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LTR Recommendation for Client DevicesDevices LTR_Active LTR_Act_Idle LTR_Idle CommentsWLAN 60usec 300usec(minimum)LTR_No_Req (unassociated)LTR_MaxPlatLat (associatedand radio off)Device InitiatedEthernet LAN(1Gb orlower)60usec300usec(minimum)LTR_MaxPlatLat (LPI mode)LPI – Low Power Idlemode in IEEE 802.3azstandardDevice InitiatedGraphics 60usec Optional LTR_MaxPlatLat Can be SW guidedClient Storage(e.g. memorycard reader)60usec Optional LTR_MaxPlatLat Can be SW guided+BIOS programs LTR Extended Capability Structure field with LTR_MaxPlatLat (1msec)+These numbers are preliminary. Monitor the following link for updates:http://developer.intel.com/technology/pciexpress/devnet/index.htmLTR value below 60usec will result in increased platform power• Request lower values only when necessary – for short durations16
Agenda• Impact of devices on platform power• Introduction to the power managementextensions – LTR and OBFF• Implementation guidelines for typicaldevices on mobile and desktop platforms• Implementation guidelines for typicaldevices on server and workstationplatforms• Summary• Next steps17
Page 1 and 2: Device Guidelines for PCIExpress* T
Page 3: Agenda• Impact of devices on plat
Page 6 and 7: Agenda• Impact of devices on plat
Page 8 and 9: Latency Tolerance Reporting (LTR)Ac
Page 10 and 11: LTR - Device ImplementationOS Bus D
Page 12 and 13: Optimized Buffer Flush/Fill (OBFF)O
Page 14 and 15: Active State Power Management (ASPM
Page 18 and 19: LTR Recommendation for Server Devic
Page 20 and 21: Implementation Guidelines for OBFFE
Page 22 and 23: Summary• Impact of devices (even
Page 24 and 25: Next Steps• Download the PCI Expr
Page 26 and 27: Legal Disclaimer• INFORMATION IN
Page 28 and 29: 28Backup Slides
Page 30 and 31: Example: WLAN DeviceLTR_Active_Idle

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