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USB2503 データシート(PDF) 30 Page - SMSC Corporation |
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USB2503 データシート(HTML) 30 Page - SMSC Corporation |
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30 / 46 page  USB 2.0 High-Speed 4-Port Hub Controller Datasheet Revision 1.92 (05-08-07) 30 SMSC USB2514 DATASHEET 4.3.1.27 Register F8h: Boost_4:0 (Reset = 0x00) 4.3.1.28 Register FAh: Port Swap (Reset = 0x00) BIT NUMBER BIT NAME DESCRIPTION 7:6 BOOST_IOUT_4 Upstream USB electrical signaling drive strength Boost Bit for Downstream Port ‘4’. ‘00’ = Normal electrical drive strength ‘01’ = Elevated electrical drive strength (+4% boost) ‘10’ = Elevated electrical drive strength (+8% boost) ‘11’ = Elevated electrical drive strength (+12% boost) 5:4 BOOST_IOUT_3 Upstream USB electrical signaling drive strength Boost Bit for Downstream Port ‘3’. ‘00’ = Normal electrical drive strength ‘01’ = Elevated electrical drive strength (+4% boost) ‘10’ = Elevated electrical drive strength (+8% boost) ‘11’ = Elevated electrical drive strength (+12% boost) Note: “Boost” could result in non-USB Compliant parameters (one example would be Test J/K levels), the OEM should use a ‘00’ value unless specific implementation issues require additional signal boosting to correct for degraded USB signalling levels. 3:2 BOOST_IOUT_2 Upstream USB electrical signaling drive strength Boost Bit for Downstream Port ‘2’. ‘00’ = Normal electrical drive strength ‘01’ = Elevated electrical drive strength (+4% boost) ‘10’ = Elevated electrical drive strength (+8% boost) ‘11’ = Elevated electrical drive strength (+12% boost) Note: “Boost” could result in non-USB Compliant parameters (one example would be Test J/K levels), the OEM should use a ‘00’ value unless specific implementation issues require additional signal boosting to correct for degraded USB signalling levels. 1:0 BOOST_IOUT_1 Upstream USB electrical signaling drive strength Boost Bit for Downstream Port ‘1’. ‘00’ = Normal electrical drive strength ‘01’ = Elevated electrical drive strength (+4% boost) ‘10’ = Elevated electrical drive strength (+8% boost) ‘11’ = Elevated electrical drive strength (+12% boost) Note: “Boost” could result in non-USB Compliant parameters (one example would be Test J/K levels), the OEM should use a ‘00’ value unless specific implementation issues require additional signal boosting to correct for degraded USB signalling levels. BIT NUMBER BIT NAME DESCRIPTION 7:0 PRTSP Port Swap: Swaps the Upstream and Downstream USB DP and DM Pins for ease of board routing to devices and connectors. ‘0’ = USB D+ functionality is associated with the DP pin and D- functionality is associated with the DM pin. ‘1’ = USB D+ functionality is associated with the DM pin and D- functionality is associated with the DP pin. |
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