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TNETV6446AINZWT 数据表(PDF) 40 Page - Texas Instruments |
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TNETV6446AINZWT 数据表(HTML) 40 Page - Texas Instruments |
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40 / 227 page  TMS320DM6446 SPRS283H – DECEMBER 2005 – REVISED SEPTEMBER 2010 www.ti.com Table 2-17. USB Terminal Functions SIGNAL TYPE(1) OTHER(2) (3) DESCRIPTION NAME NO. USB 2.0 Crystal input for M24 oscillator (24 MHz for USB). If a crystal input is not used, but instead a physical clock-in source is supplied, this M24XI F18 I DVDD18 is the external oscillator clock input. When the USB peripheral is not used, M24XI should be left as a No Connect. Crystal output for M24 oscillator. If a crystal input is not used, but instead a physical clock-in source is supplied, M24XO F19 O DVDD18 M24XO should be left as a No Connect. When the USB peripheral is not used, M24XO should be left as a No Connect. 1.8-V power supply for M24 oscillator. If a crystal input is not used, but instead a physical clock-in source is supplied, M24VDD F16 S (3) M24VDD should still be connected to the 1.8-V power supply. When the USB peripheral is not used, M24VDD should be connected to the 1.8-V power supply. Ground for M24 oscillator. If a crystal input is not used, but instead a physical clock-in source is supplied, M24VSS F17 GND (3) M24VSS should still be connected to ground. When the USB peripheral is not used, M24VSS should be connected to ground. 5-V input that signifies that VBUS is connected. USB_VBUS J17 A I/O (3) When the USB peripheral is not used, the USB_VBUS signal should be either pulled down or pulled up via a 10-k Ω resistor. USB operating mode identification pin. For Host mode operation, pull down this pin to ground (VSS) via an external 1.5-kΩ resistor. For Device mode operation, pull up this pin to DVDD33 rail via an external 1.5-kΩ resistor. USB_ID J16 A I/O When the USB peripheral is not used, the USB_ID signal should be either pulled down or pulled up via a 10-k Ω resistor. USB_DP G19 A I/O USB bi-directional Data Differential signal pair [positive/negative]. When the USB peripheral is not used, the USB_DP signal should be pulled high USB_DM H19 A I/O and the USB_DM signal should be pulled down via a 10-k Ω resistor. Reference current output. This must be connected via a 10-k Ω ±1% resistor to USB_VSSREF. USB_R1 H18 A I/O (3) When the USB peripheral is not used, the USB_R1 signal should be connected via a 10-k Ω resistor to USB_VSSREF. Ground for reference current. This must be connected via a 10-k Ω ±1% resistor to USB_R1. USB_VSSREF G16 GND (3) When the USB peripheral is not used, the USB_VSSREF signal should be connected to VSS. Analog 3.3 V power supply for USB phy. USB_VDDA3P3 J19 S (3) When the USB peripheral is not used, the USB_VDDA3P3 signal should be connected to DVDD33. Analog ground for USB phy. When the USB peripheral is not used, the USB_VSSA3P3 J18 GND (3) USB_VSSA3P3 signal should be connected to VSS. 1.8-V I/O power supply for USB phy. USB_VDD1P8 H17 S (3) When the USB peripheral is not used, the USB_VDD1P8 signal should be connected to DVDD18. I/O Ground for USB phy. USB_VSS1P8 H16 GND (3) When the USB peripheral is not used, the USB_VSS1P8 signal should be connected to VSS. (1) I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal (2) Specifies the operating I/O supply voltage for each signal (3) For more information, see Section 5.2, Recommended Operating Conditions. 40 Device Overview Copyright © 2005–2010, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TMS320DM6446 |
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