The Southbridge releases the Reset signal to the SIO, Northbridge, and other peripherals.
A desktop motherboard power sequence is the strictly ordered and timed delivery of electrical voltages and logic signals required to transition a computer from a "dead" standby state to a fully operational system. This complex "handshake" between the Power Supply Unit (PSU), the Super I/O (SIO) chip, the Platform Controller Hub (PCH), and the CPU ensures that each component receives stable power only after its prerequisite signals are verified. desktop motherboard power sequence pdf
The power sequence ensures voltages come up in a specific order to prevent latch-up or damage to chipsets, CPU, and RAM. The Southbridge releases the Reset signal to the