Via circuit of switching power domain parallel interface to normally open power domain parallel interface

The invention discloses a via circuit of a switching power domain parallel interface to a normally open power domain parallel interface. The via circuit comprises a control signal detection circuit and an interface control circuit. A control signal detection module is connected with the switching power domain parallel interface through data, an address bus, control signals, transmission response signals, and handshaking signals. The control signal detection circuit detects reading-writing control signals, and latches effective data and addresses. In the interface control circuit, a response signal is set, and the response signal is sent to the control signal detection module when data transmission is completed, and the interface control circuit controls the handshaking signals of the signal detection module. Through the interface control circuit and the control signal detection circuit, the number of control signals of a normally open voltage domain interface circuit is reduced, the number of level shifters i