TNETV6446AINZWT datasheet(40/227 Pages) TI1

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TMS320DM6446

SPRS283H – DECEMBER 2005 – REVISED SEPTEMBER 2010

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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

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

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

(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

(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

(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.

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