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@ -16,18 +16,25 @@ An IDE ( Integrated Development Environment) is used for programming the PCB des
# Introduction to FT2232H
The serial port of the computer usually meets RS-232 standard. It has signal voltage swing of around -13 to +13V. The PCB design uses TTL serial (Transistor-Transistor logic) which has signal voltage level between 0 and VDD ( 3.3V/1.8V). A common communication protocol is needed for data transfer, hence FT2232H is used for converting USB to serial converter.
For the data transfer from host to the target (board), we connect USB cable ( USB type A to the PC and Type B to the board). USB has 4 signals, 5V power supply signal, ground and 2 data signals(D+ and D-).
![1](https://user-images.githubusercontent.com/74853558/99901951-50832300-2ce0-11eb-83eb-0b9878771b1e.jpg)
The data is transferred from these two data lines using NRZI encoding.
![2](https://user-images.githubusercontent.com/74853558/99904990-128ffa00-2cf4-11eb-8bde-f9693f8e3624.jpg)
According to USB communication protocol, data is sent through packets. It consists of 3 common packets.
![3](https://user-images.githubusercontent.com/74853558/99904992-13c12700-2cf4-11eb-96e3-813c6a7b75de.jpg)
![4](https://user-images.githubusercontent.com/74853558/99904993-1459bd80-2cf4-11eb-8905-544269d66b9f.jpg)
Data is sent through endpoint buffers within the device.
![5](https://user-images.githubusercontent.com/74853558/99904994-14f25400-2cf4-11eb-9d85-3402415096fe.jpg)
![6](https://user-images.githubusercontent.com/74853558/99905235-a57d6400-2cf5-11eb-9f23-9140bd84b50f.jpg)
![7](https://user-images.githubusercontent.com/74853558/99905237-a7472780-2cf5-11eb-8387-13a4a12ac96b.jpg)