EP2S90F1020C5 Datasheet, PDF (520/768 Pages) Altera Corporation – Stratix II Device Handbook, Volume 1

DSP Block Overview
In addition to the DSP block multipliers, you can use the Stratix II or
Stratix II GX device’s TriMatrix memory blocks for soft multipliers. The
availability of soft multipliers increases the number of multipliers
available within the device. Table 6–3 shows the total number of
multipliers available in Stratix II devices using DSP blocks and soft
multipliers.
Table 6–3. Number of Multipliers in Stratix II Devices
Device
EP2S15
EP2S30
EP2S60
EP2S90
EP2S130
EP2S130
DSP Blocks
(18 × 18)
48
64
144
192
252
384
Soft Multipliers
Total
(16 × 16) (1), (2) Multipliers (3), (4)
100
148 (3.08)
189
253 (3.95)
325
469 (3.26)
509
701 (3.65)
750
1,002 (3.98)
962
1,346 (3.51)
Notes to Table 6–3:
(1) Soft multipliers implemented in sum of multiplication mode. RAM blocks are
configured with 18-bit data widths and sum of coefficients up to 18-bits.
(2) Soft multipliers are only implemented in M4K and M512 TriMatrix memory
blocks, not M-RAM blocks.
(3) The number in parentheses represents the increase factor, which is the total
number of multipliers with soft multipliers divided by the number of 18 × 18
multipliers supported by DSP blocks only.
(4) The total number of multipliers may vary according to the multiplier mode used.
6–4
Stratix II Device Handbook, Volume 2
Altera Corporation
January 2008