主要內容
1. Altera Hardware Description Language
例子
% a simple AHDL up counter, released to public domain 13 November 2006 %
% [block quotations achieved with percent sign] %
% like c, ahdl functions must be prototyped %
% PROTOTYPE:
FUNCTION COUNTER (CLK)
RETURNS (CNTOUT[7..0]); %
% function declaration, where inputs, outputs, andbidirectional pins are declared %
% also like c, square brakets indicate an array %
SUBDESIGN COUNTER
(
CLK :INPUT;
CNTOUT[7..0] :OUTPUT;
)
% variables can be anything from flip-flops (as in this case),tri-state buffers, state machines, to user defined functions %
VARIABLE
TIMER[7..0]: DFF;
% as with all hardware description languages, think of this less as an algorithm and more as wiring nodes together %
BEGIN
DEFAULTS
TIMER[].prn = VCC; % this takes care of d-ff resets %
TIMER[].clrn = VCC;
END DEFAULTS;
TIMER[].d = TIMER[].q + H"1";
END;
2. Analog Hardware Description Language
模擬硬體描述語言。
參考書目
Modeling with an Analog Hardware Description Language (The International Series in Engineering and Computer Science) (Hardcover)
by H. Alan Mantooth, Mike F. Fiegenbaum
