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Arria II Device Handbook

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Chapter 2: Logic Array Blocks and Adaptive Logic Modules in Arria II Devices

2–9

Adaptive Logic Modules

For the packing of two 5-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 4-input function with a 5-input function requires one common input (either dataa

or datab).

In the case of implementing two 6-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 ALM may be implemented in separate ALMs by

the Quartus II software to achieve the best possible performance. As a device begins

to fill up, the Quartus II software automatically utilizes the full potential of the

Arria II ALM. The Quartus II Compiler automatically searches for functions using

common inputs or completely independent functions to be placed in one ALM to

make efficient use of device resources. In addition, you can manually control resource

usage by setting location assignments.

Any 6-input function can be implemented using inputs dataa, datab, datac, datad,

and either datae0 and dataf0 or datae1 and dataf1. If datae0 and dataf0 are utilized,

the output is driven to register0, and/or register0 is bypassed and the data drives

out to the interconnect using the top set of output drivers (refer to Figure 2–8). If

datae1 and dataf1 are used, the output either drives to register1 or bypasses

register1 and drives to the interconnect using the bottom set of output drivers. The

Quartus II Compiler automatically selects the inputs to the LUT. ALMs in normal

mode support register packing.

Figure 2–8. Input Function in Normal Mode (Note 1)

dataf0

datae0

dataa

datab

datac

datad

datae1

dataf1

(2)

6-Input

LUT

labclk

DQ

reg0

DQ

reg1

To general or

local routing

To general or

local routing

To general or

local routing

Notes to Figure 2–8:

(1) If datae1 and dataf1 are used as inputs to a 6-input function, datae0 and dataf0 are available for register packing.

(2) The dataf1 input is available for register packing only if the 6-input function is unregistered.

December 2010 Altera Corporation

Arria II Device Handbook Volume 1: Device Interfaces and Integration

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