ep1sgx25d Altera Corporation, ep1sgx25d Datasheet - Page 118

• Manufacturer Part Number: ep1sgx25d
• Description: Stratix Gx Device Family Data Sheet
• Manufacturer: Altera Corporation

Digital Signal Processing Block
Figure 4–31. Multiplier Sub-Block Within Stratix GX DSP Block
Note to
(1)
4–52
Stratix GX Device Handbook, Volume 1
These signals can be unregistered or registered once to match data path pipelines if required.
Figure
Data B
Data A
4–31:
shiftout B
shiftin B
shiftout A
The DSP block consists of the following elements:
■
■
Multiplier Block
The DSP block multiplier block consists of the input registers, a
multiplier, and pipeline register for pipelining multiply-accumulate and
multiply-add/subtract functions as shown in
ENA
ENA
D
D
Multiplier block
Adder/output block
CLRN
CLRN
clock[3..0]
sign_a (1)
sign_b (1)
shiftin A
aclr[3..0]
ena[3..0]
Q
Q
ENA
D
CLRN
Q
Figure
Optional
Multiply-Accumulate
and Multiply-Add
Pipeline
Result
to Adder
blocks
4–31.
Altera Corporation
February 2005