Preliminary - Information Subject to Change - 9/24/98
5 - 6
EZ-USB Development Board
Jumpers
(1). If a shorting plug is installed on J5 pins 2-3, pressing the EZ-
USB Development Board RESET push-button resets the AN2131Q
and simulates a USB bus disconnect. Releasing the RESET button
re-connects the AN2131Q to the USB. If the disconnect feature is
not required place the shorting plug on J5 pins 1-2.
The advantage of keeping J5 jumpered to pins 2-3 is that if your
firmware crashes, you can press the RESET button to re-connect as
a “clean” USB device and automatically re-load the Keil debug
monitor (turning on the green light).
Table 5-1: UART Buffer Connections
JP1 Pins
Function
Default
1-2
TXD0
Installed
3-4
RXD0
Installed
5-6
TXD1
Installed
7-8
RXD1
Installed
Table 5-2: Board Power Source
J4 Pins
Function
Default
1-2
External power
(supplied on J2)
2-3
USB Connector
Installed
Table 5-3: USB Disconnect on Push-button RESET
J5 Pins
Function
Default
1-2
No
Installed
2-3
Yes (1)
Installed
