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数据搜索系统，热门电子元器件搜索 |
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USB2513 数据表(PDF) 47 Page - SMSC Corporation |
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USB2513 数据表(HTML) 47 Page - SMSC Corporation |
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47 / 72 page  USB 2.0 Hi-Speed Hub Controller Datasheet SMSC USB251x 47 Revision 1.0 (3-11-09) DATASHEET 8.2.1.29 Register F8h: Boost_4:0 Note: “Boost” could result in non-USB Compliant parameters, OEM should use a ‘00’ value unless specific implementation issues require additional signal boosting to correct for degraded USB signalling levels. 8.2.1.30 Register FAh: Port Swap BIT NUMBER BIT NAME DESCRIPTION 7:6 BOOST_IOUT_4 USB electrical signaling drive strength Boost Bit for Downstream Port ‘4’. ‘00’ = Normal electrical drive strength = No boost ‘01’ = Elevated electrical drive strength = Low (~4% boost) ‘10’ = Elevated electrical drive strength = Medium (~ 8% boost) ‘11’ = Elevated electrical drive strength = High (~12% boost) 5:4 BOOST_IOUT_3 USB electrical signaling drive strength Boost Bit for Downstream Port ‘3’. ‘00’ = Normal electrical drive strength = No boost ‘01’ = Elevated electrical drive strength = Low (~4% boost) ‘10’ = Elevated electrical drive strength = Medium (~ 8% boost) ‘11’ = Elevated electrical drive strength = High (~12% boost) 3:2 BOOST_IOUT_2 USB electrical signaling drive strength Boost Bit for Downstream Port ‘2’. ‘00’ = Normal electrical drive strength = No boost ‘01’ = Elevated electrical drive strength = Low (~4% boost) ‘10’ = Elevated electrical drive strength = Medium (~ 8% boost) ‘11’ = Elevated electrical drive strength = High (~12% boost) 1:0 BOOST_IOUT_1 USB electrical signaling drive strength Boost Bit for Downstream Port ‘1’. ‘00’ = Normal electrical drive strength = No boost ‘01’ = Elevated electrical drive strength = Low (~4% boost) ‘10’ = Elevated electrical drive strength = Medium (~ 8% boost) ‘11’ = Elevated electrical drive strength = High (~12% boost) 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. Bit 7= Controls Port 7 Bit 6= Controls Port 6 Bit 5= Controls Port 5 Bit 4= Controls Port 4 Bit 3= Controls Port 3 Bit 2= Controls Port 2 Bit 1= Controls Port 1 Bit 0= When this bit is ‘1’, the upstream port DP/DM is swapped. |
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