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Chapter 15: Arithmetic Library
Table 15–64. Inputs and Outputs
15–43
a
b
ab
Port
Direction
Input
Input
Input
Description
Up to 18 bit input to 18x18+36 mode.
Up to 18 bit input to 18x18+36 mode.
Up to 36 bit input to 18x18+36 mode.
Availability
Only in 18x18+36 mode.
Available for other than complex and 18x18+36
a0
(scanin)
Input
First input to first multiplier or preadder.
modes.
If you enable Use scanin input , this block names this
port scanin and connects it to scan chain input in
generated HDL, otherwise it connects it to data input.
b0
c0
coef_sel0
a1
b1
c1
coef_sel1
a2
b2
c2
coef_sel2
a3
b3
c3
coef_sel3
chainin
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Second input to the first multiplier or
preadder.
If you use preadder, a second input to the
first multiplier.
Input to select coefficient from the ROM
First input to second multiplier or
preadder.
Second input to the second multiplier or
preadder.
If you use preadder, second input to the
second multiplier.
Input to select coefficient from the ROM
First input to third multiplier or preadder.
Second input to the third multiplier or
preadder.
If you use preadder, a second input to the
third multiplier.
Input to select coefficient from the ROM
First input to third multiplier or preadder.
Second input to the third multiplier or
preadder.
If you use preadder, a second input to the
third multiplier.
Input to select coefficient from the ROM
Input to chain adder. Drive only by a
chainout output of other Variable
Precision DSP block.
Available if CoefRom not enabled, or if preadder is
enabled.
Available if preadder is enabled, but coefficient ROM
not.
Available if coefficient ROM is enabled.
Available if there are at least two multipliers and input
scan chain is disabled.
Available if there are at least 2 multipliers and
coeffficient ROM not enabled, or if preadder is
enabled.
Available if there are at least 2 multipliers and if
preadder is enabled, but coefficient ROM not.
Available if there are at least 2 multipliers and if
coefficient ROM is enabled.
Available if there are at least 3 multipliers and input
scan chain is disabled.
Available if there are at least 3 multipliers and
coefficient ROM not enabled, or if preadder is
enabled.
Available if there are at least 3 multiplier and if
preadder is enabled, but coefficient ROM not.
Available if there are at least 3 multipliers and if
coefficient ROM is enabled.
Available if there are 4 multipliers and input scan
chain is disabled.
Available if there are 4 multipliers. and coefficient
ROM not enabled, or if preadder is enabled.
Available if there are 4 multiplier and if preadder is
enabled, but coefficient ROM not.
Available if there are 4 multipliers and if coefficient
ROM is enabled.
Available only in non complex modes, when
chianout adder is available and the input is enabled.
November 2013
Altera Corporation
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
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