F2837xS /2807x board setting

Both piccolo series TMS320F2807x and defino series TMS320F2837xS check below three pins at the reset to decide the booting mode.

MODE	GPIO72	GPIO84	/TRST	Boot mode
Mode EMU	X	X	1	Emulation Boot
Mode 0	0	0	0	Parallel I/O
Mode 1	0	1	0	SCI (RAM boot)
Mode 2	1	0	0	Wait Boot Mode
Mode 3	1	1	0	Get Mode (factory default = boot to flash)

easyDSP uses two kinds boot mode. SCI boot mode for RAM booting, GetMode boot mode for flash rom booting.
Below connection is recommended between easyDSP and MCU.
If external oscillator is used, 20Mhz is recommended.

- Factory default setting is assumed
- power pin (#4) of easyDSP 5x2 header should be connected to 3.3V
- connect SCIRXDA = GPIO85, SCITXDA = GPIO84
- In case there is a reset IC between easyDSP /RESET and MCU /XRS, it should transfer easyDSP /RESET signal to MCU /XRS within 0.5sec
- TX/RX pins are directly connected to MCU pins
- In case you insert buffer IC between easyDSP header and MCU, place buffer IC directly to easyDSP header so that all resistors can be connected to directly MCU
- /BOOT pin is connected to GPIO72 via 2kΩ series resistor
- /RESET pin is connected to reset generation circuit of MCU board
(Time duration of /RESET pin is around 500msec)
- In case you use pull-up resistor to each pin, the value of pull-up resistor should be higher than a few kilo ohm since there is 100Ω series resistor inside easyDSP pod

Please be careful when you use your own pull-up or pull-down resistor on the easyDSP signal pins. Please use appropriate filter circuit to your reset generation circuit to prevent unintentional reset generation.