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AM79C970 Datasheet(PDF) 32 Page - Advanced Micro Devices |
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AM79C970 Datasheet(HTML) 32 Page - Advanced Micro Devices |
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32 / 168 page  P R E L I M I N A R Y AMD 1-899 Am79C970 Master Abort The PCnet-PCI controller will terminate its cycle with a Master Abort sequence if DEVSEL is not asserted within 4 clocks after FRAME is asserted. Master Abort is treated as a fatal error by the PCnet-PCI controller. The PCnet-PCI controller will reset all CSR and BCR loca- tions to their H_RESET values. Any on-going network activity will be stopped immediately. The PCI configura- tion registers will not be cleared. RMABORT (bit 13) in the Status register will be set to indicate that the PCnet- PCI controller has terminated its transaction with a mas- ter abort. 18220C-14 FRAME CLK AD IRDY TRDY C/ BE DEVSEL REQ GNT 12345678 ADDR DATA 0000 0111 10 9 PAR PAR PAR DEVSEL is sampled by the PCnet-PCI controller. Figure 12. Master Abort |
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