j-breeze,
The Cache Tag RAM viewer is not equally supported in all targets (check here). If you don't see the coloring scheme in the Memory view of your CCSv3.3, then it is probably not supported.
I see the coloring scheme in CCSv5.5 (I don't have v3.3 installed anymore), therefore I am positive this is not a hardware limitation - I am using my DM6437 connected both with the embedded XDS510 and with an external XDS560v2 (the emulator can also influence that).
Please let me know if that is what you were looking for.
Regards,
Rafael