1-6
ALM Resources
SV51002
2014.01.10
ALM Resources
Each ALM contains a variety of LUT-based resources that can be divided between two combinational adaptive
LUTs (ALUTs) and four registers.
With up to eight inputs for the two combinational ALUTs, one ALM can implement various combinations
of two functions. This adaptability allows an ALM to be completely backward-compatible with four-input
LUT architectures. One ALM can also implement any function with up to six inputs and certain seven-input
functions.
One ALM contains four programmable registers. Each register has the following ports:
?
?
?
?
Data
Clock
Synchronous and asynchronous clear
Synchronous load
Global signals, general-purpose I/O (GPIO) pins, or any internal logic can drive the clock and clear control
signals of an ALM register.
GPIO pins or internal logic drives the clock enable signal.
For combinational functions, the registers are bypassed and the output of the look-up table (LUT) drives
directly to the outputs of an ALM.
Note: The Quartus II software automatically configures the ALMs for optimized performance.
Figure 1-6: ALM High-Level Block Diagram for Stratix V Devices
shared_arith_in
carry_in
dataf0
Combinational/
Memory ALUT0
labclk
datae0
dataa
datab
6-Input LUT
adder0
reg0
datac
reg1
To General or
Local Routing
datad
datae1
dataf1
adder1
6-Input LUT
Combinational/
Memory ALUT1
reg2
shared_arith_out
carry_out
reg3
ALM Output
The general routing outputs in each ALM drive the local, row, and column routing resources. Two ALM
outputs can drive column, row, or direct link routing connections, and one of these ALM outputs can also
drive local interconnect resources.
Altera Corporation
Logic Array Blocks and Adaptive Logic Modules in Stratix V Devices
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