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clock transmission between 2 fpga
hello everybody !i have a project to realize, i.e. the connection of many fpga (board altera apex 20ke) into a network-on-chip. the main issue i have is that the has a frequency of 33.333mhz with a precision of +- 1ppm.so, when i send informations (s...
Digital communication :: 15 Mar 2006 16:09 :: flyjuju2 :: Replies: 0 :: Views: 165
final year project
hi friends,i am looking for a project....which include fpga(verilog),pcb and gui design..can somebody suggest me a project...or is there any chip/bridge, which is absoloute from the market....so i can use that as my project..looking forward for your ...
Hobby Circuits and Small Projects Problems :: 05 Mar 2006 17:27 :: tom_hanks :: Replies: 12 :: Views: 831
rf module question
can rf tx/rx module use computer serial communication encoding scheme to encode and decode?i want to connect the tx module to directly to my computer serial port and have it send out ascii data to the rx module....
Hobby Circuits and Small Projects Problems :: 27 Feb 2006 7:59 :: david90 :: Replies: 7 :: Views: 399
fm digital data broadcast project .i need suggestions
i have this design and i need to broadcast digital data somehow encoded in standart comercial fm transmision .88 -108 mhz could you suggest a coding scheme to use ,may be using a subcarrier ?? any links ??...
Digital communication :: 22 Feb 2006 15:14 :: haydaa :: Replies: 10 :: Views: 659
"rf-pic-serial port" based project
im having a problem about pic programing. i have an lcd display and rf receiver connected to the lcd.when i type some text information on my computer; the information will be sent to the transmitter via serial port and then to the receiver of the lcd...
Hobby Circuits and Small Projects Problems :: 16 Feb 2006 7:50 :: Slayerza :: Replies: 5 :: Views: 741
best of line formats!
there exists so many line formats or digital encoding to illustarate one and zeroes that comes from pcm,dmdpcm,adm like polarnrz-l,polar nrz-i,manchester,differential manchester,hdb3,bz8s and so on...how to find that which one is best...is there any...
Electronic Elementary Questions :: 10 Feb 2006 13:35 :: electronics_kumar :: Replies: 0 :: Views: 171
what is the difference betwwen analog and digital channel
i saw in one buk that analog signal travel in digital channel and opposite.wat is the actual difference...
Digital communication :: 09 Feb 2006 16:14 :: joinfaisal :: Replies: 6 :: Views: 885
wireless protocol for microcontrollers?
for wired communication we have protocols like as can,modbus,... between devices,what is a small protocol for wireless communication for 8 bit micros like as avr....
Microcontrollers :: 28 Dec 2005 19:26 :: silvio :: Replies: 7 :: Views: 756
resource about the 32-bit manchester adder?
dear all,can anyone give me some resources about the 32-bit manchester adder (such as schematic) ?thanks so much!!!...
ASIC Design Methodologies & Tools (Digital) :: 22 Dec 2005 15:37 :: shaq :: Replies: 0 :: Views: 177
beginner question in wireless
hello guysi have good experience in uc but not in wireless systems i want to make a project that connect about 10 to 20 uc boards to a single master uc and exchange data between the slaves and the master for around 50 meters distance between them.wha...
RF, Microwave, Antennas and Optics :: 11 Dec 2005 8:39 :: ZeleC :: Replies: 3 :: Views: 213
can anybody help me to make
can anybody help me to make the program of remote as well as push button operated led on /off controller using “c” language and at89c51 and any rc-5 coded remote controller. cause i’m a beginner in “uc” projects now i’m learn in 2nd year. 1) i don’t ...
Microcontrollers :: 12 Nov 2005 12:10 :: M!k :: Replies: 12 :: Views: 876
how can clock be recovered easily in manchester codin
how can clock be recovered easily in manchester codin...
Electronic Elementary Questions :: 29 Oct 2005 22:08 :: zorro :: Replies: 2 :: Views: 162
error checking/correction - small packs
i am linking two micros via ir, one way only, thus repetition can not be asked to the emitter.i am using the sonys sirc protocol. speed is the same used for remote controls for domestic appliances.whatever is received altered should be discarded or c...
Microcontrollers :: 22 Sep 2005 5:29 :: Buriedcode :: Replies: 1 :: Views: 291
wireless pic to pic
a 16f877 sends commands to three independent 16f628, each one pwm controlling the start / stop / reverse and speed of a dc motor or modified servo.for a wireless link i considered to use an ir diode emitting a common sony ir code with the instruction...
