Cyclone II Architecture
Embedded multipliers can operate at up to 250 MHz (for the fastest speed
grade) for 18 × 18 and 9 × 9 multiplications when using both input and
output registers.
Each Cyclone II device has one to three columns of embedded multipliers
that efficiently implement multiplication functions. An embedded
multiplier spans the height of one LAB row. Table 2–10 shows the number
of embedded multipliers in each Cyclone II device and the multipliers
that can be implemented.
Table 2–10. Number of Embedded Multipliers in Cyclone II Devices
Note (1)
Embedded
Multiplier Columns
Embedded
Multipliers
Device
9 × 9 Multipliers 18 × 18 Multipliers
EP2C5
EP2C8
1
1
1
1
1
2
3
13
18
26
36
13
18
EP2C15
EP2C20
EP2C35
EP2C50
EP2C70
26
52
26
26
52
26
35
70
35
86
172
300
86
150
150
Note to Table 2–10:
(1) Each device has either the number of 9 × 9-, or 18 × 18-bit multipliers shown. The total number of multipliers for
each device is not the sum of all the multipliers.
The embedded multiplier consists of the following elements:
■
■
■
Multiplier block
Input and output registers
Input and output interfaces
Figure 2–18 shows the multiplier block architecture.
Altera Corporation
February 2007
2–33
Cyclone II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
