ep1s25 Altera Corporation, ep1s25 Datasheet - Page 76

• Manufacturer Part Number: ep1s25
• Description: Stratix Device Family Data Sheet
• Manufacturer: Altera Corporation

Digital Signal Processing Block
Figure 2–34. Adder/Output Blocks
Notes to
(1)
(2)
2–62
Stratix Device Handbook, Volume 1
accum_sload0 (2)
accum_sload1 (2)
Adder/output block shown in
blocks and two summation blocks.
These signals are either not registered, registered once, or registered twice to match the data path pipeline.
addnsub1 (2)
addnsub3 (2)
Figure
signa (2)
signb (2)
Result C
Result D
Result A
Result B
2–34:
Figure 2–34
Accumulator1
Accumulator2
Subtractor/
Subtractor/
Note (1)
Adder/
Adder/
is in 18
×
Summation
18-bit mode. In 9 × 9-bit mode, there are four adder/subtractor
Accumulator Feedback
Accumulator Feedback
Altera Corporation
overflow0
overflow1
Output Selection
Multiplexer
Output
Register Block
July 2005