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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM79C970A датащи(PDF) 207 Page - Advanced Micro Devices |
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AM79C970A датащи(HTML) 207 Page - Advanced Micro Devices |
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207 / 219 page  AMD D-3 Am79C970A C7: After filling the second buffer and performing the last chance lookahead to the next descriptor, the PCnet-PCI II controller will write the status and change the ownership bit of descriptor number 2. S6: After the ownership of descriptor number 2 has been changed by the PCnet-PCI II controller, the next driver poll of the 2nd 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 PCnet-PCI II controller will perform data DMA to the last buffer, whose pointer is pointing to ap- plication space. Data entering the last buffer 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 PCnet-PCI II 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 application 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 PCnet- PCI II controller. |
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