The ECE1200 is a device designed to implement a Bridge function from an eSPI-configured Intel Chipset to a legacy downstream system, providing Master interfaces for an LPC bus, Serial IRQ and CLKRUN# features. The ECE1200 is directly powered by two Suspend (S5) supply planes, at 3.3V and 1.8V nominal. The 1.8V supply is provided on two sets of pins: VTR18 for I/O pins, and VTR18CORE for internal logic. The 3.3V supply VTR33 is for 3.3V I/O pins only. The ECE1200 senses a Runtime power plane (VCC) using the pin LPCEN, which is intended to come from the PCHPWROK signal supplied from the system. It uses this to emulate VCC-powered functionality on the appropriate pins in order to avoid backdrive in the system.