The first Apple Silicon chip used in the new Mac device M1, implement the first custom master to support USB4 and ThunderBolt 3, and provide the world's first system in accordance with the USB4 specifications. And it's worth noting that apple pioneered the launch of intel's 11th generation Tiger Lake processor, which is available for laptops.
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The 1.0 version of USB4 was released on August 29, 2019. Unlike previous USB protocol standards, USB4 requires usb-c port and USB PD support for charging. Compared with USB 3.2, it allows the establishment of DisplayPort and PCI Express tunnels.
One of the important reasons why Apple can provide thunderbolt 3 and USB4 on M1 chip is that Intel has gradually opened up the technology related to USB4. And Apple's M1 was introduced before Intel finished supporting the new standard chip, which is a bit surprising.
Thunderbolt was originally developed by Intel in collaboration with Apple, and was originally named Light Peak". which was originally intended to be a modern optical alternative to the FireWire, a standard developed by the Apple in the early 1990s, but not widely adopted by the PC industry.
But a decade later, Intel's thunderbolt seems to have suffered the same fate as FireWire: Apple enthusiastically adopted thunderbolt on its MAC, but its popularity on general-purpose PCs was limited, and its desire to promote the latest technology was reduced.
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