Microcontrollers :: 19 Sep 2005 22:11 :: atferrari :: Replies: 6 :: Views: 933
does anyone know this circuit
it resemble a bipolar brokaw bandgap structure. but i have not find any literature discribing it. can anybody give any infomation?...
Analog IC Design & Layout :: 17 Sep 2005 7:35 :: starcoming :: Replies: 12 :: Views: 720
encoder/decoder
hi everyone !can someone tell how encoder/decoder work ?when they are in rf transmission...in the tx & rx.tq !...
Hobby Circuits and Small Projects Problems :: 15 Sep 2005 18:39 :: syed intisar haider :: Replies: 11 :: Views: 1053
rf modules with at89c51 and serial communication protocol
hii use serial communication to transmitt simple 8-bit data with start and stop bits. in the transmitter circuit, you see two buttons which allow you to press one of them. when one of them has been pressed, i was expecting to see one led to swtich ...
Microcontrollers :: 28 Aug 2005 14:07 :: Maverickmax :: Replies: 14 :: Views: 2004
what is the usage of varactor ?
i know it can be used as capacitor in guard rings. what is the adavantage? larger capacitance? does it have other usage?...
Electronic Elementary Questions :: 25 Aug 2005 12:50 :: mario82 :: Replies: 6 :: Views: 459
serial comms in pic micros
hi, ive searched the board but i cant find an answer to this question,. and sorry if its in the wrong forum, but it is microcontrollers:can the spi peripheral of a pic micro send frames of data back to back. by that i mean the pic is constantly exc...
Microcontrollers :: 20 Aug 2005 17:37 :: Buriedcode :: Replies: 4 :: Views: 255
code ?
hi all, therere a lot of code ( such as manchester, nrz, ... and rc5).please help me about tutorial of those code...
Microcontrollers :: 19 Aug 2005 16:06 :: komandara :: Replies: 3 :: Views: 375
rfid detector design
can anyone help me to find resources about rf/id detector design?...
Other Design :: 18 Aug 2005 13:35 :: chentzin :: Replies: 18 :: Views: 20398
need help!!! read 64 bit manchester code using pic16f628a
does anyone have idea on how to read 64 bit manchester code using pic16f628a. i need it urgently. thanks!!...
Microcontrollers :: 16 Aug 2005 2:40 :: Buriedcode :: Replies: 1 :: Views: 732
manchester code encoding using assembly code for pic
does anyone has example of it?...
Microcontrollers :: 14 Aug 2005 14:57 :: Buriedcode :: Replies: 1 :: Views: 1359
how to control furniture by using tv remote control
hi everybody!now i want to control some devices in my house by using remote control. i have a samsung tv remote control but i have no its datasheet, so i can not know exactly what code is sent when i press a key. if you have this datasheet, pls send ...
RF, Microwave, Antennas and Optics :: 04 Aug 2005 6:09 :: Borber :: Replies: 6 :: Views: 354
manchester code
hiwhat is manchester code?...
Microcontrollers :: 20 Jul 2005 13:36 :: guttinasrinivas :: Replies: 6 :: Views: 675
1553 transceiver design.
how could i convert the manchester encoded ttl signal into 1553 bipolar trapezoidal waveforms suitable to be transmitted to 70Ω cable thru isolation and coupling transformers. and receive the bus data when not transmitting on the same line (conn...
Analog Circuit Design :: 11 Jul 2005 9:05 :: matrix1 :: Replies: 0 :: Views: 192
digital radio link
hello, i need some help to catch up again with radio communications. although i obtained my degree in communication five years ago, i did no practice in the field, since i switched my professional interest to embedded design. recently, i had to desig...
RF, Microwave, Antennas and Optics :: 24 Jun 2005 3:47 :: Buriedcode :: Replies: 2 :: Views: 501
why fsk encoding?
hi while trasmitting why fsk encoding is preffered ?or wat are the advantages of using fsk encoding.thanks niks...
RF, Microwave, Antennas and Optics :: 23 May 2005 1:59 :: biff44 :: Replies: 6 :: Views: 1012
digital clock / data recovery for an ultra low power ic
hi guys,im going to design a clock/data recovery circuit for an ultra low power ic.data comes in a manchester coded packet with length of about 120 bits and data rate of 40 to 80 kbps. to reduce the power consumption, we have to turn off the digital ...
ASIC Design Methodologies & Tools (Digital) :: 18 May 2005 8:23 :: layes2 :: Replies: 3 :: Views: 324
advise required 4 final year project wth fpga
dear all,thank you....first....i need some help on the topic on my final year project in my university.i hav some board wth altera fpga chip/s.... and i m still thinking of wad topic i should do wth these boards. i would b grateful if someone can sug...
