Part Number: TMS320F280049M
With the F2803x, we have from the datasheet Table 3-6 Boot Mode Selection on our current control board:
1. In normal operation:
- GPIO37 – Pullup resistor to Vcc
- GPIO34 – Not connected
- We are in Mode=3 (GetMode) which is by default ‘Boot to Flash’
2. In programming mode (JTAG-programming header is connected):
- GPIO37 – Pullup resistor to Vcc
- GPIO34 – Connect to GND. Note: this is achieved by routing GPIO34 to the programming header… The GND connection is present only when the prog header is connected.
- We are in Mode=2 (Wait) to allow our JTAG programmer to connect without tripping flash security which we enable.
So moving to F280049 (Table 6-9. Device Default Boot Modes), our plan for the new control board is:
1. In normal operation:
- GPIO24=1 – Not connected.
- GPIO32=1 – Pullup resistor to Vcc
Q: From Section 4.5, pullups are disabled by default, In this case, I will add a pullup resistor to Vcc just like GPIO32. In normal operation, we want to be in Boot_Mode=Flash, so pullups to Vcc on GPIO24 and GPIO32 should be ok right?
2. In programming mode:
- GPIO24=0 – Connect to GND.
Q: We plan to implement the same solution as we did for GPIO34 in F28033/64pin by routing GPIO24 to the prog header. Can you confirm that this should work to allow JTAG programmer to connect without tripping flash security?
- GPIO32=1 – Pullup resistor to Vcc
- Our intention is that we are in Mode=Wait. However, in Table 6-9, Wait and SCI are now in the same mode unlike in Piccolo where they are separate.
Q: How are SCI and WAIT modes differentiated then? I mean, how do we make sure that the DSP is in Wait mode and not enter SCI mode?
Regards, Bernd
