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SII3124ACBHU Datasheet(PDF) 84 Page - Silicon image |
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SII3124ACBHU Datasheet(HTML) 84 Page - Silicon image |
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84 / 88 page  PCI-X to Serial ATA Controller Data Sheet Silicon Image, Inc. © 2006 Silicon Image, Inc. SiI-DS-0160-C 84 8 Power Management The following register bits control Power Management in a SiI3124 Port. Register Bits Description Interrupt Status PM Change Bit 3 This bit reports a change in the Power Management mode. It corresponds to the interrupt enabled by bit 3 of the Port Interrupt Enable register. SError W Bit 18 Interrupt Status ComWake Bit 5 This bit reports a ComWake received from the Serial ATA bus. It corresponds to the interrupt enabled by bit 5 of the Port Interrupt Enable register. SControl SPM Bits 15-12 This bit field initiates transitions to/from Partial or Slumber power management states; bit 14 corresponds to ComWake (exit power management); bit 13 corresponds to Slumber mode; bit 12 corresponds to Partial mode. SControl IPM Bits 11-8 This bit field disables transitions to Partial or Slumber power management states; bit 9 corresponds to Slumber mode; bit 8 corresponds to Partial mode. SStatus IPM Bits 11-8 This bit field reports the power management state; ‘0110’ corresponds to Slumber mode; ‘0010’ corresponds to Partial mode. Table 8-1 Power Management Register Bits There are two power management modes: Partial and Slumber. These power management modes may be software initiated through the SControl register or device initiated from the Serial ATA device. Transitions to and from either power management mode generate an interrupt, the Power Management Mode Change Interrupt, which may be masked in the Port Interrupt Enable register (bit 3). Partial/Slumber mode may be initiated by software through the SControl register. By setting the SPM field to either ‘0001’ (Partial) or ’0010’ (Slumber), software causes a PMREQ to the Serial ATA device, which will respond with either a PMACK or PMNAK. If a PMACK is received the Partial/Slumber mode is entered. A PMNAK is ignored; the request remains asserted. The Serial ATA device may initiate Partial/Slumber mode. Software enables the acknowledgement of this request by setting the IPM field in the SControl register to ‘0001’ (Partial), ‘0010’ (Slumber), or ‘0011’ (Partial or Slumber). If enabled, a PMACK will be sent to the device; if not enabled, a PMNAK will be sent. When the request is received and its acknowledgement is enabled, Partial/Slumber mode is entered. Partial/Slumber mode status is reported in the SStatus register (‘0010’/’0110’ in the IPM field). Partial/Slumber mode is cleared by ComWake (asserted when the SPM field is set to ‘0100’). |
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