Stratix GX Architecture
Figure 4–33. Adder/Output Blocks
Note (1)
Accumulator Feedback
accum_sload0 (2)
Result A
overflow0
Adder/
Subtractor/
addnsub1 (2)
Accumulator1
Output Selection
Multiplexer
Result B
signa (2)
Summation
Output
Register Block
signb (2)
Result C
Adder/
Subtractor/
Accumulator2
addnsub3 (2)
overflow1
Result D
accum_sload1 (2)
Accumulator Feedback
Notes to Figure 4–33:
(1) Adder/output block shown in Figure 4–33 is in 18 × 18-bit mode. In 9 × 9-bit mode, there are four adder/subtractor
blocks and two summation blocks.
(2) These signals are either not registered, registered once, or registered twice to match the data path pipeline.
Altera Corporation
February 2005
4–57
Stratix GX Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
