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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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AM79C970 Folha de dados(PDF) 31 Page - Advanced Micro Devices |
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AM79C970 Folha de dados(HTML) 31 Page - Advanced Micro Devices |
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31 / 168 page  AMD P R E L I M I N A R Y 1-898 Am79C970 Preemption When FRAME is Asserted The central arbiter can take GNT to the PCnet-PCI con- troller away if the current bus operation takes too long. This may happen e.g. when the PCnet-PCI controller tries to fill the whole transmit FIFO and the target inserts extra wait states for every data phase. When GNT is taken away, the PCnet-PCI controller will finish the current transfer and then immediately release the bus. The Latency Timer in PCI configuration space of the PCnet-PCI controller is always set to ZERO. The PCnet- PCI controller will keep REQ asserted to regain bus ownership as soon as possible. 18220C-13 FRAME CLK AD IRDY TRDY C/ BE DEVSEL REQ GNT 12345678 ADDR DATA DATA DATA 0000 0111 9 PAR PAR PAR PAR PAR DEVSEL is sampled by the PCnet-PCI controller. Figure 11. Preemption When FRAME is Asserted |
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