EP3C10U256C6N Datasheet, PDF (55/274 Pages) Altera Corporation – Cyclone III Device Family Overview

Chapter 4: Embedded Multipliers in the Cyclone III Device Family
4–3
Architecture
In addition to the embedded multipliers in the Cyclone III device family, you can
implement soft multipliers by using the M9K memory blocks as look-up tables
(LUTs). The LUTs contain partial results from the multiplication of input data with
coefficients that implement variable depth and width high-performance soft
multipliers for low-cost, high-volume DSP applications. The availability of soft
multipliers increases the number of available multipliers in the device.
Table 4–2 lists the total number of multipliers available in the Cyclone III device
family using embedded multipliers and soft multipliers.
Table 4–2. Number of Multipliers in the Cyclone III Device Family
Device Family
Device
Embedded Multipliers
Soft Multipliers
(16 × 16) ⁽¹⁾
Total Multipliers ⁽²⁾
EP3C5
23
—
23
EP3C10
23
46
69
EP3C16
56
56
112
EP3C25
66
66
132
Cyclone III
EP3C40
126
126
252
EP3C55
156
260
416
EP3C80
244
305
549
EP3C120
288
432
720
EP3CLS70
200
333
533
EP3CLS100
276
483
759
Cyclone III LS
EP3CLS150
320
666
986
EP3CLS200
396
891
1287
Notes to Table 4–2:
(1) Soft multipliers are implemented in sum of multiplication mode. M9K memory blocks are configured with 18-bit data widths to support 16-bit
coefficients. The sum of the coefficients requires 18-bits of resolution to account for overflow.
(2) The total number of multipliers may vary, depending on the multiplier mode you use.
f For more information about M9K memory blocks of the Cyclone III device family,
refer to the Memory Blocks in the Cyclone III Device Family chapter.
f For more information about soft multipliers, refer to the Implementing Multipliers in
FPGA Devices application note.
Architecture
Each embedded multiplier consists of the following elements:
■ Multiplier stage
■ Input and output registers
■ Input and output interfaces
December 2011 Altera Corporation
Cyclone III Device Handbook
Volume 1