Honored ContributorIn the Max V family handbook, it says that there are 10LEs per LAB, and that for all devices up to the 5M240, there are 24 LABs organised as 6x4. For the devices with less than 240 LEs, does this mean that those LEs can be distributed amongst the 24 LABs in whatever configuration I want? because that would make the 5M40Z (under a dollar!) really really handy.
-A
Honored ContributorNo, I'm afraid you'll only be able to use 4 LABs with the 5M40Z.
Compiled with default settings, the code below requires 36 LEs distributed over 6 LABs; it fails to fit when targetting a 5M40Z.module lab_test (
input wire clk_i,
input wire enable1_i,
input wire enable2_i,
input wire data_i,
output reg data_o
);
reg sr1;
reg sr2;
genvar i;
generate for(i = 0; i < 4; i = i+1) begin : SRS
always @ (posedge clk_i) begin
if (enable1_i)
sr1 <= { sr1, data_i };
if (enable2_i)
sr2 <= { sr2, sr1 };
data_o <= sr2;
end
end
endgenerate
endmoduleDoes this above mean that it's mistyped in the handbook/datasheet?
I was totally mislead regarding 5M40Z, as the table really states it has 24 LABs in 6*4 arrangement, and even QuartusII Chip Planner shows 24LABs which confuses me even more. Btw. fitter report clearly states there are maximum 40 LEs which means for me 1 column and 4 rows. Is that the real arrangement of the 5M40Z? I already started my design on 5M40Z so it's important for me to know what it is really capable of. Thanks in advance for anyone who can clarify this...Honored ContributorWow. I wrote that so long ago I don't even remember this right.
But the handbook shows the same 24 LAB (240 LE) to all devices up to the 5M240Z, which leads me to suspect yes, there's something wrong with that table.. In any case, I suggest you try to compile the code above with a recent version of Quartus, to see if the situation has improved.Honored ContributorIf you look in the Quartus new project wizard, you will find it says:
5M40Z### - 40LE's 5M80Z### - 80LE's 5M160Z### - 160LE's 5M240Z### - 240LE's You will notice that the number after the 5M (series) is the number of logic elements.
