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| author | Suren A. Chilingaryan <csa@dside.dyndns.org> | 2011-10-31 06:34:26 +0100 |
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| committer | Suren A. Chilingaryan <csa@dside.dyndns.org> | 2011-10-31 06:34:26 +0100 |
| commit | cd35dd6d3f1343b8ec2590cf9bfc9a1bc41c4960 (patch) | |
| tree | eed4e7b17ff4b87466cdb4376c2409d49d07d2f1 /NOTES | |
| parent | 85a5de8ad86120a33e00cbb5d66bcfca0388111f (diff) | |
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Diffstat (limited to 'NOTES')
| -rw-r--r-- | NOTES | 24 |
1 files changed, 24 insertions, 0 deletions
@@ -145,6 +145,30 @@ DMA Access Synchronization user to check their consistency and restart DMA engine.] IRQs are enabled and disabled at each call + +DMA Reads +========= +standard: default reading mode, reads a single full packet +multipacket: reads all available packets +waiting multipacket: reads all available packets, after finishing the + last one waiting if new data arrives +exact read: read exactly specified number of bytes (should be + only supported if it is multiple of packets, otherwise + error should be returned) +ignore packets: autoterminate each buffer, depends on engine + configuration +autogrow: automatic memory allocation, only through streaming + + first | new_pkt | bufer + -------------------------- +standard wait | term | wait +multiple packets wait | check | wait - DMA_READ_FLAG_MULTIPACKET +waiting multipacket wait | wait | wait - DMA_READ_FLAG_WAIT +exact wait | wait/term | wait - limited by size parameter +ignore packets wait | check | check - just autoterminated +autogrow + +Shall we do a special handling in case of overflow? Register Access Synchronization =============================== |