protocol - muneeb-mbytes/linux_course GitHub Wiki

Serial protocol divided into two types:

• Serial synchronous protocol
• Serial asynchronous protocol - UART

Serial synchronous protocol - SPI protocol SPI Protocol

• Used for longer distance
• Communication done with outside chip.
• Master and slave have different clocks because both are working in different chip.

Limitation

• serial synchronous protocol cannot be used for more distance.

Serial asynchronous protocol - UART

• UART communication happens between single line.
• Full duplex Ccommunication
• UART has start bit and stop bit to indicate when the data transfer done.
• High speed communication protocol
• If distance is more, data loss may happen.
• UART uses 128B/130B encoding for data transmission

Parallel Protocol

• Parallel Synchronous protocol
• Parallel Asynchronous protocol

Parallel Synchronous protocol - APB Protocol

• Half duplex communication
• Working on system clock

Parallel Asynchronous protocol - AXI protocol

• Burst based transaction
• Full duplex Communication