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Siemens Solid Edge ST5 V105.00.00.102 ENG 32bit 64bit.torrent



 


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The present invention relates to a semiconductor integrated circuit device, and more particularly to a semiconductor integrated circuit device capable of performing asynchronous access, that is, read and write accesses at an external device at an arbitrary timing. Asynchronous access control for memory has been utilized in the prior art in order to realize high-speed accesses. For example, in synchronous dynamic random access memories (SDRAMs), the synchronous operation is achieved by using an internal clock. The SDRAMs operate at a clock frequency of several tens MHz, although the operation speed of the devices is generally improved. This operation speed is not sufficient for high-speed applications, such as graphics processing, since the clock frequency of 50 MHz to 100 MHz required in the graphics processing is not practical. On the other hand, in asynchronous dynamic random access memories (ADRAMs), read and write accesses are conducted at an external device at an arbitrary timing. As a typical conventional example, the specification of a write access is disclosed in Japanese Patent Laid-Open No. 4-262773. According to the prior art, when a write access request from an external device occurs, a write acknowledge signal (WEN signal) is generated at a write address at which data are to be written, and is input to an address transition detection circuit (ATD circuit). When the WEN signal transitions from a high level to a low level, an access is enabled. The ATD circuit disables the write access when it detects an address transition of an address at which data are to be read out, and when a write access request does not occur within a predetermined period of time from the transition of the WEN signal, thereby inhibiting the write access. However, in the above-described prior art, the ATD circuit is operated only in response to the WEN signal and the address transition detection cannot be performed by using an internal clock. Therefore, the control of the read and write accesses according to a control clock of the device is not guaranteed. The present invention has been achieved in view of the above, and an object of the invention is to provide a semiconductor integrated circuit device capable of conducting read and write accesses at an external device at an arbitrary timing, and enabling high-speed access. In order to attain the above object, according to a first aspect of the present invention, there is provided a semiconductor

 

 

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Siemens Solid Edge ST5 V105.00.00.102 ENG 32bit 64bit.torrent

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