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CT60 and related things BBS
| Re: FastRam -> DSP transfer |
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Posted by: jason
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Feb,23.2008-03:24
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I've achieved 5.2 mb/s using FastRam->DSP host port on a centurboIIb machine (CPU @50mhz and has bus speeder @ 25mhz i believe). SDMA will transfer around 1 mb/s. You could use both methods simultaneously i suppose but oh what a headache that'd be.
When I xfer I only use handshake for the 1st word in my block. I follow this with unrolled code to move (An)+,DSP_HOST_WORD. Even though centurbo is clocked at 50mhz, the DSP seems to have no trouble keeping up (using "fast" exception handling). Block size makes little difference so I size my blocks to coincide with one "tick" at 96PPQ. Meaning I have 96 blocks per quarter note at whichever BPM i'm running (this is used for musical sample sequencing). I'm able to get about 16 stereo channels at 44.1 khz using this technique along with realtime windowing and stereo 4-pole filters performed by the DSP at the same time. Beat dat!
-j
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