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PCI7621 Datasheet(PDF) 174 Page - Texas Instruments |
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PCI7621 Datasheet(HTML) 174 Page - Texas Instruments |
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174 / 298 page  7−14 7.20 Power Management Control and Status Register The power management control and status register implements the control and status of the PCI power-management function. This register is not affected by the internally generated reset caused by the transition from the D3hot to D0 state. See Table 7−17 for a complete description of the register contents. Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Name Power management control and status Type RWC R R R R R R RW R R R R R R RW RW Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Register: Power management control and status Offset: 48h Type: Read/Clear, Read/Write, Read-only Default: 0000h Table 7−17. Power Management Control and Status Register Description BIT FIELD NAME TYPE DESCRIPTION 15 ‡ PME_STS RWC Bit 15 is set to 1 when the PCI7x21/PCI7x11 controller normally asserts the PME signal independent of the state of bit 8 (PME_ENB). This bit is cleared by a writeback of 1, which also clears the PME signal driven by the PCI7x21/PCI7x11 controller. Writing a 0 to this bit has no effect. 14−13 DATA_SCALE R This field returns 0s, because the data register is not implemented. 12−9 DATA_SELECT R This field returns 0s, because the data register is not implemented. 8 ‡ PME_ENB RW When bit 8 is set to 1, PME assertion is enabled. When bit 8 is cleared, PME assertion is disabled. This bit defaults to 0 if the function does not support PME generation from D3cold. If the function supports PME from D3cold, then this bit is sticky and must be explicitly cleared by the operating system each time it is initially loaded. 7−2 RSVD R Reserved. Bits 7−2 return 0s when read. 1−0 ‡ PWR_STATE RW Power state. This 2-bit field sets the PCI7x21/PCI7x11 controller power state and is encoded as follows: 00 = Current power state is D0. 01 = Current power state is D1. 10 = Current power state is D2. 11 = Current power state is D3. ‡ These bits are cleared only by the assertion of GRST. 7.21 Power Management Extension Registers The power management extension register provides extended power-management features not applicable to the PCI7x21/PCI7x11 controller; thus, it is read-only and returns 0 when read. See Table 7−18 for a complete description of the register contents. Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Name Power management extension Type R R R R R R R R R R R R R R R R Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Register: Power management extension Offset: 4Ah Type: Read-only Default: 0000h Table 7−18. Power Management Extension Registers Description BIT FIELD NAME TYPE DESCRIPTION 15−0 RSVD R Reserved. Bits 15−0 return 0s when read. |
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