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AM79C970 数据表(PDF) 43 Page - Advanced Micro Devices |
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AM79C970 数据表(HTML) 43 Page - Advanced Micro Devices |
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43 / 168 page  AMD P R E L I M I N A R Y 1-910 Am79C970 Slave I/O Write The Slave I/O Write command is used by the host CPU to write to the PCnet-PCI’s CSRs, BCRs and EEPROM locations. It is a single cycle, non-burst 16-bit or 32-bit transfer which is initiated by the host CPU. The typical number of wait states added to a slave I/O write access on the part of the PCnet-PCI controller is 6 to 7 clock cycles, depending upon the relative phases of the inter- nal Buffer Management Unit clock and the CLK signal, since the internal Buffer Management Unit clock is a di- vide-by-two version of the CLK signal. The PCnet-PCI controller will not produce Slave I/O write commands while being a bus master. 18220C-21 FRAME CLK AD IRDY TRDY C/ BE 12345678 ADDR DATA 0011 BE's 910 11 PAR PAR PAR STOP DEVSEL Figure 19. Slave I/O Write |
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