PLD, SPLD, GAL, CPLD, FPGA Design :: 23 Apr 2005 6:47 :: Sparc :: Replies: 12 :: Views: 672
manchester coding
can some body give me c code to manchester encode and decode a byte of data .i am using pic18f452 mcu and c18 compiler.i need a function like encode(byte in) { return (byte [2] manchester); } decode(byte [2] manchester) { return(byte out); }...
Microcontrollers :: 07 Apr 2005 14:41 :: Buriedcode :: Replies: 4 :: Views: 519
serial interface between rf modules and pic18f452 mcu
i am using rf modules operating at 418 mhz with modulation scheme as cpca(carrier present carrier absent).rf transmitter have serial data input while rf receiver has serial data output.i interfaced the rf modules to the usart of pic18f452 mcu.sent da...
Microcontrollers :: 03 Apr 2005 15:22 :: Mr_Programmer :: Replies: 8 :: Views: 990
rf tranceiver problem
iam using rf transmitter txm-418-lr and rf receiver rxm-418-lr from linx technologies both modules are connected with the mcu pic18f452modules have seperate antennas.i am using them as half duplex tranceivertransmitters datain pin is connected to tx ...
RF, Microwave, Antennas and Optics :: 02 Apr 2005 15:37 :: FANT :: Replies: 8 :: Views: 501
pll
can pll control any frequency deviation of vco or it is only sensitive to phase if it can control the frequency deviation than how much frequency deviation it can control (approx value) if vco is in s-band...
RF, Microwave, Antennas and Optics :: 27 Mar 2005 4:00 :: RFDave :: Replies: 3 :: Views: 414
reading serial inf. from parellel port(some off topic)
hi!we will sent a byte or stream of bytes to the pc parellel port serially(with pic mcu)...and parallel port should know baud rate(bytes may be in different baud rates) and values of the bytes...we will use c++ with inport and outport functions(we wi...
Microcontrollers :: 24 Mar 2005 11:12 :: sinbeloanthi :: Replies: 7 :: Views: 516
decision about what 'type' of micro to use
i having real trouble deciding what type of microcontroller to use for my app. heres the specs:read in data from a i2s bus, 32ksps, 20-24 bits.encode with fec and add extra control bits.encode with manchester encoding, with preamble and word sync.o...
Microcontrollers :: 04 Mar 2005 23:44 :: Buriedcode :: Replies: 4 :: Views: 276
how to transmit data over 2-wire dc power line ( e.g 5v)
hi,does anybody heard about cicrcuits that can transmit serial data and suply circuits over 1-pair (2-wire only ) power line. ( up to 2400...4800 bd, up to 2000ft. )ive heard about hart protocol, but its industrial one. i want make my own drivers an...
Microcontrollers :: 01 Mar 2005 12:23 :: vdaniel :: Replies: 12 :: Views: 2763
em4095 manchester encoding
helloi am using rfid reader iic em4095 interfacted to at89s52 i want to use manchester encoding can this ic em4095 support manchester encoding. regards...
Microcontrollers :: 20 Feb 2005 23:19 :: radiofm :: Replies: 5 :: Views: 2460
bit synchronizer for manchester nrz code
hi all,im designing a uhf passive rfid tag (type-b of iso-18000-6). the date link coding from reader to tag is 40k bps manchester nrz. the frame contains nine 0-1s preamble preceding the delimitter field and data field. i measure the time durations o...
RF, Microwave, Antennas and Optics :: 19 Feb 2005 8:35 :: vale :: Replies: 0 :: Views: 390
rfpic12f675 projects
looking for projects using this brand new pic :)1/3 - 2/3 or manchester encodingthx...
Microcontrollers :: 15 Feb 2005 17:53 :: jcding1980 :: Replies: 8 :: Views: 4002
how is frontpanel embossing done?
anyone who knows how this is done? i have found a company that can print on lexan and other plastic really cheap (for advertising), i have found a company that can make cutting dies for practically nothing. i have also tried with a die to cut holes i...
Professional Hardware and Electronics Design :: 20 Jan 2005 21:12 :: abc123 :: Replies: 6 :: Views: 528
how to write this vhdl program to convert codes??? thanks !
hello, i want to use nrz(non return to zero) for input,then convert to manchester code, how can i write this program ???any reference ? thanks !...
PLD, SPLD, GAL, CPLD, FPGA Design :: 16 Jan 2005 11:01 :: arunragavan :: Replies: 3 :: Views: 795
clock and data recovery circuit
hi all, i need to design a 10mhz clock and data recovery circuit . anyone has some ideas on this subject ( includes phase detector , vco and others )?...
