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AM79C976 Datasheet(PDF) 100 Page - Advanced Micro Devices |
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AM79C976 Datasheet(HTML) 100 Page - Advanced Micro Devices |
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100 / 309 page  100 Am79C976 8/01/00 P R E L I M INARY s 3&, %XV 3RZHU 0DQDJHPHQW ,QWHUIDFH 6SHFLILFD WLRQ 2Q1RZ ZDNHXS s 5:8 KDUGZDUHFRQWUROOHG ZDNHXS All three wake-up events and both control mechanisms support wake-up from any power state including D3cold (PCI bus power off and clock stopped). Figure 44 shows the relationship between these Wake-up events and the various outputs used to signal to the external hardware. )LJXUH 2Q1RZ )XQFWLRQDO 'LDJUDP 2Q1RZ:DNH8S6HTXHQFH The system software enables the PME pin by setting the PME_EN bit in the PMCSR register (PCI configura- tion registers, offset 48h, bit 8) to 1. When a Wake-up event is detected, the Am79C976 device sets the PME_STATUS bit in the PMCSR register (PCI configu- ration registers, offset 48h, bit 15). Setting this bit causes the PME signal to be asserted. Assertion of the PME signal causes external hardware to wake up the CPU. The system software then reads the PMCSR register of every PCI device in the system to determine which device asserted the PME signal. When the software determines that the signal came from the Am79C976 device, it writes to the device’s PMCSR to put the device into power state D0. The soft- ware then writes a 0 to the PME_STATUS bit to clear the bit and turn off the PME signal, and it calls the de- vice’s software driver to tell it that the device is now in st ate D0. T h e sy st em s o ftwar e c an c lea r th e PME_STATUS bit either before, after, or at the same time that it puts the device back into the D0 state. MPDETECT MPPEN_EE PG MPEN_EE MPINT LED WUMI Magic Packet Link Change LCMODE_EE Link Change MPMAT LCDET D R Q Q SET CLR PMAT1 D Q Q SET CLR D Q Q SET CLR D Q Q SET CLR PMAT Pattern Match Input Pattern PME_STATUS PME Status PME_EN MPMAT PME_EN_OVR LCEVENT PME RWU S R Q Q SET CLR POR POR H_RESET POR POR Data from PCI Bus MPPEN_SW MPEN_SW PMAT0 Pattern Match RAM (PMR) PMAT_MODE LCMODE_SW |
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