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Chapter 1
Fixed Behavior Signals
Configuring the USB0 Mode
You can configure the USB0 interface to be a USB Host port or a USB Device port, as shown
in Table 1-6. This mode is set when the system boots and does not change dynamically. The
reference carrier board uses the USB0 interface for a USB Device port.
Note
USB On-The-Go (OTG) is not supported.
USB0 Device Implementation on the Reference Carrier
Board
Figure 1-2 shows a schematic design for the USB0 Device implementation on the reference
carrier board.
Figure 1-2.
USB0 Device Reference Schematic
Table 1-6.
Configuring the USB0 Mode
Mode
How to Enable
USB Host
Connect the USB0_MODE signal to digital ground on your carrier
board. You can implement USB0 Host functionality in the same way that
the USB1 Host signal is implemented on the reference carrier board, as
described in the
USB1 Host Implementation on the Reference Carrier
section of this chapter.
USB Device
Connect the USB0_MODE signal to the VCC_3V3 rail on your carrier
board. Refer to the
USB0 Device Implementation on the Reference
Carrier Board
section of this chapter for more information about the
USB0 Device implementation on the reference carrier board.
U
S
B0_DP
U
S
B0_DN
U
S
B0_VBU
S
U
S
B0_MODE
3
4
L2
DLW 21
S
_900
1
2
3
GND
U17
TPD2EU
S
B
3
0
2
1
C
33
0.1 UF
10%
16 V
1
2
C
3
2
1.0 UF
10%
16 V
4
6
1
5
2
3
J8
CONN-U
S
B,B,HIGH_RETENTION
S
HLD1
S
HLD2
GND
D–
D+
VBU
S
2
2
2
+
3
.
3
V
2
2
1
R78
0 5%
1/16W
2
1 R76
0, 5%
1/16 W
R66
2
1
1 K
0.5%
0.1 UF 10%
50 V
1
2
C204
R61
S
p
a
re
R060
3
2
1
Pop
u
l
a
tion Option
s
For EMC/EMI
P
u
lled Up To
S
elect U
sb
Device Port
Not Pop
u
l
a
ted
The
s
e line
s
c
a
n
s
w
a
p
if l
a
yo
u
t i
s
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ier
D+
D–