Understanding Active-Low Resets in HDL Design
In HDL design (such as Verilog or VHDL), an active-low reset means the reset signal is enabled when it is low (logic 0). It is widely used in both ASIC and FPGA designs for several practical and electrical reasons: 1. Electrical Stability Logic low (0 volts, GND) is generally more stable and noise-immune than logic high (VCC). During power-up, signals tend to default to low due to internal pull-downs or the absence of a valid voltage, so using an active-low reset ensures that the system starts in a known, reset state. ...