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TMS320C5515
www.ti.com
SPRS645F – AUGUST 2010 – REVISED OCTOBER 2013
2.5.9
USB 2.0 Terminal Functions
Table 2-13. USB2.0 Terminal Functions
SIGNAL
NAME
NO.
TYPE (1)
(2)
OTHER (3)
(4)
DESCRIPTION
USB 2.0
12-MHz crystal oscillator input.
When the USB peripheral is not used, USB_MXI should be connected to ground
(V SS ).
USB_MXI
G13
I
USB_V DDOSC
When using an external 12-MHz oscillator, the external oscillator clock signal should
be connected to the USB_MXI pin and the amplitude of the oscillator clock signal
must meet the V IH requirement (see Section 4.2 , Recommended Operating
Conditions ). The USB_MXO is left unconnected and the USB_V SSOSC signal is
connected to board ground (V SS ).
12-MHz crystal oscillator output.
When the USB peripheral is not used, USB_MXO should be left unconnected.
USB_MXO
G14
O/Z
USB_V DDOSC
When using an external 12-MHz oscillator, the external oscillator clock signal should
be connected to the USB_MXI pin and the amplitude of the oscillator clock signal
must meet the V IH requirement (see Section 4.2 , Recommended Operating
Conditions ). The USB_MXO is left unconnected and the USB_V SSOSC signal is
connected to board ground (V SS ).
see
3.3-V power supply for USB oscillator.
USB_V DDOSC
G12
S
Section 4.2 ,
ROC
When the USB peripheral is not used, USB_V DDOSC should be connected to ground
(V SS ).
Ground for USB oscillator. When using a 12-MHz crystal, this pin is a local ground
for the crystal and must not be connected to the board ground (See Figure 5-7 ).
USB_V SSOSC
F11
S
see
Section 4.2 ,
ROC
When using an external 12-MHz oscillator, the external oscillator clock signal should
be connected to the USB_MXI pin and the amplitude of the oscillator clock signal
must meet the V IH requirement (see Section 4.2 , Recommended Operating
Conditions ). The USB_MXO is left unconnected and the USB_V SSOSC signal is
connected to board ground (V SS ).
USB power detect. 5-V input that signifies that VBUS is connected.
USB_VBUS
J12
A I/O
see
Section 4.2 ,
ROC
This signal must be powered on in the order listed in Section 5.3.1 , Power-Supply
Sequencing .
When the USB peripheral is not used, the USB_VBUS signal should be connected
to ground (V SS ).
USB_DP
USB_DM
H14
J14
A I/O
A I/O
USB_V DDA3P3
USB_V DDA3P3
USB bi-directional Data Differential signal pair [positive/negative].
When the USB peripheral is not used, the USB_DP and USB_DM signals should
both be tied to ground (V SS ).
External resistor connect. Reference current output. This must be connected via a
10-k ? ±1% resistor to USB_V SSREF and be placed as close to the device as
USB_R1
G9
A I/O
USB_V DDA3P3
possible.
When the USB peripheral is not used, the USB_R1 signal should be connected via
a 10-k ? resistor to USB_V SSREF .
Ground for reference current. This must be connected via a 10-k ? ±1% resistor to
see
USB_R1.
USB_V SSREF
G10
GND
Section 4.2 ,
ROC
When the USB peripheral is not used, the USB_V SSREF signal should be connected
directly to ground (V ss ).
(1)
(2)
(3)
(4)
I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal, BH = Bus Holder
Input pins of type I, I/O, and I/O/Z are required to be driven at all times. To achieve the lowest power, these pins must not be allowed to
float. When they are configured as input or high-impedance state, and not driven to a known state, they may cause an excessive IO-
supply current. Prevent this current by externally terminating it or enabling IPD/IPU, if applicable.
IPD = Internal pulldown, IPU = Internal pullup. For more detailed information on pullup/pulldown resistors and situations where external
pullup/pulldown resistors are required, see Section 3.8.1 , Pullup/Pulldown Resistors .
Specifies the operating I/O supply voltage for each signal
Copyright ? 2010–2013, Texas Instruments Incorporated
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