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Hello everyone, today we're going to look at the architecture of Apple's T2 chip

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The T2 chip is integrated with the EC

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It has systems inside it,

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and the systems inside it we call the Bridge OS, or firmware

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This firmware is writable, it's upgradable

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For example, in this architecture,

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because of the internal integration of the hard disk controller,

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it can directly manage the four hard disk chips on the mainboard through the PCIE bus,

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and the four hard disks constitute the disk array

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This architecture is drawn with reference to the A1989 model

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The architecture of the T2 chip is almost identical

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It also manages and communicates with the camera through the MIPI bus

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For software to access the camera, it must be authorized by T2

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For CPU or PCH to output sound to the speaker,

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it also needs to be transmitted out through the T2 chip

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To prevent third party software or other rogue software secretly call your camera, or call the microphone

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The T2 chip communicates with audio and speakers through the I2S bus

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And then there's the UART bus here, which is usually used for near-field communication

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Including keyboard, touchpad, touch bar, power IC, charging chip,

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battery power identification, temperature detection, screen identification, light sensing,

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these communications are controlled by T2 chip

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Light sensing refers to ambient light sensing

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This includes fingerprints and CD3215 or CD3217 connected to the Type-C interface,

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which are controlled by T2

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This T2 also has a logic chip and SOC ROM

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The capacity of this SOC ROM is not large, not BIOS

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As long as the T2 chip is used on the mainboard, there is no BIOS chip

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Logic chip, SOC ROM, as well as fingerprint, hard disk, they are bound to the T2 chip

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If we want to replace the T2 chip, we have to replace it with the kit,

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which means we can't just replace the T2 chip,

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we have to replace the fingerprint, the logic chip, and the SOC ROM connected to it

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This is the architecture of the T2 chip

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The eSPI bus is used to communicate with the PCH or CPU

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Some data is communicate with the PCIe bus

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Okay, so this is the architecture of Apple's T2 chip