Altera Stratix - Adder;Output Block

Altera Corporation 6–9
July 2005 Stratix Device Handbook, Volume 2
DSP Blocks in Stratix & Stratix GX Devices
Adder/Output Block
The adder/output block has the following elements (See Figure 6–5 on
page 6–10):
■ An adder/subtractor/accumulator block
■ A summation block
■ An output select multiplexer
■ Output registers
You can configure the adder/output block as:
■ A pure output interface
■ An accumulator
■ A simple one-level adder
■ A two-level adder with dynamic addition/subtraction control on the
first-level adder
■ The final stage of a 36-bit multiplier
The output select multiplexer sets the output of the DSP block. You can
register the adder/output block’s output using the output registers.
1 You cannot use the adder/output block independently of the
multiplier.