To understand ULPS, one must first understand MIPI DSI. MIPI DSI is the industry-standard interface used to transfer video and command data from a host processor (SoC/Application Processor) to a display driver IC (DDIC). It is based on a high-speed serial architecture similar to PCI Express or SATA but optimized for mobile.
The MIPI ULPS specification offers several key features that make it an attractive solution for power-sensitive applications: mipi ulps
Exiting ULPS is elegantly simple: the transmitter sends a (e.g., a “Mark-1” state followed by a high-speed start-of-packet). The receiver sees this as an abrupt change on the otherwise static lines and immediately fires up its PLL and termination. Wakeup time is typically <1 ms , often just 20–100 µs — fast enough for frame-by-frame power gating in camera or display applications. To understand ULPS, one must first understand MIPI DSI