Analog Circuit Design :: 18 Dec 2004 12:21 :: aicer :: Replies: 10 :: Views: 2109
differentiating between manchester and biphase
hi,i need to check a data stream to know if it is coded in manchester(biphase-l) or biphase-m, before decoding it on a microcontroller.manchester codes a 1 by a high to low transition, and a 0 by a low to high transition (transitions are in the midd...
Microcontrollers :: 30 Nov 2004 0:46 :: albert22 :: Replies: 4 :: Views: 519
manchester encoded
hii am doing a project i am looking for manchester encoded data and decoding routine for atmel 89s52. can anyone poast the routine.thanks...
Microcontrollers :: 29 Nov 2004 10:13 :: C-Man :: Replies: 1 :: Views: 390
question about connectionspeed
i am interested in developing with rfids. at my research i found a developmentkit produced by sonmicro. by reading the datasheed i found a description, which i do not understand. the board could use manchester rf/32 and manchester rf/64 modulations, ...
Digital Signal Processing :: 31 Oct 2004 9:30 :: dora :: Replies: 4 :: Views: 240
wireless digital audio, the saga continues...
hi,i posted several questions in this forum about a project of mine that ive been working on, on and off for about 2 years. its a wireless digital audio system for musical instruments. heres the rough specs..resolution: 16 bit. cs5330a adc, stereo, ...
Hobby Circuits and Small Projects Problems :: 29 Oct 2004 1:34 :: Buriedcode :: Replies: 0 :: Views: 378
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how to do 8b/10b enco/deco for clock signals in verilog/vhdl
hi friends...i have 3 clocks i want encode them... how can i encode them...8b/10b , manchester or pulse width ? how to do it in verilog/vhdl??jay...
PLD, SPLD, GAL, CPLD, FPGA Design :: 11 Oct 2004 2:18 :: ljkong :: Replies: 5 :: Views: 948
laptop screen blanks when warm
p when it has been on for a while the screen goes blank opening and closing the lid pressing the standby button brings it back on does anyone know how to fixthis or know of a repair shop in the north manchester area thanks...
Service Manuals, Requests, Repair Tips :: 30 Sep 2004 13:27 :: amjad :: Replies: 6 :: Views: 654
for circuit experts - help plz !! - half bit delay circuit??
how can i create a half bit delay circuit where a random input bit stream is the input and we dont have the clock (clk) !!!...
ASIC Design Methodologies & Tools (Digital) :: 07 Aug 2004 15:21 :: eltonjohn :: Replies: 12 :: Views: 807
hardware design of 3mb/s point-to-point data link..
posted many questions in this board, and have received many useful replys. i thank you. heres my next problem.... :? basically ive designed a simple protocol on cplds for a 3mb/s data link using manchester encoding (1byte preamble, 2 bytes data,...
Professional Hardware and Electronics Design :: 31 Jul 2004 2:26 :: Buriedcode :: Replies: 3 :: Views: 471
cpld, wireless digital audio...
hi, i posted a similar question in the dsp forum, probably the wrong place to post it, no-one replied :oops: well, i have designed a system to convert an audio signal into digita, send this across some sort of wireless link (radio, ir etc..) and th...
PLD, SPLD, GAL, CPLD, FPGA Design :: 14 Jul 2004 18:31 :: Buriedcode :: Replies: 6 :: Views: 708
arinc 1553 in vhdl
hi,i search a 1553 bus controler core in vhdl, or all information whiwch could help to design this core.regards,ze_dib...
PLD, SPLD, GAL, CPLD, FPGA Design :: 23 Jun 2004 10:47 :: ramesh :: Replies: 2 :: Views: 828
how to obtain components in small qty ?
is there anyone who knows which suppliers to support small quantity order for components ? i need some components for my rf mixer design. thank you....
RF, Microwave, Antennas and Optics :: 19 Jun 2004 11:19 :: v4eda :: Replies: 7 :: Views: 438
what is nrz encoding ?
what is nrz encoding ? its said that this encoding can run fast clock up to 2.5gb :)...
Analog Circuit Design :: 12 May 2004 22:00 :: Laplace :: Replies: 6 :: Views: 1587
rf transceivers
hi.im not sure anyone here have used transceivers called addlink112 from rfsolutions (www.rfsolutions.co.uk). im kinda having trouble sending multiple data from 2 transceivers to 1 transceiver. the problem is only 1 transceivers data is received on t...
RF, Microwave, Antennas and Optics :: 27 Apr 2004 8:26 :: pva :: Replies: 3 :: Views: 363
manchester coding and ask
hii am new to matlab... can i have some pointers on how can i simulate some baseband coding methods with ask modulation1. 1 out of 2562. rz coding3. manchester codingcheers...
