EP2C8T144I8N Datasheet, PDF (345/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1

Embedded Multipliers in Cyclone II Devices
The number of embedded multipliers per column and the number of
columns available increases with device density. Table 12–1 shows the
number of embedded multipliers in each Cyclone II device and the
multipliers that you can implement.
Table 12–1. Number of Embedded Multipliers in Cyclone II Devices
Device
EP2C5
EP2C8
EP2C20
EP2C35
EP2C50
EP2C70
Embedded
Multipliers
13
18
26
35
86
150
9 × 9 Multipliers
(1)
26
36
52
70
172
300
18 × 18
Multipliers (1)
13
18
26
35
86
150
Note to Table 12–1:
(1) Each device has either the number of 9 × 9 or 18 × 18 multipliers shown. The total
number of multipliers for each device is not the sum of all the multipliers.
In addition to the embedded multipliers, you can also implement soft
multipliers using Cyclone II M4K memory blocks. The availability of soft
multipliers increases the number of multipliers available within the
device. Table 12–2 shows the total number of multipliers available in
Cyclone II devices using embedded multipliers and soft multipliers.
Table 12–2. Number of Multipliers in Cyclone II Devices
Device
EP2C5
EP2C8
EP2C20
EP2C35
EP2C50
EP2C70
Embedded Multipliers
(18 × 18)
13
18
26
35
86
150
Soft Multipliers
(16 × 16) (1)
26
36
52
105
129
250
Total Multipliers
(2)
39
54
78
140
215
400
Notes to Table 12–2:
(1) Soft multipliers are implemented in sum of multiplication mode. The M4K
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 according to the multiplier mode used.
Altera Corporation
February 2007
12–3
Cyclone II Device Handbook, Volume 1