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Discussion Groups | Analog Devices DSPs | Re: Blackfin clocks and UART
Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).
Simple question - sriram K - Nov 18 19:23:00 2003
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Hi all I have very simple question.I have to send 600 words(10 cycles of 1Mhz sine) to a 14bit DAC.For that I have generated 14 bit words.Now my question would be when I send the word from the processor to the DAC will they go along D0-D14... and which order little or Big endian. Thnaks Regards Sriram __________________________________ |
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Re: Simple question - bhaskar_thiagarajan - Nov 18 23:00:00 2003
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--- In , sriram K <sriram2480@y...> wrote: > Hi all > I have very simple question.I have to send 600 > words(10 cycles of 1Mhz sine) to a 14bit DAC.For that > I have generated 14 bit words.Now my question would be > when I send the word from the processor to the DAC > will they go along D0-D14... > and which order little or Big endian. Without knowledge of your board or system, there is no way to answer that question. In fact, you are the best person to answer it - depends on how the digital interface between your processor and your DAC is implemented. Trace that out on your board/design and you'll get your answer. > Thnaks > Regards > Sriram > > __________________________________ |
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Re: Re: Simple question - ayyam perumal - Nov 20 0:08:00 2003
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hi, plzzz tell about what processor u r using.if you are proceeding with parallel interface in any processor the data will come as it is.. that is in d0 -d14 pattern.if it is serial interface then u have to reffer processor data sheet there you can find about the data format(msb first or lsb first).it will differ for processor to processor regards ayyams ------------------------------------------------------- --- bhaskar_thiagarajan <> wrote: > --- In , sriram K > <sriram2480@y...> wrote: > > Hi all > > I have very simple question.I have to send 600 > > words(10 cycles of 1Mhz sine) to a 14bit DAC.For > that > > I have generated 14 bit words.Now my question > would be > > when I send the word from the processor to the DAC > > will they go along D0-D14... > > and which order little or Big endian. > > Without knowledge of your board or system, there is > no way to answer > that question. In fact, you are the best person to > answer it - > depends on how the digital interface between your > processor and your > DAC is implemented. Trace that out on your > board/design and you'll > get your answer. > > > Thnaks > > Regards > > Sriram > > > > __________________________________ > > > _____________________________________ > /groups.php3 ________________________________________________________________________ Yahoo! India Mobile: Download the latest polyphonic ringtones. Go to http://in.mobile.yahoo.com |
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Simple question - sriram K - Dec 3 16:38:00 2003
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Hi all I have a very simple question.Do the serial port interrupts operate with the SCLK or with the core clock because the application requires core to operate only after establishing the serial communication. Thanks in advance Sriram __________________________________ |
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Re: Blackfin clocks and UART - Kenneth Porter - Dec 4 4:55:00 2003
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--On Wednesday, December 03, 2003 8:38 AM -0800 sriram K <> wrote: > I have a very simple question.Do the serial port > interrupts operate with the SCLK or with the core > clock because the application requires core to operate > only after establishing the serial communication. I'm guessing you mean Blackfin, so I changed the subject line. AFAIK the UART is clocked by SCLK (system clock, used for peripherals). If you power everything down except the core, the UART should freeze until you power it back up again. But double-check the chip manual on the power-down modes. |
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Re: Blackfin clocks and UART - M B - Dec 4 14:58:00 2003
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I don't have an answer to Sriram's question. But to add, in Sleep Mode, SCLK is on and CCLK is off... so Ideally, if you were working with peripherals (as they are all clocked by SCLK) and external memory (sleep mode will allow DMA accesses to external memory), you can do your work even as the core is powered down. Regards MB --- Kenneth Porter <> wrote: > --On Wednesday, December 03, 2003 8:38 AM -0800 > sriram K > <> wrote: > > > I have a very simple question.Do the serial port > > interrupts operate with the SCLK or with the core > > clock because the application requires core to > operate > > only after establishing the serial communication. > > I'm guessing you mean Blackfin, so I changed the > subject line. AFAIK the UART > is clocked by SCLK (system clock, used for > peripherals). If you power > everything down except the core, the UART should > freeze until you power it > back up again. But double-check the chip manual on > the power-down modes. > > _____________________________________ > /groups.php3 ________________________________________________________________________ Yahoo! India Mobile: Download the latest polyphonic ringtones. Go to http://in.mobile.yahoo.com |
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