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The channel contention access principle of Wi-Fi. The core of Wi-Fi equipment access lies in carrier sense multiple access / collision avoidance (CSMA/CA). This mechanism of listening before speaking has been in use since the first generation of Wi-Fi (802.11) in 1997. However, there were few wireless network devices more than 20 years ago, and no one would consider the network congestion caused by competition when the number of devices increased. The real popularity of Wi-Fi began with Wi-Fi 4 (802.11n) in 2008. It can be said that since then, Wi-Fi has really become the most common form of Internet access for homes and businesses. The number of device models that support Wi-Fi has also increased exponentially.
From April 2020 to June 2020, the demand for cars dropped sharply due to the spread of the COVID-19 epidemic. Automakers purchase parts according to Toyota’s “Just In Time” mode of operation, so, for example, Toyota canceled orders for in-car semiconductors for Denso, its main subcontractor, which canceled orders for in-car semiconductors such as Renesas, which then cancelled subsequent orders for 28nm, which was commissioned by TSMC. Due to the special needs of COVID-19 at home under the epidemic, the production of 28nm semiconductors such as TSMC game consoles and household appliances swarmed in, and the blank production line after the cancellation of car semiconductors was instantly filled with these semiconductors.
System on Chip, referred to as Soc, is also a system on a chip. In a narrow sense, it is the chip integration of the core of the information system, which is to integrate the key components of the system on one chip; in a broad sense, SoC is a micro-miniature system. If the central processing unit (CPU) is the brain, then the SoC is It is the system that includes the brain, heart, eyes, and hands. Academic circles at home and abroad generally tend to define SoC as the integration of microprocessor, analog IP core, digital IP core, and memory (or off-chip memory control interface) on a single chip, which is usually customized or oriented for specific purposes. standard product.
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