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I think it depends a lot on how fast your interrupt service routine winds
up being. If you have total control over bit times and inter-character-gaps on the sending device, you could make it as fast or as slow as your DSP chip can handle. I doubt if the "line speed" of the SPI peripherals will be the limit. The 56803 went to something like 1-5 MHz, if you could keep up. The gap between characters has to be long enough for you to capture the data. Your ISR has to be faster than one character-time. I don't know your chip, or your ISR-dispatcher, but interrupt response time might be in the .5 to 3 microsecond range, and your ISR might be in the .5 to 33 microsecond range. That might mean anywhere between 1-33 usec per character (30-1000 Kwords per second?) However, you won't know until you can time your ISR. I tried to do too much in a SPIbus ISR once, and regretted it. Rick Corey -----Original Message----- From: gunala_sunitha [mailto:] Sent: Thursday, December 30, 2004 1:24 PM To: Subject: [motoroladsp] how to calculate the maximum rate for serial ports of dsp56002/56303 hi-need a small help regarding the calculation of maximum rate that a dsp 56002/56303 can read through the ssiport of dsp56002.and essi of dsp56303. as i want to interface the A/D chip to these devices. |
RE: how to calculate the maximum rate for serial po rts of dsp56002/56303
Started by ●December 30, 2004
