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8. Using Black Boxes for HDL Subsystems
The Signal Compiler block converts subsystems with blocks from the DSP Builder
block libraries into HDL code. Non-DSP Builder blocks, such as encapsulations of
your own pre-existing HDL code, require the Signal Compiler block to recognize
them as black boxes so that the conversion process does not alter them.
There are two types of black-box interface in DSP Builder: implicit and explicit.
Implicit Black Box Interface
Use the HDL Import block to infer the implicit black-box interface.
The Signal Compiler block recognizes the HDL Import block as a black box and
bypasses this block during the HDL translation.
f For information about the HDL Import block, refer to the block description in the
AltLab Library chapter of the DSP Builder Standard Blockset Libraries section in volume 2
of the DSP Builder Handbook .
Explicit Black-Box Interface
Use the HDL Input , HDL Output , HDL Entity , and Subsystem Builder blocks to specify
the explicit black-box interface.
Using the HDL Input , HDL Output , and HDL Entity blocks prevents Signal Compiler
from translating the subsystem into HDL. You can also use a Subsystem Builder
block to create a new subsystem and then automatically populate its ports using the
specified HDL.
Typically use the explicit black-box interface to encapsulate non-DSP Builder blocks
from the main Simulink blocksets.
f For information about the HDL Input , HDL Output , HDL Entity , and Subsystem
Builder blocks, refer to the block descriptions in the AltLab Library chapter of the DSP
Builder Standard Blockset Libraries section in volume 2 of the DSP Builder Handbook .
HDL Import Design Example
The HDL Import block provides an interface to import a HDL module into your DSP
Builder design.
1
To define imported VHDL use std_logic_1164 types. If your design uses any other
VHDL type definitions (such as arithmetic or numeric types), write a wrapper that
converts them to std_logic or std_logic_vector .
The following sections show an example of importing an existing VHDL design into
the DSP Builder environment with the HDL Import block.
November 2013
Altera Corporation
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
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