18–4
Altera Corporation
Stratix GX Device Handbook, Volume 2
July 2005
DSP Block Overview
× 18 multiplier.
Figure 18–2. DSP Block in 18
× 18 Mode
Adder/
Subtractor/
Accumulator
Adder/
Subtractor/
Accumulator
Adder
Multiplier Block
Output
Register
PRN
CLRN
D
Q
ENA
PRN
CLRN
D
Q
ENA
PRN
CLRN
D
Q
ENA
PRN
CLRN
D
Q
ENA
PRN
CLRN
D
Q
ENA
PRN
CLRN
D
Q
ENA
PRN
CLRN
D
Q
ENA
PRN
CLRN
D
Q
ENA
PRN
CLRN
D
Q
ENA
PRN
CLRN
D
Q
ENA
PRN
CLRN
D
Q
ENA
PRN
CLRN
D
Q
ENA
Optional Serial Shift Register
Inputs from Previous
DSP Block
From the Row
Interface Block
Summation
Block
Pipeline
Register
Adder Output Block