252 Threads found on edaboard.com: Lookup
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About EDAboard.com :: 07-09-2011 06:22 :: mister_rf :: Replies: 4 :: Views: 2110
The switch/case statements compiled to assembly, may use pointer instructions ( lookup access ) while if/else statements must evaluate every expressions.
Microcontrollers :: 06-18-2011 21:45 :: andre_teprom :: Replies: 15 :: Views: 1267
The lee_rotulo seems to be using eeprom, though not sure why without translating / understanding all that code.
The DT is similar to a lookup table and just a means of holding the data you want to display.
Unlike a conventional 2x16 lcd where the pic sends ascii characters to it, the nokia /glcd needs the message text to be broken down and
Microcontrollers :: 06-15-2011 20:25 :: wp100 :: Replies: 5 :: Views: 1817
It's indeed a ROM generated by Xilinx' toolchain - like said above probably a lookup table of 64 bytes (maybe the header of the UDP telegram?)
PLD, SPLD, GAL, CPLD, FPGA Design :: 05-10-2011 08:40 :: lucbra :: Replies: 10 :: Views: 1332
It sounds as though you're using a method that will have lookup tables consisting of partial sine waves. First and last values may be far apart.
This will result in sudden transitions at the speaker. You'll get harsh sounding sine waves.
You only need one lookup table. You stated your memory has room for 44 x 256 steps. It must contain one e
PLD, SPLD, GAL, CPLD, FPGA Design :: 05-10-2011 09:00 :: BradtheRad :: Replies: 3 :: Views: 3100
For decoding I'm using cheap Si diodes like
Key pressing is sensed via PORTB pin change IT, an the TIMER2 is used for a 20 msec debouncing.
lookup table to define key return values.
Sensing depressed key(s) at power on.
Show your DIY :: 05-07-2011 10:11 :: zuisti :: Replies: 4 :: Views: 2333
You will need a block of RAM that takes the values of your calculations.
The LUT that was referred to is a lookup Table, not the LUT that is a hardware part of a logic element within an FPGA.
PLD, SPLD, GAL, CPLD, FPGA Design :: 05-03-2011 08:21 :: lucbra :: Replies: 13 :: Views: 4506
well, I don't know too much, but firstly there is I^2 * R loss. varying the AWG will change the R. So lookup the conductance of copper, and the diameter of the copper wire and I'm sure you can calculate the DC....
hmm....yeah but transformers are more complicated......
Also there is the fact that for high frequency power transformers,
Power Electronics :: 04-27-2011 05:27 :: xaccto :: Replies: 4 :: Views: 2384
am doing a 16-QAM modulator using simulink, i had a trouble in the lookup table ,used to generate amplitude levels, i dunnu if there is a standard or if i should just put any different values? and there is another problem with the demux! if someone can provide me with an .mdl file that will be great :)
sorry for the poor English
Digital communication :: 04-09-2011 21:45 :: amy39sd :: Replies: 6 :: Views: 4844
I would also consider a lookup table.
But if you want to use taylor series (and the sine doesn't need to be exact), with a bunch of multipliers, a couple of adders and some dividers, you can do the trick...
sin(x) = x + x^3/6 could give a result close enough (if you known beforehand what angles you're dealing with).
PLD, SPLD, GAL, CPLD, FPGA Design :: 04-07-2011 19:42 :: lucbra :: Replies: 13 :: Views: 16199
Hello. The switching frequency of my inverter design very high that the frequency ratio irequires the use of 420 steps in the lookup table.The question is for pic16f877 is the memory and resolution sufficient to cater for this table as well as the main PWM program in asm.
Microcontrollers :: 03-19-2011 11:45 :: gedza :: Replies: 0 :: Views: 1385
Less compute intensive lookup table method is the best known way for software implementation.
Microcontrollers :: 03-16-2011 06:09 :: Jack// ani :: Replies: 14 :: Views: 4864
To send a character to a glcd you have to lookup that character from a font table, which then sends out the correct pattern to turn on the required pixels to make up that character.
Before you start using a glcd you have know the type of glcd - say TS12864 , what its driver / controller are KS0107/kS0108 and what you are coding with.
Microcontrollers :: 03-08-2011 09:14 :: wp100 :: Replies: 3 :: Views: 1141
Database loading in C/C++ can be done in many ways. If you want pure M$ approach, you can use the drivers that come with VC. If you want cross platform approach, install an ODBC driver for the database, and lookup ODBC programming in C++ on google. ODBC programming is more 'C' style and not at all easy. A better way is to use a Object Relational Ma
PC Programming and Interfacing :: 03-07-2011 07:12 :: kashokshenoy :: Replies: 2 :: Views: 1021
Can we read RTD temperatures without lookup tables. If yes can somebody explain me how.
Microcontrollers :: 03-01-2011 18:05 :: prmurthy :: Replies: 6 :: Views: 2942
It is more of a programming problem, than analog, I would have thought. You have an ADC in the PIC so you digitise it and either calculate the required output or use a lookup table. You will need an external DAC for the output.
Analog Circuit Design :: 02-28-2011 14:45 :: keith1200rs :: Replies: 11 :: Views: 1287
Can somebody post a complete Table lookup CRC algorithm VHDL code? I can't find any.
PLD, SPLD, GAL, CPLD, FPGA Design :: 01-31-2011 17:41 :: Yihan :: Replies: 12 :: Views: 2398
Arithmetic functions (e.g. sqrt, division) are operating on numbers, not bits. These numbers have a digital representation. The first point, when thinking about lookup tables, is to specify numeric ranges and resolutions, then about a suitable numeric format, mostly fixed point.
There's a large amount of contributions related to lookup ta
Microcontrollers :: 02-02-2011 08:57 :: FvM :: Replies: 3 :: Views: 1957
anyone tell lookup concept in VHDL?
PLD, SPLD, GAL, CPLD, FPGA Design :: 01-28-2011 08:51 :: rajeswari01 :: Replies: 0 :: Views: 1014
how to create lookuptable for sin(4(pi)x) and cos(20(pi)x) in VHDL, The x range is -4 :1/32:4... i.e., 256 values..Anyone help me...
PLD, SPLD, GAL, CPLD, FPGA Design :: 01-25-2011 07:24 :: rajeswari01 :: Replies: 22 :: Views: 11911