Achronix Speedster22i User Macro Guide Manual do Utilizador descarregar pdf (Página 191)

Multipliers BMACC56

Speedster22i Macro Cell Library

AchronixSemiconductorProprietary PAGE 174

rst_b input

Data Input B Register Reset (active-low). Asserting input rst_b per-

forms a synchronous reset of the Data Input b register upon the next

active edge of the clock, and will set the register to the value defined

by the rst_value_b parameter.

rst_sub input

Subtract Input Register Reset (active-low). Asserting input rst_sub

performs a synchronous reset of the Subtract Input Register upon

the next active edge of the clock, and will set the register to the value

defined by the rst_level_sub parameter.

rst_cin input

Carry In Input Register Reset (active-low). Asserting input rst_cin

performs a synchronous reset of the Carry In Input Register upon the

next active edge of the clock, and will set the register to the value

defined by the rst_level_cin parameter.

rst_mask_adda input

Adda Mask Input Register Reset (active-low). Asserting input

rst_mask_adda performs a synchronous reset of the Adda Mask

Input Register upon the next active edge of the clock, and will set the

rst_dout input

Dout Output Register Reset (active-low). Asserting input rst_dout

performs a synchronous reset of the Dout and Cout output registers

upon the next active edge of the clock, and will set the dout register

to the value defined by the reset_dout parameter. and will set the

cout register to the value defined by the rst_level_cout parameter.

cascade_in[55:0] input

Cascade In. The cascade input allows the 56-bit cascade_out output

of the previous BMACC56 block to be connected to the adda input of

the add/sub block. The cascade_out to cascade_in flows from the

bottom of the Speedster22i device to the top.

clk input

Clock. Data is clocked into the input and output registers at the

active edge of the clock input. The active edge of the clock input is

selected by setting the clock_edge parameter to the appropriate

value.

dout[55:0] output

Data Out. The dout[55:0] output is the 56-bit signed two’s comple-

ment output, where bit 55 is the most significant bit.

cout output

Carry Out. The cout bit is set high if a carry was generated out of the

add/sub block.

cascade_out[55:0] output

Cascade Out. Cascade_out may be fed to the next BMACC56 blocks

adda input. This can be used to help in the formation of sum-of-

products of multiple BMACC56 blocks when the sel_cascade_out

parameter is set to zero.

Name Type Description

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