Altera Stratix - Page 262

6–4 Altera Corporation
Stratix Device Handbook, Volume 2 July 2005
DSP Block Overview
Figure 6–2 shows the DSP block operating as an 18 × 18 multiplier.
Figure 6–2. 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