write to segment (multiple locations) of memory

OK. I've played a bit with the Megafunction tool and it seems that the memory interfaces it provides are not exactly what I need.

Here is a rephrased problem statements:

Imagine you have a 128x8bit memory initialized to zero.

I want to be able to write "tail"-sections of this memory with

the same value in one clock-cycle.

Note that I always write from an index i till the end. (I call it a "tail"-section)

Example:

Write from location 64 to 127 the value 7.

Result: half memory is zero half is 7.

Write from location 96 to 127 the value 8.

Result: half memory is zero, one quarter 7, other quarter 8.

This kind of writes are trivial to implement if each memory word (location) provides a write_enable control signal, so that I could enable and disable it accordingly.

The question is how do I do in on a Stratix IV chip (EP4SGX230)?

I see that I have the following embedded memories:

• MLAB (640bit)

• M9K (9kbit)

• M144K (144kbit)

Do any of these extend the write_enable control signals for each word?

If not what is the most compact way to implement the memory I have described?