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TUSB4041IPAPR 数据表(PDF) 23 Page - Texas Instruments |
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TUSB4041IPAPR 数据表(HTML) 23 Page - Texas Instruments |
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23 / 48 page  23 TUSB4041I www.ti.com SLLSEK3E – JULY 2015 – REVISED SEPTEMBER 2017 Product Folder Links: TUSB4041I Submit Documentation Feedback Copyright © 2015–2017, Texas Instruments Incorporated 8.5.12 USB 2.0 Port Polarity Control Register Offset = Bh Figure 13. USB 2.0 Port Polarity Control Register 7 6 5 4 3 2 1 0 customPolarity RSVD p4_usb2pol p3_usb2pol p2_usb2pol p1_usb2pol p0_usb2pol RW-0 R-0 R/RW-0 R/RW-0 R/RW-0 R/RW-0 R/RW-0 Table 14. USB 2.0 Port Polarity Control Register Field Descriptions Bit Field Type Reset Description 7 customPolarity RW 0 Custom USB 2.0 polarity This bit controls the ability to write the p[4:0]_usb2pol bits. 0 = The p[4:0]_usb2pol bits are read only, and the values are loaded from the OTP ROM. 1 = The p[4:0]_usb2pol bits are R/W and can be loaded by EEPROM or written by SMBus from this register. This bit may be written simultaneously with the p[4:0]_usb2pol bits 6:5 RSVD R 0 Reserved Read only, returns 0 when read 4 p4_usb2pol R/RW 0 Downstream port 4 DM/DP polarity This bit controls the polarity of the port. 0 = USB 2.0 port polarity is as shown in the pinout. 1 = USB 2.0 port polarity is swapped from that shown in the pinout (that is, DM becomes DP, and DP becomes DM). This bit is read only unless the customPolarity bit is set to 1. If customPolarity is 0, the value of this bit reflects the value of the OTP ROM p4_usb2pol bit. 3 p3_usb2pol R/RW 0 Downstream port 3 DM/DP polarity This bit controls the polarity of the port. 0 = USB 2.0 port polarity is as shown in the pinout. 1 = USB 2.0 port polarity is swapped from that shown in the pinout (that is, DM becomes DP, and DP becomes DM). This bit is read only unless the customPolarity bit is set to 1. If customPolarity is 0, the value of this bit reflects the value of the OTP ROM p3_usb2pol bit. 2 p2_usb2pol R/RW 0 Downstream port 2 DM/DP polarity This bit controls the polarity of the port. 0 = USB 2.0 port polarity is as shown in the pinout. 1 = USB 2.0 port polarity is swapped from that shown in the pinout (that is, DM becomes DP, and DP becomes DM). This bit is read only unless the customPolarity bit is set to 1. If customPolarity is 0, the value of this bit reflects the value of the OTP ROM p2_usb2pol bit. 1 p1_usb2pol RRW 0 Downstream port 1 DM/DP polarity This bit controls the polarity of the port. 0 = USB 2.0 port polarity is as shown in the pinout. 1 = USB 2.0 port polarity is swapped from that shown in the pinout (that is, DM becomes DP, and DP becomes DM). This bit is read only unless the customPolarity bit is set to 1. If customPolarity is 0, the value of this bit reflects the value of the OTP ROM p1_usb2pol bit. |
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