6–10 Altera Corporation
Stratix Device Handbook, Volume 2 July 2005
Architecture
Figure 6–5. Adder/Output Block
Adder/Subtractor/Accumulator Block
The adder/subtractor/accumulator is the first level of the adder/output
block. You can configure the block as an accumulator or as an
adder/subtractor.
Accumulator
When the adder/subtractor/accumulator is configured as an
accumulator, the output of the adder/output block feeds back to the
accumulator as shown in Figure 6–5. You can use the
Adder/
Subtractor/
Accumulator 0
Adder
Result A
Result B
Result C
Result D
addnsub1
accum_sload0
addnsub3
signa
signb
accum_sload1
Accumulator Feedback
Accumulator Feedback
overflow0
Adder/
Subtractor/
Accumulator 1
Output Select
Multiplexer
Output
Registers
overflow1
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