| 摘要 |
PURPOSE: Semiconductor integrated circuit having clock synchronous type circuit and clock non-synchronous type circuit is provided, which si related to a semiconductor integrated circuit formed by mounting, on one chip, a clock synchronous type circuit that operates synchronously with a clock signal and a clock non-synchronous type circuit that operates asynchronously with a clock signal. CONSTITUTION: The two latch circuits(3) are connected in series between the data output node of a clock non-synchronous type circuit(1) and the data input node of a clock synchronous type circuit(2). A switching circuit(4) is connected between the data output node of the clock non-synchronous type circuit(1) and the latch circuit(3). A switching circuit(4) is connected between the latch circuit(3) and the latch circuit(3). A switching circuit(4) is connected between the latch circuit(3) and the data input node of the clock synchronous type circuit(2). Transfer timing determining circuits are arranged in correspondence with the switching circuits(4). The transfer timing determining circuit generates a control signal PSi for controlling the switching circuit(4) on the basis of a clock signal Clock. The transfer timing determining circuit generates a control signal PSo for controlling the switching circuit(4) on the basis of the clock signal Clock. The transfer timing determining circuit generates a control signal PO for controlling the switching circuit(4) on the basis of the clock signal Clock. A read control signal READ for controlling the read operation of reading data from the clock non-synchronous type circuit(1) is input to the clock non-synchronous type circuit(1). This read control signal READ is, for example, generated from the clock signal Clock and synchronous with the clock signal Clock.
|
