Memory fitter error.

Hello,

I'm using an Arria V SOC device with more than 17Mbits of on-chip RAM.

My design requires using a Dual Port RAM of the following dimensions:

Width - 64 bits.

Depth - 32,000 (64 bit words).

This gives a total memory content of ~2Mbits (well within the 17Mbits budget).

Yet when I compile the design, I get the following fitter error:

Error (170039): Cannot place 256 RAM cells or portions of RAM cells in the design

As far as I understand

Why can't the tool partition the memory across its RAM resources ?

Note: I'm using Quartus 14.1