Xilinx 7 Series User Manual

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Xilinx 7 Series User Manual Manual pdf 131 page image

7 Series FPGAs GTP Transceivers User Guide www.xilinx.com 131UG482 (v1.9) December 19, 2016RX Out-of-Band SignalingRX Out-of-Band SignalingFunctional DescriptionThe GTP transceiver receiver provides support for decoding the out-of-band (OOB) sequencesdescribed in the Serial ATA (SATA) and Serial Attach SCSI (SAS) specifications and supportsbeaconing described in the PCI Express specification. GTP transceiver receiver support forSATA/SAS OOB signaling consists of the analog circuitry required to decode the OOB signal stateand state machines to decode bursts of OOB signals for SATA/SAS COM sequences.The GTP transceiver receiver also supports beacons that are PCI Express compliant by usinginterface signals defined in the PHY Interface for the PCI Express (PIPE) Specification. The FPGAlogic decodes the beacon sequence.Ports and AttributesTable 4-6 defines the OOB signaling related ports.Table 4-7 defines the OOB signaling attributes.Table 4-6: RX OOB Signaling PortsPort Dir Clock Domain DescriptionRXOOBRESET In Async Reserved. Tie to GND.RXCOMINITDET Out RXUSRCLK2 Indicates reception of the COMINITsequence for SATA/SAS.RXCOMSASDET Out RXUSRCLK2 Indicates reception of the COMSASsequence for SAS.RXCOMWAKEDET Out RXUSRCLK2 Indicates reception of the COMWAKEsequence for SATA/SAS.RXELECIDLE Out RXUSRCLK2 This output indicates the status of OOB signaldetection and is only valid for PCIe,SATA/SAS, and protocols/applications usingOOB. In these cases, the OOB circuit must bepowered on.0 : Activity is seen on the receiver1 : No activity is seenFor non-OOB protocols,RXELECIDLEMODE[1:0] must be set to2'b11. RXELECIDLE will output a static1'b0 and in this case does not indicate signaldetection status.RXELECIDLEMODE[1:0] In Async Input signal to control the behavior ofRXELECIDLE.2'b00: RXELECIDLE indicates the statusof the OOB signal detection circuit. Use thissetting for PCIe, SATA/SAS, andprotocols/applications using OOB. In thesecases, the OOB circuit must be powered on.2'b11: RXELECIDLE outputs a static 1'b0.Use this setting for non-OOB protocols.Send Feedback