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When SHORT, the +5V from the voltage regulator is connected to board VCC. This
jumper must be removed when using an external +5V power supply to avoid current
flowing back to the regulator.
When SHORT, the VCC is connected to CPU’s VCC pins. Before removing this jumper,
remove the J3 (AVCC to CPU) jumper as well to completely disconnect the power from
the CPU.
When SHORT, board’s VCC is connected to CPU’s AVcc pin.
When SHORT, board’s GND is connected to CPU’s AGND pin.
When SHORT, board’s VCC is connected to CPU’s AVR+ pin. When removed, the
voltage at the AVR+ pin is set to 4V
When SHORT, board’s GND is connected to CPU’s AVR- pin. When removed, the
voltage at the AVR- pin is set to 0.9V.
These jumpers select, which of the two UART0, UART1 interfaces signals will be
connected to the pins of the K7 connector. If all of these jumpers are in
1-2 position - the UART1 interface signals will be connected to the K7
2-3 position – the UART0 interface signals will be connected to the K7 connector.
Default setting: the UART1 signals are connected to the K7.
Note: The J7 jumper selects between SCK1 and SCK0, J8 between SIN1 and SIN0
and J9 between SOT1 and SOT0
Warning: if you want to use the K7 connector when Mainboard is
connected to the CPU board, you have to disconnect the selected serial
interface (UART0 or UART1) from the RS232 drivers on the Mainboard. To
achieve this, remove jumpers on positions 3-4, 5-6 from both the J21 and J22
headers on the Mainboard. Also, when the Mainboard is connected to the
CPU board and the Async. Serial programming mode is set on the Mainboard
System control DIP switches, the FPGA UART is connected to UART0 or
UART1 (depending on the setting of the UART0/1 switch) after reset. If you
want to use K7 also in that case, remove the 3-4, 5-6 jumpers on the J23.