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Chapter 3
USB Interfaces (J15A/B, J21A/B)
The ReadyBoard 700 contains one root USB hub with four functional USB ports. The PC-style (or
Standard) connector (J5A/B) provides two of the four USB ports (USB0 and USB1). The other two
USB ports share a single 10 pin header (J21A/B) on the board.
Features implemented in the USB ports include the following:
One root hub and two USB ports on connector (J15A/B)
One root hub and two USB ports on connector (J21A/B)
USB v.1.1 and Universal OHCI v.1.1 compatible
Integrated physical layer transceivers
Over-current fuses, located on the board, are used on all four USB ports
USB0 and USB1 have independent fuses and USB2 and USB3 share a single fuse on the board.
See Table 2-4.
Primary USB0 and USB1 (J15A/B)
Table 3-15. USB 1 & 2 Interface Pin/Signal Descriptions (J15/B)
Pin #
Signal
1
+5V
2
USBP0-
3
USBP0+
4
GND
5
+5V
6
USBP1-
7
USBP1+
8
GND
Notes: The shaded area denotes power or ground.
Secondary USB2 and USB3 (J21A/B)
Table 3-16. USB 2 & 3 Interface Pin/Signal Descriptions (J21A/B)
Pin #
Signal
1, 2
+5V
3
USBP2-
4
USBP3-
5
USBP2+
6
USBP3+
7, 8,
GND
9, 10
Notes: The shaded area denotes power or ground.
ReadyBoard 700
Description
+5V through a fuse (F1)
Universal Serial Bus Port 0 Data Negative
Universal Serial Bus Port 0 Data Positive
Goes to ground thorough a choke
+5V ±5% through a fuse (F3)
Universal Serial Bus Port 1 Data Negative
Universal Serial Bus Port 1 Data Positive
Goes to ground thorough a choke
Description
+5V ±5% through a fuse (F4)
Universal Serial Bus Port 2 Data Negative
Universal Serial Bus Port 3 Data Negative
Universal Serial Bus Port 2 Data Positive
Universal Serial Bus Port 3 Data Positive
Goes to ground thorough a choke
Reference Manual
Hardware
43
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