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1-8
Normal Mode
SV51002
2014.01.10
? Shared arithmetic mode
Normal Mode
Normal mode allows two functions to be implemented in one Stratix V ALM, or a single function of up to
six inputs.
Up to eight data inputs from the LAB local interconnect are inputs to the combinational logic.
The ALM can support certain combinations of completely independent functions and various combinations
of functions that have common inputs.
Figure 1-8: ALM in Normal Mode
Combinations of functions with fewer inputs than those shown are also supported. For example, combinations
of functions with the following number of inputs are supported: 4 and 3, 3 and 3, 3 and 2, and 5 and 2.
dataf0
dataf0
datae0
datac
dataa
4-Input
LUT
combout0
datae0
datac
dataa
datab
5-Input
LUT
combout0
datab
datad
datae1
dataf1
4-Input
LUT
combout1
datad
datae1
5-Input
LUT
combout1
dataf1
dataf0
datae0
datac
dataa
datab
5-Input
LUT
combout0
dataf0
datae0
dataa
datab
6-Input
LUT
combout0
datac
datad
datae1
dataf1
3-Input
LUT
combout1
datad
dataf0
datae0
dataf0
datae0
datac
dataa
5-Input
LUT
combout0
dataa
datab
datac
datad
6-Input
LUT
combout0
datab
datad
datae1
dataf1
4-Input
LUT
combout1
datae1
dataf1
6-Input
LUT
combout1
For the packing of 2 five-input functions into one ALM, the functions must have at least two common inputs.
The common inputs are dataa and datab . The combination of a four-input function with a five-input
function requires one common input (either dataa or datab ).
In the case of implementing 2 six-input functions in one ALM, four inputs must be shared and the
combinational function must be the same. In a sparsely used device, functions that could be placed in one
Altera Corporation
Logic Array Blocks and Adaptive Logic Modules in Stratix V Devices
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