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AM79C974 Datasheet(PDF) 41 Page - Advanced Micro Devices |
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AM79C974 Datasheet(HTML) 41 Page - Advanced Micro Devices |
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41 / 153 page  P R E L I M I N A R Y AMD 41 Am79C974 Preemption When FRAME is Asserted The central arbiter can take GNT to the Am79C974 con- troller away if the current bus operation takes too long. This may happen, for example, when the Am79C974 controller tries to fill the whole Ethernet transmit FIFO and the target inserts extra wait states for every data phase. When GNT is taken away, the Am79C974 con- troller will finish the current transfer and then immedi- ately release the bus. The Latency Timer in PCI configuration space of the Am79C974 controller is al- ways set to ZERO. The Am79C974 controller will keep REQ asserted to regain bus ownership as soon as pos- sible. 18681A-19 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 Am79C974 controller. Figure 15. Preemption When FRAME is Asserted |
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