The recommended power-up sequence is to apply power to the core voltage (VDD) first, followed by the I/O voltage (VDDIO), and then the clock signal. This ensures that the internal voltage regulators are properly initialized.
The EMIF can be configured for DDR2 memory by setting the EMIF control registers to select the DDR2 mode, and configuring the memory timings according to the DDR2 specification. Refer to the TRM (Technical Reference Manual) for detailed information.
The maximum frequency of the ARM core is 720 MHz, but this can be limited by the specific application and the thermal design of the system.
The VPSS can be used for video encoding and decoding by configuring the VPSS registers to select the desired video standard, and using the VPSS APIs to control the video processing. Refer to the VPSS documentation and the DM6446 software development kit (SDK) for more information.
The DM6446 can address up to 2 GB of external memory, but the actual amount of memory that can be connected depends on the specific application and the memory technology used.