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Atari coding BBS
| No Crew Mpeg2 player question |
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Posted by: Laurent Sallafranque
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Oct,26.2009-23:59
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Hello,
Could anybody explain me how NoCrew mpeg2 player transfers datas from DMA read to the SSI ?
I read in their code:
; Read 16 bits from DMA and
; perform special bit-shifting
; to compensate for read skewness.
bset #4,X:<<M_PCD ; Start frame sync. lolo
_wait jclr #7,X:<<M_SR,_wait ; RDF
bclr #4,X:<<M_PCD ; Stop frame sync.
Does this mean that the DMA play waits this frame bit to send a 16 bits data ?
Which parameter in the crossbar allows to synchronize DMA_play from a "ssi" frame bit ?
Any informations would be welcome here to help emulating this player correctly.
Regards
Laurent
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