I am having a large text file which contains only the pixel values of an
image.....here i can able to read the pixels using $readmemh system
task..... but the prolem is memory......am using only 1000 words of
memory as below
reg [31:0] Mem [0:999];
initial $readmemh("pixels.txt",Mem);
By this i can get only 1000 pixles from the text file and i will give
these pixels to the next module for furthur processing....then i have to
read the next 1000 pixels from the text file and put it in the
Mem....similarly i want all the pixels to be readed from the txt file
with the Mem size as 1000 and give those to the next module for furthur
processing......so how i can do this plz i will be very thank full to
u...plz help me.....

The Verilog system tasks $readmemb/h are prepared to fill only a part of
the memory but not to read only a part of the file. This is different
from C. So, I would suggest that you increase the size of the memory so
that the complete file is read with one single call of $readmemh.
Afterwards you may process the data in chunks of 1000 samples out of the
memory.

Is there any method where we can read chunks of datas from a file using
verilog....

No.

It's quite simple to read the complete file. Why don't you do this?

i have tried but in icarus simulator the its reading upto 1980
words....after that it is giving error as below
Error: Invalid input character

That's surprising! Are you sure that there is no invalid character in
the file. If you delete the first n items does the error number stay the
same?

thanks a lot for ur reply......s u r right sir....i found one invalid
charachter over there now it is reading properly...