AM335x EtherCAT system user application space without DDR memory

Hello,

I am considering to make EtherCAT system using AM3357.
In the case without using DDR memory, how much memory size can you use as user application area?

I am assuming that AM335x has internal memory as follows.
- L1P mem .. 32KB
- L1D mem .. 32KB
- SRAM .. 63KB
- OCMC SRAM .. 64KB
- L2 Cache .. 256KB
- PRUICSS .. 50KB as Total of
        IRAM0 .. 8KB
        IRAM1 .. 8KB
        Data RAM0 .. 8KB
        Data RAM1 .. 8KB
        Shared Data RAM2 .. 12KB

Best regards, RY