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TMS320DM6443
Digital Media System-on-Chip
SPRS282E–DECEMBER 2005–REVISED MARCH 2007
Table 2-17. USB Terminal Functions
SIGNAL
NAME
TYPE
(1)
OTHER
(2)(3)
DESCRIPTION
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
is the external oscillator clock input.
M24XI
F18
I
DV
DD18
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 should be left as a No Connect.
M24XO
F19
O
DV
DD18
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,
M24V
DD
should still be connected to the 1.8-V power supply.
M24V
DD
F16
S
(3)
When the USB peripheral
is not
used, M24V
DD
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,
M24V
SS
should still be connected to ground.
M24V
SS
F17
GND
(3)
When the USB peripheral
is not
used, M24V
SS
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
resistor.
USB operating mode identification pin. For Host mode operation, pull down this pin
to ground (V
SS
) via an external 1.5-k
resistor. For Device mode operation, pull up
this pin to DV
DD33
rail via an external 1.5-k
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
resistor.
USB bi-directional Data Differential signal pair [positive/negative].
USB_DP
G19
A I/O
When the USB peripheral
is not
used, the USB_DP signal should be pulled high
and the USB_DM signal should be pulled down via a 10-k
resistor.
Reference current output. This must be connected via a 10-k
±
1% resistor to
USB_V
SSREF
.
USB_DM
H19
A I/O
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
resistor to USB_V
SSREF
.
Ground for reference current. This must be connected via a 10-k
±
1% resistor to
USB_R1.
USB_V
SSREF
G16
GND
(3)
When the USB peripheral
is not
used, the USB_V
SSREF
signal should be connected
to V
SS
.
Analog 3.3 V power supply for USB phy.
USB_V
DDA3P3
J19
S
(3)
When the USB peripheral
is not
used, the USB_V
DDA3P3
signal should be
connected to DV
DD33
.
Analog ground for USB phy. When the USB peripheral
is not
used, the
USB_V
SSA3P3
signal should be connected to V
SS
.
1.8-V I/O power supply for USB phy.
USB_V
SSA3P3
J18
GND
(3)
USB_V
DD1P8
H17
S
(3)
When the USB peripheral
is not
used, the USB_V
DD1P8
signal should be connected
to DV
DD18
.
(1)
(2)
(3)
I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal
Specifies the operating I/O supply voltage for each signal
For more information, see the
Recommended Operating Conditions
table
Device Overview
40
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