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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM79C971VCW датащи(PDF) 239 Page - Advanced Micro Devices |
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AM79C971VCW датащи(HTML) 239 Page - Advanced Micro Devices |
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239 / 265 page  Am79C971 D-3 tus and change the ownership bit of descriptor number 2. S6 After the ownership of descriptor number 2 has been changed by the Am79C971 controller, the next driver poll of the second descriptor will show ownership granted to the CPU. The driver now copies the data from buffer number 2 into the middle section of the application buffer space. This operation is interleaved with the C7 and C8 operations. C8 The Am79C971 controller will perform data DMA to the last buffer, whose pointer is pointing to application space. Data entering the last buff- er will not need the infamous double copy that is required by existing drivers, since it is being placed directly into the application buffer space. N2 The message on the wire ends. S7 When the driver completes the copy of buffer number 2 data to the application buffer space, it begins polling descriptor number 3. C9 When the Am79C971 controller has finished all data DMA operations, it writes status and changes ownership of descriptor number 3. S8 The driver sees that the ownership of descriptor number 3 has changed, and it calls the appli- cation to tell the application that a frame has arrived. S9 The application processes the received frame and generates the next TX frame, placing it into a TX buffer. S10 The driver sets up the TX descriptor for the Am79C971 controller. |
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