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EP2AGX65 Datasheet(PDF) 80 Page - Altera Corporation

Part # EP2AGX65
Description  Device Interfaces and Integration
Download  380 Pages
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Manufacturer  ALTERA [Altera Corporation]
Direct Link  http://www.altera.com
Logo ALTERA - Altera Corporation

EP2AGX65 Datasheet(HTML) 80 Page - Altera Corporation

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Chapter 4: DSP Blocks in Arria II Devices
Simplified DSP Operation
Arria II Device Handbook Volume 1: Device Interfaces and Integration
December 2010
Altera Corporation
Simplified DSP Operation
In Arria II devices, the fundamental building block is a pair of 18 × 18-bit multipliers
followed by a first-stage 37-bit addition and subtraction unit shown in Equation 4–1
and Figure 4–2. For all signed numbers, input and output data is represented in
2’s-complement format only.
The structure shown in Figure 4–2 is useful for building more complex structures,
such as complex multipliers and 36 × 36 multipliers, as described in later sections.
Each Arria II DSP block contains four two-multiplier adder units
(2 two-multiplier adder units per half block). Therefore, there are eight 18 × 18
multiplier functionalities per DSP block. For a detailed diagram of the DSP block,
refer to Figure 4–5 on page 4–8.
Following the two-multiplier adder units are the pipeline registers, the second-stage
adders, and an output register stage. You can configure the second-stage adders to
provide the alternative functions shown in Equation 4–1 and Equation 4–2 per half
block.
Equation 4–1. Multiplier Equation
P[36..0] = A0[17..0] × B0[17..0] ± A1[17..0] × B1[17..0]
Figure 4–2. Basic Two-Multiplier Adder Building Block
DQ
DQ
A0[17..0]
A1[17..0]
B1[17..0]
B0[17..0]
P[36..0]
+/-
Equation 4–2. Four-Multiplier Adder Equation
Z[37..0] = P0[36..0] + P1[36..0]


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