Via Technologies, Inc.

Hsuan-Yi Wang

Nai-Shung Chang

Sheng-Chang Peng

Jiin Lai

Chun-Yi Wu

Chau-Chad Tsai

Chi-Che Tsai

Jiing Lin

Kuang-Yu Tang

A bus data interface, structure and method for transmitting the data of a PCI bus is disclosed. The bus data interface comprises a high-bit transmitting buffer, a low-bit transmitting buffer, a multiplexer, a strobe generator, and a data distributor. The strobe generator utilizes the bus request signal and bus grant signal to transmit a data strobe signal in response to the PCI clock. According to the rising edge and falling edge of the data strobe signal, the data distributor retrieves data according to the data strobe signal. Further, the invention is compatible with the original PCI bus and allows the PCI bus to transmit data with a dual speed.

Interface, structure and method for transmitting data of PCI bus which uses bus request signal for judging whether a device supporting dual transmission mode

The present invention generally relates to a circuit configuration of a chip and, more particularly to a circuit configuration of a chip with a graphic controller integrated and a method for testing such a circuit configuration, in which a test circuit is employed in a main control module such that a graphic controller is directly connected to a plurality of buses in a testing mode. Thus, the testing of the graphic controller is independent of the main controller module. Moreover, the testing requests are transmitted to the graphic controller by using frequency multiplying modes, and at least one multiplexer and at least one latch are used at the memory end, so that the required pin count for testing is lowered in the present invention.

Circuit configuration of a chip with a graphic controller integrated and method for testing the same

A software-based simulation system is provided, which can provide the combined functionality of a South Bridge test module and a North Bridge test module based solely on either one of the two modules, i.e., either the South Bridge test module or the North Bridge test module without having to use both. This software-based simulation system is characterized in the use of a PCI master modeling circuit and a PCI slave modeling circuit which are capable of simulating the functionality of the North Bridge chipset in the case that only the South Bridge chipset and no North Bridge chipset is included in the simulation system, and are further capable of simulating the functionality of the South Bridge chipset in the case that only the North Bridge chipset and no South Bridge chipset is included in the simulation system.

Software-based simulation system capable of simulating the combined functionality of a north bridge test module and a south bridge test module

The invention provides a method of performing data transfers on a PCI bus between a PCI bus master and a selected device. Wherein, there is a request signal and a grant signal on the PCI bus for a read/write transaction, and during the read/write transaction, the request signal and the grant signal are idle. The method comprises the steps of: (a) driving a first ready signal by the PCI bus master; (b) driving a second read signal by the selected device in response to the first ready signal, which initiates the read/write transaction; (c) using the request signal and the grant signal as a data transfer strobe signal during the write and read transaction, respectively, the data transfer strobe signal has a plurality of clocks; and (d) performing the data transfers on rising and falling edges of the clocks of the data transfer strobe signal.

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Yunlin Hsien, Taiwan

Hsuan-Yi Wang