EP1S30F780C7 Datasheet, PDF (81/864 Pages) Altera Corporation – Stratix Device Handbook, Volume 1

Stratix Architecture
The DSP block consists of the following elements:
■ Multiplier block
■ Adder/output block
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 Figure 2–32.
Figure 2–32. Multiplier Sub-Block within Stratix DSP Block
sign_a (1)
sign_b (1)
aclr[3..0]
clock[3..0]
ena[3..0]
shiftin B shiftin A
Data A
Data B
DQ
ENA
CLRN
DQ
ENA
CLRN
DQ
ENA
CLRN
Result
to Adder
blocks
Optional
Multiply-Accumulate
and Multiply-Add
Pipeline
shiftout B shiftout A
Note to Figure 2–32:
(1) These signals can be unregistered or registered once to match data path pipelines if required.
Altera Corporation
July 2005
2–57
Stratix Device Handbook, Volume 1