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USB2514Bi-AEZG 数据表(PDF) 29 Page - Microchip Technology |
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USB2514Bi-AEZG 数据表(HTML) 29 Page - Microchip Technology |
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29 / 57 page  2010 - 2015 Microchip Technology Inc. DS00001692C-page 29 USB251xB/xBi 5.1.28 REGISTER F8H: BOOST_4:0 5.1.29 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) Note: Boost could result in non-USB compliant parameters. Therefore, a value of 00 should be implemented unless specific implementation issues require additional signal boosting to correct for degraded USB sig- naling levels. Bit Number Bit Name Description 7:0 PRTSP Port Swap: swaps the upstream USBDP/USBDM pins (USBDP_UP and USBDM_UP) and the downstream USBDP/USBDM pins (USBDP_DN[x:1] and USBDP_DN[x:1]) 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 : rsvd Bit 6 : rsvd Bit 5 : rsvd Bit 4 : controls port 4 Bit 3 : controls port 3 Bit 2 : controls port 2 Bit 1 : controls port 1 Bit 0 : when set to 1, the upstream port DP/DM is swapped. |
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