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AM79C970A датащи(PDF) 51 Page - Advanced Micro Devices |
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AM79C970A датащи(HTML) 51 Page - Advanced Micro Devices |
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51 / 219 page ![]() P R E L I M I N A R Y AMD 51 Am79C970A Master Initiated Termination There are three scenarios besides normal completion of a transaction where the PCnet-PCI II controller will ter- minate the cycles it produces on the PCI bus. Preemption During Non-Burst Transaction When the PCnet-PCI II controller performs multiple non-burst transactions, it keeps REQ asserted until the assertion of FRAME for the last transaction. When GNT is removed, the PCnet-PCI II controller will finish the current transaction and then release the bus. If it is not the last transaction, REQ will remain asserted to regain bus ownership as soon as possible. 19436A-23 FRAME CLK AD IRDY TRDY C/ BE DEVSEL REQ GNT 1 234567 BE 0111 PAR PAR DEVSEL is sampled PAR DATA ADDR Figure 20. Preemption During Non-Burst Transaction |
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