EP1S20F484C6N Altera, EP1S20F484C6N Datasheet - Page 573
![IC STRATIX FPGA 20K LE 484-FBGA](/photos/6/72/67258/544-484-fbga_sml.jpg)
EP1S20F484C6N
Manufacturer Part Number
EP1S20F484C6N
Description
IC STRATIX FPGA 20K LE 484-FBGA
Manufacturer
Altera
Series
Stratix®r
Datasheet
1.EP1S10F484I6N.pdf
(864 pages)
Specifications of EP1S20F484C6N
Number Of Logic Elements/cells
18460
Number Of Labs/clbs
1846
Total Ram Bits
1669248
Number Of I /o
361
Voltage - Supply
1.425 V ~ 1.575 V
Mounting Type
Surface Mount
Operating Temperature
0°C ~ 85°C
Package / Case
484-FBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Gates
-
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Part Number:
EP1S20F484C6N
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Altera Corporation
July 2005
cleared for the next accumulation cycle, and you can use an external latch
to preserve the signal. You can use the addnsub[1..0] signals to
perform accumulation or subtraction dynamically.
1
Two-Multiplier Adder Mode
The two-multiplier adder mode uses the adder/output block to add or
subtract the outputs of the multiplier block, which is useful for
applications such as FFT functions and complex FIR filters. Additionally,
in this mode, the DSP block outputs two sums or differences for
multipliers up to 18 bits, or 4 sums or differences for 9-bit or smaller
multipliers. A single DSP block can implement one 18
multiplier or two 9
A complex multiplication can be written as:
In this mode, a single DSP block calculates the real part (a
one adder/subtractor/accumulator and the imaginary part (a
using another adder/subtractor/accumulator for data up to 18 bits.
Figure 6–13
to 9 bits, the DSP block can perform two complex multiplications using
four one-level adders. Resources outside of the DSP block route each
input to the two multiplier inputs.
1
(a + jb)
If you want to use DSP blocks and your design only has an
accumulator, you can use a multiply by one followed by an
accumulator to force the software to implement the logic in the
DSP block.
You can only use the adder block if it follows multiplication
operations.
shows an 18-bit complex multiplication. For data widths up
(c + jd) = (a
9-bit complex multipliers.
c – b
DSP Blocks in Stratix & Stratix GX Devices
d) + j
Stratix Device Handbook, Volume 2
(a
d + b
c)
18-bit complex
c – b
d + b
d) using
6–23
c)
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