Electromagnetic Design and Simulation :: 03 Apr 2004 20:06 :: wireless :: Replies: 0 :: Views: 336
1/3-2/3 pulse decoding library for pic ?
hidoes somebody have drag and drop asm library for decoding 1/3-2/3 pulses ?bit 0 is 1/3 x total period logic level 0 and 2/3 x total period 1bit 1 is 2/3 0 and 1/3 1this code can be inverted, no matterthx...
Microcontrollers :: 15 Jan 2004 13:20 :: tgq :: Replies: 3 :: Views: 588
clock recovery on ethernet
a ethernet interface chip, like 8139, 8019... when it receiving data, how does it recover the synchronous clock?is there a pll ?any idea ?...
Professional Hardware and Electronics Design :: 13 Jan 2004 9:00 :: abouras :: Replies: 1 :: Views: 336
trf6900, chipcon cc1000 which one is best?
hi,im designning now a prototype with chipcon cc1000, but i know there is a trf6900 from ti. do you have experience with these components? which of them should you choice? thanks in advance!best regards,ltg...
RF, Microwave, Antennas and Optics :: 20 Nov 2003 10:48 :: nvp :: Replies: 2 :: Views: 943
pic & rf link hamming and manchester coder
i look for make a converter by rs232 to ttl for driving low power 433mhz rtx, but i want implement a hamming code for signal bit autorepair, someone know about it ? and someane have a source for manchester ?tnx...
PC Programming and Interfacing :: 19 Nov 2003 8:35 :: C-Man :: Replies: 1 :: Views: 963
mucs_pcb an open source pcb router!
i came across this project from the university of manchester severals years ago ! i tried to use it as a router for a x,y etching machine. its still going on ! it now has been ported to linuxhere is the link to the project page http://www.cs.man.ac....
Software Links :: 03 Oct 2003 16:32 :: eltonjohn :: Replies: 0 :: Views: 804
manchester decoder for avr needed
dear fellows,anyone knows about a piece of code for avr which does decodingof manchester encoded data? bitrate is around 2 kbps.~flaxa...
Microcontrollers :: 28 Jun 2003 10:57 :: ME :: Replies: 1 :: Views: 1156
mix two data lines?!
helloif you have 2 serial data lines with manchester encoding at 28kbps,how can i mix them and send it by one serial data line at upper speed like as 56kbps ?(at receive end ,i want to seperate it again and have the original 2 data lines)please help ...
Professional Hardware and Electronics Design :: 14 May 2003 16:55 :: 7rots51 :: Replies: 17 :: Views: 596
rf encoder/decoder
hi,i need to replace a holtek ht12d and ht12e with a pic 16f676, do you know source code for this ?thankstotue...
Microcontrollers :: 28 Apr 2003 18:30 :: gorkin :: Replies: 1 :: Views: 901
manchester encoding?
helloi need some info on manchester encode and decode.it is useful that someone describe the benefits of this method for transmitting data and its applications.bye...
Professional Hardware and Electronics Design :: 24 Apr 2003 0:46 :: gorkin :: Replies: 3 :: Views: 448
wireless network
hello guys can anybody help me in building a wireless network i want to connect a couple of micro controllers to my pc via the com port so if anyone got anything(pdf file , links,..) to give please post replythx in advance...
PC Programming and Interfacing :: 28 Mar 2003 15:39 :: Phil woz ere :: Replies: 8 :: Views: 2047
dc offsets in direct conversion receiver
staring receiver project using direct conversion (dcr), is there any good idea to handle dc offsets in dcr? i read several papers, however, not get very clear picture to deal with dc issue, any sample ciruits would be very helpful. for the lna, shoul...
RF, Microwave, Antennas and Optics :: 14 Mar 2003 3:37 :: Gemini1706 :: Replies: 12 :: Views: 1098
know how to simulate communication link?
hi all, i do need help on my project. ive been building an simple rf system but i need some method: 1) to proof that manchester coding is better than nrz. some mathematical model/ simulation might help and clarify more.2) probability test upon t...
RF, Microwave, Antennas and Optics :: 08 Jan 2003 16:37 :: zorro :: Replies: 7 :: Views: 760
help about single chip modem
hi,i need a single chip modem,5v supply,data rate from 1200bps-9600bps,can anybody help me?any info will be good,thank you!...
Professional Hardware and Electronics Design :: 14 Dec 2002 10:37 :: algilsan :: Replies: 6 :: Views: 679
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