no free buffers for rx

i am able to receive 460 UDP packets of size 512 out of 512 UDP packet, i have add on-chip memory using sopc builder and then connect it to cpu and tse_mac (please see the attached configuration) and made small changes related to packet memory in ipport.h.

if i add more packet to transmit from server side it start saying again "no free buffer for rx"

but i am still running out of 512-460 = 52 UDP packet to get it done .

i just wanted to know what is the data flow in this case after adding packet memory, is it something like

tse_mac--->packet memory----->TCP/IP_inich----->CPU------>Application

or something else so that i can add sufficient memory on desire place

with regards

kaushal