HDL


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HDL

(biochemistry)

HDL

HDL

(Hardware Description Language) A language used to describe the functions of an electronic circuit for documentation, simulation or logic synthesis (or all three). Although many proprietary HDLs have been developed, Verilog and VHDL are the major standards. The first book to provide side-by-side examples of subsets of both languages that could be simulated and synthesized was "HDL Chip Design" by Douglas J. Smith, published by Doone Publications, 1996. See Verilog and VHDL.


HDL Languages
VHDL and Verilog are the most popular HDLs. These examples show a circuit described in RTL in both languages and the resulting schematic of the gate level netlist created after synthesis (below). (Language and schematic examples from "HDL Chip Design" courtesy of Douglas J. Smith.)








References in periodicals archive ?
Comparison of diabetic and non-diabetic individuals, all parameters, except HDL concentration (p<0.002) and LDL/HDL (p<0.001) ratio, did not show any significant difference from each other.
They were surprised to find the connection to high HDL. Both people with low HDL and people with high HDL have a high risk of both contracting and of dying from an infectious disease.
The bad effects of very high HDL cholesterol were consistent even after controlling other risk factors for heart disease such as diabetes, smoking, and low-density lipoprotein (LDL or "bad") cholesterol.
Finally, each method measures a different component of HDL [i.e., apolipoprotein A1 (apo A1), cholesterol content, or particle number].
"HDL wouldn't be the first risk factor we've seen that is not a modifiable target.
"But with every negative trial, it will get harder and harder [to fund new HDL research], and we'll look for other targets," he said.
The relationship between increased levels of HDL cholesterol and early death is unexpected and not fully clear yet.
HDL is known to carry fatty molecules out of artery walls and transport them to the liver for disposal.
What causes this dysfunctionality, is not known, but probably is related to the effect of inflammation in the HDL-C sub fractions genes producing changes in the protein composition of HDL or changes in the HDL associated lipids or Apo A-1 Studies are in process to clarify this (14).
When comparison was made for fasting lipid profile, TC/HDL ratio and TG/HDL ratio, it was observed that the average total cholesterol, HDL cholesterol, TC/HDL ratio were insignificant.