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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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USB2640 датащи(PDF) 38 Page - Microchip Technology |
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USB2640 датащи(HTML) 38 Page - Microchip Technology |
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38 / 60 page  USB2640/USB2641 DS00001947C-page 38 2015-2021 Microchip Technology Inc. 7.3.5.18 EFh: Boost_Up 7.3.5.19 F0h: Boost_3:0 7.3.5.20 F1h: Port Swap Bit Name Description 7:2 Reserved Reserved 1:0 BOOST_IOUT USB electrical signaling drive strength Boost Bit for the Upstream Port ‘A’. ‘00’ = Normal electrical drive strength = No boost ‘01’ = Elevated electrical drive strength = Low (approximately 4% boost) ‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost) ‘11’ = Elevated electrical drive strength = High (approximately 12% boost) 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. Bit Name Description 7:6 Reserved Always reads ‘0’. 5:4 BOOST_IOUT_3 Upstream USB electrical signaling drive strength Boost Bit for Downstream Port ‘3’. ‘00’ = Normal electrical drive strength = No boost ‘01’ = Elevated electrical drive strength = Low (approximately 4% boost) ‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost) ‘11’ = Elevated electrical drive strength = High (approximately 12% boost) 3:2 BOOST_IOUT_2 Upstream USB electrical signaling drive strength Boost Bit for Downstream Port ‘2’. ‘00’ = Normal electrical drive strength = No boost ‘01’ = Elevated electrical drive strength = Low (approximately 4% boost) ‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost) ‘11’ = Elevated electrical drive strength = High (approximately 12% boost) 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. 1:0 Reserved Always reads ‘0’. Bit Byte Name Description 7:0 PRT_SWP 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= Reserved Bit 6= Reserved Bit 5= Reserved Bit 4= Reserved Bit 3= Controls physical port 3 Bit 2= Controls physical port 2 Bit 1= Reserved Bit 0= Controls physical port 0 |
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