial NAND, running on the Ambarella CV2FS SoC development board.
Ambarella has successfully demonstrated that they can achieve fast-boot performance on their CV2FS/CV22FS development board using 微米’s Xccela Flash. 请查看http://www.ambarella.com/products/automotive/ for more information about Ambarella’s CV2FS 和 CV22FS AI vision SoCs with functional safety, 和 http://www.微米.com/products/nor-flash/xccela-flash for more information about 微米’s automotive-grade Xccela Flash.
