SFF-8449 - HD MANAGEMENT INTERFACE v1.1

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Development *** THIS IS NOT A FINAL DRAFT *** SFF-8449 Rev 1.1parameter will allow the fixed side to determine if it has adequate power allocatedprior to application of power to the Vact pins.Table 7. Reduced Power Consumption LevelsAdvanced Low Power Mode Declared Maximum Power Consumption(Byte 110, bits 7-6)00 Advanced Low Power Mode Not supported01 1W10 0.75W11 0.5WNote, free-side power levels specified for 3.3V level on both Vact inputs.Additional power savings can be obtained by reducing the Vact input voltage level.The minimum operating voltage is specified by bits 4-3 of byte 110.Minimum OperatingVoltageTable 8. Minimum Operating VoltageDeclared Minimum OperatingVoltage00 Not Supported (Default is 3.3V)01 2.5V10 1.8V11 Reserved5.6 Power Supply Filtering NetworkThe following fixed side power supply filtering network is recommended for the Vmanand both Vact pins. Since the two free side connections to Vact may be electricallyisolated a separate network is recommended for each Vact pin.Optional :Vman maybe switchedper portVman22 uF0.1uF1uH22uF0.1uFTo Vman pinof externalMini SAS HD4x ConnectorOptional :Support foractive cablesoptionalOptional :Vact maybe switchedper portVact22uF1uH0.1uF22uF0.1uFTo Vact pins ofexternal MiniSAS HD 4xConnectorHD Management Interface Page 16
Development *** THIS IS NOT A FINAL DRAFT *** SFF-8449 Rev 1.15.7 Squelch5.7.1 RX SquelchThe receiver data output shall be squelched or disabled when the optical inputsignal is equal to or less than the level required to assert LOS. See table TBD foroptical signal level. The output impedance levels shall be maintained while thedifferential voltage swing shall be less than 50 mVpp.In normal operation the default case has Rx Squelch active. Rx Squelch can bedeactivated using Rx Squelch Disable through the 2-wire serial interface. Rx SquelchDisable is an optional function.5.7.2 TX Squelch (optional)If the differential peak-to-peak electrical input signal becomes equal to or lessthan 50 mVpp, the transmitter optical output shall be squelched or disabled and theassociated TxLOS (loss of input) flag set. When squelched, the transmitter OMA shallbe less than or equal to -26 dBm and when disabled the transmitter power shall beless than or equal to -30 dBm.By default, Tx Squelch shall be active. Tx Squelch can be deactivated using TxSquelch Disable through the 2-wire serial interface. Tx Squelch Disable is anoptional function.HD Management Interface Page 17
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SFF-8449 - HD MANAGEMENT INTERFACE v1.1

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