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Chapter 15: Arithmetic Library
15–39
The block accepts from one to four groups of inputs A , B , C , coef_sel to multipliers.
Each set of inputs depends on the parameters you select.
You can select input scan chaining for A inputs only. This feature requires you to
enable all input registers. For Stratix V devices, it is available in 18-bit modes only.
Enable input scan only when you disable preadder. For Arria and Cyclone V devices,
in 18-bit modes input you can combine the scan chain with the preadder. For 27-bit
modes, enable it only when you disable the preadder.
You can optionally add or subtract the results of the second and forth multipliers from
the result. You can control the operation dynamically by enabling a special control
input. The block subtracts the first operand from the second.
For the configurations with input data widths less than 27 (more than 18 in case of one
multiplier) and at most two multipliers the chaining and accumulation feature is
available.
You can dynamically negate the result of multiplications and additions before passing
to accumulation.
Control the accumulation using the special control input. When the accumulation
control port is low, load a rounding constant into an accumulator. Otherwise, the
block loads 0.
When available, enable the output chaining using chainin and chainout ports. The
chainout port on one block can only feed the chainin on another.
The block exposes up to three enable signals. Each register can chose between any of
these enable signals.
The block has two dedicated asynchronous clear signals: aclr0 for input registers,
aclr1 for output registers.
Parameters
Table 15–59 shows the basic structure parameters.
Table 15–59. basic Structure Parameters
Name
Device Family
Value
Arria V
Cyclone V
Description
Specifies the target device family.
Stratix V
Specifies whether the block operates in one of the separately treated
25x18 Complex Mode
modes (25x18 Complex, 18x18+38 modes). For these modes the set
Use block for
Number of Multipliers
18x18+36 Mode
Other Modes
1, 2, 3, 4
of inputs provided for the block differs from the general pattern used
for the other blocks.
The 25x18 Complex Mode is available only for Stratix V devices.
Specifies the number of multipliers. The 3 and 4 options are valid for
Stratix V devices only.
For Stratix V devices only, you can configure the block to operate in 25x18 complex
mode. In this mode, the block accepts real and imaginary components of two complex
operands and outputs real and imaginary components of the multiplication result
separately.
November 2013
Altera Corporation
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
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