SV51002
2014.01.10
ALM Operating Modes
1-7
The LUT, adder, or register output can drive the ALM outputs. The LUT or adder can drive one output
while the register drives another output.
Register packing improves device utilization by allowing unrelated register and combinational logic to be
packed into a single ALM. Another mechanism to improve fitting is to allow the register output to feed back
into the look-up table (LUT) of the same ALM so that the register is packed with its own fan-out LUT. The
ALM can also drive out registered and unregistered versions of the LUT or adder output.
Figure 1-7: ALM Connection Details for Stratix V Devices
syncload
aclr[1:0]
dataf0
datae0
shared_arith_in
carry_in
clk[2:0] sclr
dataa
datab
datac0
4-Input
LUT
GND
3-Input
LUT
+
D
CLR
Q
Row, Column
Direct Link Routing
3
3-Input
LUT
D
CLR
Q
Row, Column
Direct Link Routing
datac1
4-Input
LUT
3
3-Input
+
D
CLR
Q
Row, Column
Direct Link Routing
LUT
3-Input
LUT
VCC
D
CLR
Q
Row, Column
Direct Link Routing
datae1
dataf1
shared_arith_out
carry_out
ALM Operating Modes
The Stratix V ALM operates in any of the following modes:
? Normal mode
? Extended LUT mode
? Arithmetic mode
Logic Array Blocks and Adaptive Logic Modules in Stratix V Devices
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Altera Corporation
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