LFEC3E-3QN208I Lattice, LFEC3E-3QN208I Datasheet - Page 391
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LFEC3E-3QN208I
Manufacturer Part Number
LFEC3E-3QN208I
Description
IC FPGA 3KLUTS 208PQFP
Manufacturer
Lattice
Series
EC3r
Datasheets
1.LFEC3E-5TN144C.pdf
(163 pages)
2.LFE3-35EA-8FN672I.pdf
(21 pages)
3.LFEC3E-3QN208I.pdf
(478 pages)
Specifications of LFEC3E-3QN208I
Number Of Logic Elements/cells
3100
Number Of Labs/clbs
-
Total Ram Bits
56320
Number Of I /o
145
Number Of Gates
-
Voltage - Supply
1.14 V ~ 1.26 V
Mounting Type
Surface Mount
Operating Temperature
-40°C ~ 100°C
Package / Case
208-BFQFP
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
Q6377645
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LFEC3E-3QN208I
Manufacturer:
Lattice Semiconductor Corporation
Quantity:
10 000
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Lattice Semiconductor
Implementing Multiplexers
The flexible configurations of LUTs can realize any 4-, 5-, or 6-input logic function like 2-to-1, 3-to-1 or 4-to-1 multi-
plexers. Larger multiplexers can be efficiently created by programming multiple 4-input LUTs. Synthesis tools camn
automatically infer Lattice FPGA optimized multiplexer library elements based on the behavioral description in the
HDL source code. This provides the flexibility to the Mapper and Place and Route tools to configure the LUT mode
and connections in the most optimum fashion.
Clock Dividers
There are two ways to implement clock dividers in Lattice Semiconductor FPGA devices. The first is to cascade the
registers with asynchronous clocks. The register output feeds the clock pin of the next register (Figure 13-7). Since
the clock number in each PFU is limited to two, any clock divider with more than two bits will require multiple PFU
implementations. As a result, the asynchronous daisy chaining implementation of clock divider will be slower due to
the inter-PFU routing delays. This kind of delays is usually ambiguous and inconsistent because of the nature of
FPGA routing structures.
Figure 13-7. Daisy Chaining of Flip-flops
16:1 MUX
…
process(sel, din)
…
LU
D
begin
end process;
if
elsif (sel="0001") then muxout <= din(1);
elsif (sel="0010") then muxout <= din(2);
elsif (sel="0011") then muxout <= din(3);
elsif (sel="0100") then muxout <= din(4);
elsif (sel="0101") then muxout <= din(5);
elsif (sel="0110") then muxout <= din(6);
elsif (sel="0111") then muxout <= din(7);
elsif (sel="1000") then muxout <= din(8);
elsif (sel="1001") then muxout <= din(9);
elsif (sel="1010") then muxout <= din(10);
elsif (sel="1011") then muxout <= din(11);
elsif (sel="1100") then muxout <= din(12);
elsif (sel="1101") then muxout <= din(13);
elsif (sel="1110") then muxout <= din(14);
elsif (sel="1111") then muxout <= din(15);
else muxout <= '0';
end if;
PFU
(sel="0000") then muxout <= din(0);
13-10
LU
D
PFU
HDL Synthesis Coding Guidelines
for Lattice Semiconductor FPGAs
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