Hardware Description
AT18F-DK3 Configurator Development Kit User Guide
2-5
3685A–CNFG–04/08
2.1.5
2 MHz Oscillator and Clock Selection Jumper
The 2 MHz Oscillator and Clock Selection Jumper, JP-GCLK, are shown on the ATF15xx-DK3 Base
Board of the AT18F-DK3 Kit. However, these components are designed for other adapter boards to be
used with Atmel ATF15xx Series CPLDs, and they are not intended to use with ATF15xxDK3-SAX20
socket adapter for AT18F Series Configurators. Therefore, there is no detailed description about these
components in this document, but user can always reference ATF15xx-DK3 user guide for more
information.
Figure 2-6.
Circuit Diagram of Oscillator and Clock Selection Jumper
2.1.6
VCCIO and VCCINT Voltage Selection Jumpers and LEDs
The VCCIO and VCCINT Voltage Selection Jumpers, labeled VCCIO Selector and VCCINT Selector,
respectively on ATF15xx-DK3 Base Board of the AT18F-DK3 kit are used to select voltage supply to the
device and to the JTAG connector. VCCIO voltage is used to set the I/O interface voltage (VCCO) and
JTAG programming voltage (VCCJ) of the AT18F Series Configurator. Also, VCCINT voltage jumper is
used to set the Core supply voltage of the AT18F Series device. When programming the AT18F Series
Configurator with the ATF15xxDK3-SAX20 adapter board, it is required to set both the VCCIO voltage
selector jumper and VCCINT voltage selection jumper to 3.3V.
Note:
The power of the ATF15xx-DK3 Base Board MUST BE turned OFF when changing the
position of the VCCIO or VCCINT voltage selection jumper (VCCIO Selector or VCCINT
Selector).
