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AM79C978 Datasheet(PDF) 39 Page - Advanced Micro Devices |
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AM79C978 Datasheet(HTML) 39 Page - Advanced Micro Devices |
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39 / 261 page  Am79C978 39 Figure 6. Slave Write Using Memory Command Expansion ROM Transfers Since the Am79C978 device does not have expansion ROM capabilities, PCI configuration offset must be set to 30H = 0. During the boot procedure, the system will try to find an Expansion ROM. A PCI system assumes that an Ex- pansion ROM is present when it reads the ROM signa- ture 55H (byte 0) and AAH (byte 1). Slave Cycle Termination There are three scenarios besides normal completion of a transaction where the Am79C978 controller is the target of a slave cycle and it will terminate the access. Figure 7. Expansion ROM Read FRAME CLK AD IRDY TRDY C/BE DEVSEL STOP PAR ADDR 0111 PAR 1 2345678 10 9 11 DATA PAR BE 22206B-9 FRAME CLK AD IRDY TRDY C/BE DEVSEL STOP PAR ADDR CMD PAR 1 2345 48 49 50 51 DATA PAR BE DEVSEL is sampled 22206B-10 |
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