The new TMS320F28377S cannot connect to the emulator, what should I do?

fish001

The new TMS320F28377S cannot connect to the emulator, what should I do? [Copy link]

Phenomenon: (1) All BOOTGPIO are pulled high and the emulator cannot be connected; (2) There is a periodic RST signal; (3) After removing the pin pull-up resistor, the Boot mode is set to the first ParallelIO mode and the programming can be successful.

On page 193 of the TMS320F28377S data sheet, there is a NOTE, which means that when programming a brand new chip, if the boot mode is set to the 4th GetMode, the watchdog is enabled by default, so there is always an RST signal on the RST pin, which will affect the normal JTAG connection and device initialization. So they recommend using the third wait mode, or other modes, for a brand new unprogrammed chip, and then connecting the emulator.

If it has been programmed, it will generally not have any impact, because the watchdog is usually disabled and will not affect JTAG operation. Unlike previous products, the F28377S pins have internal weak pull-ups, which are disabled during the boot phase, so external pull-ups must be added.