EP4SE360F35I4 Datasheet, PDF (103/432 Pages) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

Chapter 4: DSP Blocks in Stratix IV Devices
Stratix IV Operational Mode Descriptions
4–23
Figure 4–14. Two-Multiplier Adder Mode Shown for a Half DSP Block
clock[3..0]
ena[3..0]
aclr[3..0]
signa
signb
output_round
output_saturate
overflow (1)
dataa_0[17..0]
datab_0[17..0]
+
dataa_1[17..0]
result[ ]
datab_1[17..0]
Half-DSP Block
Note to Figure 4–14:
(1) Block output for accumulator overflow and saturate overflow.
February 2011 Altera Corporation
Stratix IV Device Handbook
Volume 1