Patent ID: 9111043
Filing Date: 2015-08-18
Classification: G06F

Abstract:
1. A semiconductor device comprising: an HSIC physical layer circuit fixedly connected to another semiconductor device through a bus line; a USB link control unit that operates with a USB function of either a host function or a device function, and link-connects to the another semiconductor device through the HSIC physical layer circuit; a nonvolatile storage unit that stores selection data, the selection data being used to select the USB function with which the USB link control unit operates; and a semiconductor substrate on which the HSIC physical layer circuit, the USB link control unit, and the nonvolatile storage unit are formed, wherein a first state of the selection data indicates selection of the host function and a second state of the selection data indicates selection of the device function, wherein the nonvolatile storage unit is only programmable to either of said first and second states, wherein the nonvolatile storage unit outputs the selection data to the USB link control unit when the semiconductor device is started up and commencing at a first power-on period before the HSIC physical layer circuit becomes operational, wherein the bus line includes a STROBE signal line and a DATA signal line, wherein the HSIC physical layer circuit controls a first power-on state of the STROBE signal line and the DATA signal line to be a same logic state during said first power-on period, and wherein the HSIC physical layer circuit controls a second power-on state of the STROBE signal line and the DATA signal line according to the selection data during a second power-on period.