C2834x board setting


TMS320C2834x checks below four pins at the reset to decide the booting mode.

MODE GPIO87
XA15   
GPIO86
XA14
GPIO85
XA13
GPIO84
XA12

 Booting mode

E 1 1 1 0  SCI-A boot  (for RAM booting)
D 1 1 0 1  SPI-A boot  (for flashrom booting)

easyDSP activates both /BOOT and /RESET pins low for RAM booting. And it activates only /RESET pin low for the menu 'DSP>Reset DSP'. So please connect easyDSP as below so that easyDSP can select appropriate RAM booting mode (SCI-A).
Blue box of above table is the recommendation for flashrom booting. Hardware preparation is your task.


( SCI-A boot @ RAM booting. SPI-A boot @ flashrom booting )

And please note belows.
- SPI-A is used for easyDSP. You can't use SPI-A for your purpose.
- power pin (#4) of easyDSP 5x2 header should be connected to 3.3V
- TX/RX pins are directly connected to MCU pins
- 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
- 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 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.

Caution !!
When you select menu 'MCU'>'Reset MCU', only /RESET pin is activated low. /BOOT is still high at that time.
Therefore don't use this menu if you are not ready to use SPI-A boot mode.