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PCI6621 Datasheet(PDF) 173 Page - Texas Instruments |
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PCI6621 Datasheet(HTML) 173 Page - Texas Instruments |
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173 / 204 page  8−13 8.19 Power Management Control and Status Register The power management control and status register implements the control and status of the SD host controller. This register is not affected by the internally generated reset caused by the transition from the D3hot to D0 state. See Table 8−14 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 RCU 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: 84h Type: Read/Clear, Read/Write, Read-only Default: 0000h Table 8−14. Power Management Control and Status Register Description BIT FIELD NAME TYPE DESCRIPTION 15 ‡ PME_STAT RCU PME status. This bit defaults to 0. 14−13 DATA_SCALE R Data scale. This field returns 0s when read, because the SD host controller does not use the data register. 12−9 DATA_SELECT R Data select. This field returns 0s when read, because the SD host controller does not use the data register. 8 ‡ PME_EN RW PME enable. Enables PME signaling. 7−2 RSVD R Reserved. Bits 7−2 return 0s when read. 1−0 ‡ PWR_STATE RW Power state. This 2-bit field determines the current power state and sets the SD host controller to a new power state. This field 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 D3hot. ‡ One or more bits in this register are cleared only by the assertion of GRST. 8.20 Power Management Bridge Support Extension Register The power management bridge support extension register provides extended power-management features not applicable to the SD host controller; thus, it is read-only and returns 00h when read. Bit 7 6 5 4 3 2 1 0 Name Power management bridge support extension Type R R R R R R R R Default 0 0 0 0 0 0 0 0 Register: Power management bridge support extension Offset: 86h Type: Read-only Default: 00h |
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