sequential (59) Line of power source (4)

 https://wodewangzhishime.blogspot.com/2022/06/what-does-he-need.html

.

Ref: https://wodewangzhishime.blogspot.com/2022/06/httpswodewangzhishime_70.html 

.

.

John: Before we start, you're better read the 3 articles below.

Me: OK.

.

1) https://wodewangzhishime.blogspot.com/2022/02/httpswodewangzhishime_80.html

2) https://wodewangzhishime.blogspot.com/2022/02/httpswodewangzhishime_26.html

3) https://kamchihau.blogspot.com/2022/11/impact.html

.

John: In the monde, there're plenty protocol of communications. You might have a look . https://instrumentationblog.com/communication-protocols/ .

Me: OK.

John: For example, RJ45, I2C, USB, SPI, and, so on and on.

Me: OK.

John: Now, we use I2C as an example.

Me: OK.

.

John: At the picture above, do you see that there're 2 chips? They are Chip A and Chip B.

Me: yes,.

John: They use the interface of I2C to connect to each others.

Me: OK.

John: Chip A is master. Chip B is slave. That mean Chip B must use the clock line of Chip A.

Me: OK.

.

Inside Chip A, there're 3 clock line.

1) The clock line of RJ45

2) The clock line of I2C.

3) The clock line of system.

.

John: Then, which clock line does (the register of I2C) choose?

Me: Normally, (the register of I2C) choose the clock line of I2C.

John: However, hackers hack it. It become

.

Subject [the register of I2C]

Interrupt [the clock line of RJ45] <---- Originally, it is the clock line of I2C.

Object [Chip B]

Value [pending]