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DIFFCLK_1P Cyclone III Device Handbook
Prototype PCB
Part No.:   DIFFCLK_1P
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Description:   Cyclone III Device Handbook
File Size :   7302 K    
Page : 274 Pages
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4–4
Chapter 4: Embedded Multipliers in the Cyclone III Device Family
Architecture
shows the multiplier block architecture.
Figure 4–2. Multiplier Block Architecture
signa
signb
aclr
clock
ena
Data A
D
ENA
Q
Data Out
D
Q
ENA
CLRN
CLRN
Data B
D
ENA
Q
Input
Register
Output
Register
CLRN
Embedded Multiplier Block
Input Registers
You can send each multiplier input signal into an input register or directly into the
multiplier in 9- or 18-bit sections, depending on the operational mode of the
multiplier. Each multiplier input signal can be sent through a register independently
of other input signals. For example, you can send the multiplier
Data A
signal through
a register and send the
Data B
signal directly to the multiplier.
The following control signals are available to each input register in the embedded
multiplier:
clock
clock enable
asynchronous clear
All input and output registers in a single embedded multiplier are fed by the same
clock, clock enable, and asynchronous clear signals.
Multiplier Stage
The multiplier stage of an embedded multiplier block supports 9 × 9 or 18 × 18
multipliers as well as other multipliers in between these configurations. Depending
on the data width or operational mode of the multiplier, a single embedded multiplier
can perform one or two multiplications in parallel. For multiplier information, refer to
Each multiplier operand is a unique signed or unsigned number. Two signals,
signa
and
signb,
control an input of a multiplier and determine if the value is signed or
unsigned. If the
signa
signal is high, the
Data A
operand is a signed number. If the
signa
signal is low, the
Data A
operand is an unsigned number.
Cyclone III Device Handbook
Volume 1
December 2011 Altera Corporation
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