User`s guide
AT2LP DDK board User’s Guide
2
Jumpers and Switches
The AT2LP DDK board has many switches and jumpers to help you evaluate the features of
the AT2LP:
Jumper/Switch Function
J1 CF connector. To use the CF connector the board must be reconfigured
as described below in the “recommended settings” section.
J2 40-pin IDE connector
J3 USB connector
J4 VBUSPWRD
1-2 = Bus-powered
2-3 (default) = Self-powered
J5, J6, J8, J10,
J14, J15
GPIO input signals.
1-2 (default) = GPIO0, GPIO1, and GPIO2 are driven high.
Removed = The GPIOs are pulled low and can be driven high
by the AT2LP or pushbuttons S2-S7
J7 Compact Flash power source. Note that this is an input to Q4 (???)
which switches the CF power on and off under AT2LP control.
VCC_3.3v (recommended) = Supply 3.3v to the CF socket
VCC_5V = CF power comes from external 5V supply
VBUS = CF power comes from VBUS
J8 See GPIO definition above.
J9 EEPROM enable. This jumper should not be removed. If the
EEPROM has been programmed incorrectly, unplug the IDE cable,
short pins 1-3 on the IDE connector and cycle power to return to
manufacturing mode.
J10 See GPIO above
J11 CompactFlash power control select
1-2 = Bus-powered. CF power is driven by PWR500# pin.
2-3 (default) = Self-powered. CF power is driven by the
DRV_PWR_VALID signal (CF CD2#)
J12 External power connector. Connect to standard 4-pin floppy connector.
12v is not required.
J13 Power select.
2-3 (default) = Self (External) power. Board is powered from
J12. J4 and J11 must also be changed to move from Self-
powered to bus-powered.
1-2 = Bus power. Board is powered from USB (J2).
J14, J15 See GPIO above
J16, J17 UDMA on CF socket. Default = OFF. Connect these two jumpers to
enable UDMA on the CF socket for micro drive class devices. If these
lines are connected to a CF that is not UDMA capable, the CF may
interfere with any other devices on the bus.