Altera Integer Arithmetic IP Manual do Utilizador descarregar pdf (Página 58)

The following settings are applied in this mode:

• The width of the dataa[] input (WIDTH_A) must be less than or equals to 17 bits

• The width of the datab[] input (WIDTH_B) must be less than or equals to 17 bits

• The number of multipliers must be set to 2

This mode is expressed in the following equation.

The following shows the pre-adder square mode of two multipliers.

Figure 6-5: Pre-adder Square Mode

Mult0

Mult1

result

+/-

Pre-adder Constant Mode

In this mode, one multiplier operand derives from the input port, and the other operand derives from the

internal coefficient storage. The coefficient storage allows up to 8 preset constants. The coefficient

selection signals are coefsel[0..3].

The following settings are applied in this mode:

• The width of the dataa[] input (WIDTH_A) must be less than or equals to 27 bits

• The width of the coefficient input must be less than or equals to 27 bits

• The datab[] port must be disconnected

This mode is expressed in the following equation.

The following figure shows the pre-adder constant mode of a multiplier.

UG-01063

2014.12.19

Pre-adder Constant Mode

6-5

ALTERA_MULT_ADD (Multiply-Adder)

Altera Corporation

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Altera Integer Arithmetic IP Manual do Utilizador Página 58