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Altera_Forum
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15 years ago

uart code

What does the following code do? case(SW[3:0]) 4'b0000: UART_TXD = RS422_1_TX; 4'b0001: UART_TXD = RS422_2_TX; 4'b0010: UART_TXD = RS422_3_TX; 4'b0011: UART...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi:

This is an 16 to 1 multiplexer or mux. Based on the 4-bit selection term SW, the output is connected to the input where SW matches the case term 4'b0000, 4'b0001 etc.

So if SW = 4'b0010, the output UART_TXD = input RS422_3_TX.