Altera Integer Arithmetic IP Manuel d'utilisateur télécharger pdf (Page 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

Send Feedback

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 156 157

Pas de commentaire

Altera Integer Arithmetic IP Manuel d'utilisateur Page 58