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DM562P 数据表(PDF) 32 Page - Davicom Semiconductor, Inc. |
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DM562P 数据表(HTML) 32 Page - Davicom Semiconductor, Inc. |
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32 / 48 page  DM562P V.90 Integrated Data/ Fax/Voice/Speakerphone Modem Device Single Chip with Memory Built in 32 Final Power Management Control/Status(Xxxxxx54h~PMCSR) 0 R/W R/W R/W 0 0 0 0 0 0 0 000 0 0 1 2 15 8 7 9 14 PMCSR Offset=54H Bit Default Type Description 31:16 0000h RO Reserved 15 0 R/C _WR PME_Status This bit is set when the function would normally assert the PME# signal independent of the state of the PME_En bit. Writing a “1” to this bit will clear it. This bit defaults to “0” if the function does not support PME# generation from D3(cold). If the function supports PME# from D3(cold) then this bit is sticky and must be explicitly cleared by the operating system each time the operating system is initially loaded. 14:9 000000 RO Reserved. It means that the DM6588 does not support reporting power consumption. 8 0 RW _WR PME_En Write “1” to enables the function to assert PME#, write “0” to disable PME# assertion. This bit defaults to “0” if the function does not support PME# generation from D3(cold). If the function supports PME# from D3(cold) then this bit is sticky and must be explicitly cleared by the operating system each time the operating system is initially loaded. 7:2 000000 RO Reserved 1:0 00 RW _WR _RD Power State. This two bits field is both used to determine the current power state of a function and to set the function into a new power state. The definitionis given below. 00 : D0 11 : D3(hot) PCI function power management state The DM6588 supports PCI function power states D0, D3(hot), D3(cold). Additional PCI signal PME# to pin A19 of the standard PCI connector. PME Context PME (power Management Event) context is defined as the functional state information and logic required to generate power management events(PMEs), report PME status, and enable PMEs. For MODEM, PME context consists of PME_En bit, PME_Status bit , Ring Detect ,and Ring to PME circuit. PCI MODEM Power Management Operation During a true power-on situation (no auxiliary and normal power), PME_En = 0 to avoid to assert PME#. When assert RST#, the pci configuration space is set to default value except PME context which must preserve. Version: DM562P-DS-F01 February 02, 2004 |
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