An integrated expansion bus bridge is disclosed that couples the traditional ISA (Industry Standard Architecture) data transfer bus to the USB (Universal Serial Bus), which was implemented in the external placement of a ISA data acquisition card. The main transfer function was achieved by the chip of Cypress, EZ-USB AN2131Q, and the performance of the chip, implementation of driver program development, firmware design and application program communication are presented in detail. The advanced performance of USB with Hot Plug In, Plug and Play, easily to expand and engrossing less system resource was shown in the system. Such technology can also be extended efficiently in the field of industry measurement and control, where the ISA bus peripheral card has a wide application.
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