EP1S20F672C7N Datasheet, PDF (582/864 Pages) List of Unclassifed Manufacturers – Stratix Device Handbook, Volume 1

TriMatrix Memory Overview
Each DSP block supports either eight 9 × 9-bit multipliers, four 18-bit
multipliers, or one 36 × 36-bit multiplier. These multipliers can feed an
adder or an accumulator unit based on the operation mode. Table 7–3
shows the different operation modes for the DSP blocks.
Table 7–3. Operation Modes for DSP Blocks
DSP Block Mode
Simple multiplier
Multiply-accumulate
Two-multipliers adder
Four-multipliers adder
Number & Size of Multipliers per DSP Block
9 x 9-bit
18 x 18-bit
36 x 36-bit
Eight multipliers with
eight product outputs
Two multiply and
accumulate (34 bit)
4 two-multipliers adders
2 four-multipliers adder
Four multipliers with four One multiplier with one
product outputs
product output
Two multiply and
accumulate (52 bit)
2 two-multipliers adders
1 four-multipliers adder
f
Implementing multipliers, multiply-adders, and multiply-accumulators
in the DSP blocks has a performance advantage over logic cell
implementation. Using DSP blocks also reduces logic cell and routing
resource consumption. To achieve higher performance, register each
stage of the DSP block to allow pipelining. For implementing
applications, such as FIR filters, efficiently use the input registers of the
DSP block as shift registers.
For more information on DSP blocks, see the DSP Blocks in Stratix &
Stratix GX Devices chapter.
TriMatrix
Memory
Overview
Stratix and Stratix GX devices feature the TriMatrix memory structure,
composed of three sizes of embedded RAM blocks. These include the
512-bit size M512 block, the 4-Kbit size M4K block, and the 512-Kbit size
M-RAM block. Each block is configurable to support a wide range of
features.
Tables 7–4 and 7–5 show the number of memory blocks in each Stratix
and Stratix GX device, respectively.
Table 7–4. TriMatrix Memory Resources in Stratix Devices (Part 1 of 2)
Device
EP1S10
EP1S20
EP1S25
M512
94
194
224
M4K
M-RAM
60
1
82
2
138
2
7–4
Stratix Device Handbook, Volume 2
Altera Corporation
September 2004