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VHDL Answers to Frequently Asked Questions by Ben Cohen

By Ben Cohen

VHDL solutions to commonly asked Questions is a follow-up to the author's e-book VHDL Coding kinds and Methodologies (ISBN 0-7923-9598-0). On of entirety of his first e-book, the writer persevered instructing VHDL and actively participated within the comp. lang. vhdl newsgroup. in the course of his studies, he used to be enlightened by way of the various fascinating concerns and questions on the subject of VHDL and synthesis. those pertained to: misinterpretations within the use of the language; equipment for writing mistakes loose, and simulation effective, code for testbench designs and for synthesis; and normal ideas and instructions for layout verification. because of this wealth of public wisdom contributed by way of a wide VHDL neighborhood, the writer determined to behave as a facilitator of this data via accumulating diverse periods of VHDL concerns, and by means of elaborating on those issues via entire simulatable examples. This publication is meant in case you are seeking for an more advantageous talent in VHDL. Its target market contains: 1. Engineers. The publication addresses a collection of difficulties more often than not skilled by means of genuine clients of VHDL. It offers functional causes to the questions, and indicates useful ideas to the raised concerns. it's also applications to accomplish universal utilities, invaluable within the iteration of debug code upload testbench designs. those applications contain conversions to strings (the picture package), iteration of Linear suggestions Shift Registers (LFSR), a number of enter Shift sign up (MISR), and random quantity generators.

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Entity Conversion is port (A : in Unsigned(3 downto 0); B : inout Std_Logic_Vector(3 downto 0); end Conversion; VHDL Answers to Frequently Asked Questions 30 architecture Conversion a of Conversion is type Short_Typ is range -128 to 127; type Medium_Typ is range -32768 to 32767; subtype BetterShort_Typ is Integer range -128 to 127; subtype BetterMedium_Typ is Integer range -32768 to 32767; signal. signal. signal. signal. signal. signal. ,. ,. Unsg_s <= Unsigned(Std_s); assert false report String' (" 1011") ; severity note; end Test_Lbl; end conversion_a; ~~ Type conversion Do not confuse implicit type conversion with type qualification, used to resolve ambiguities in the typing rules of VHDL.

7-2 represents the same example, but includes a block header. Both examples synthesize in SynpliJY-Lite witl1 QuickLogic[81• entity BlkExmpl is port (A in B C end BlkExmpl; out out Bit_Vector(2 downto 0); Bit; Bit) ; 9 Elements architecture BlkExmpl_a of BlkExmpl is signal. -_ _ __ Architectural signal visible by ALL concurrent statements of architecture beqin Logic Lbl: b10ck signal. Local_s :. vhd) architecture BlkExmpl_a of BlkExmpl is signal. T_s : Bit; begin Logic_Lbl: b10ck port (Data in Bit_Vector(2 downto 0); OutB out Bit; Temp : out Bit); port map " - Port header with port declaration and (Data => A, port map.

2-4). Buffer ports have no correspondence in actual hardware and they impose restrictions on what can be connected to them. g. push-pull, open collector, or tri-state driver). The hardware driver decision is determined by the values of the signals supplied to the ports and by the directed technology. If a 'z' is assigned onto a port, the synthesizer will implement a tri-state or open collector hardware driver. g. '1' and '0') are assigned, with no 'Z', then a push-pull type of hardware driver will most likely be implemented.

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