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Re: STE & Falcon DMA sound
Posted by: Laurent / Thadoss Feb,07.2015-10:40 

Hi,

> Falcon might be different, I don't know if there's a FIFO and what is its size, so seamless playback can be a little more complicated and this would explain why you get "clicks" when turning DMA off/on on falcon (if the FIFO is not as big as on STE).

From what I know, the Falcon has a 2x32 bytes FIFO in the crossbar.
One for DMA play and one for DMA record (I've seen this at least in the falcon030 developer guide, there's a shema which shows these 2 FIFO.

It works nearly like the STE (start/stop DMA, loop) but for both play and record.

There's an extra address :

$FF893C|byte |CODEC-Status BIT 1 0|R/W
| |Left Channel Overflow ----------------------------' ||
| |Right Channel Overflow -----------------------------'|


But I don't know really what it's useful at.

The 2 Falcon FIFO are not implemented into hatari's crossbar emulation code yet.


Laurent







[All messages in this thread]    [Start new thread]

Topic Posted by  Date 
STE & Falcon DMA sound defjam Feb,05.2015-21:31
  Re: STE & Falcon DMA sound dml Feb,06.2015-00:18
    Re: STE & Falcon DMA sound mikro Feb,06.2015-09:22
  Re: STE & Falcon DMA sound Mr.Styckx Feb,06.2015-01:04
    Re: STE & Falcon DMA sound gwEm/PHF Feb,06.2015-11:06
    Re: STE & Falcon DMA sound evil Feb,06.2015-22:36
      Re: STE & Falcon DMA sound Mr.Styckx Feb,07.2015-01:43
        Re: STE & Falcon DMA sound Laurent / Thadoss Feb,07.2015-10:40
          Re: STE & Falcon DMA sound Defjam Feb,07.2015-18:00
        Re: STE & Falcon DMA sound Abstract_f Feb,16.2015-15:56
          Re: STE & Falcon DMA sound ggn Feb,16.2015-16:55
            Re: STE & Falcon DMA sound gwEm/PHF Feb,18.2015-11:09
          Re: STE & Falcon DMA sound PeP Feb,17.2015-16:55
            Re: STE & Falcon DMA sound gwEm/PHF Feb,18.2015-11:05


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