tailieunhanh - The VHDL Hardware Description Language

VHDL (VHSIC Hardware Description Language) is a language for describing hardware. Its requirement emerged during the VHSIC development program of the US Department of Defense. The department organized a work shop in 1981 to lay down the specifications of a language which could describe hardware at various levels of abstractions, could generate test signals and record responses, and could act as a medium of information exchange between the chip foundries and the CAD tool operators. | The VHDL Hardware Description Language ThS. Le Hoai Nghia nghialh@ February 2009 The VHDL Hardware Description Language - p. 1 44 Why HDLs 1970s SPICE transistor-level netlists An XOR built from four NAND gates .MODEL p PMOS .MODEL N NMOS Vdd .SUBCKT NAND A B Y Vdd Vss Ml Y A Vdd Vdd p M2 Y B Vdd Vdd p M3 Y A X Vss N M4 X B Vss Vss N .ENDS Vss XI A B II Vdd 0 NAND X2 A II 12 Vdd 0 NAND X3 B II 13 Vdd 0 NAND X4 12 13 Y Vdd 0 NAND The VHDL Hardware Description Language - p. 2 44 Why HDLs 1980s Graphical schematic capture programs The VHDL Hardware Description Language - p. 3 .

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