Filter
Top Products
MAP
decoder
unit
A for MAP 1
and A’ for MAP2
B for MAP1
and B’ for MAP2
(only rate 1/4)
X for MAP1
or X’ for MAP2
EXT
1
: extrinsics after MAP1
EXT
2
: extrinsics after MAP2
EXT
1,2
www.ti.com
Shared-Processing(SP)Mode
Figure16.Shared-Processing(SP)ModeBlockDiagram
Theshared-processingmodeallowstheDSP/TCP2systemtosupportframesstrictlylargerthan20730.
TheDSPbreaksthelargeframeinto2ormoresmallerframesof20480orless.Eachframeiscalleda
subframe.Thesizeofallthesubframes(exceptthelastsubframe)mustbedivisibleby256.TheDSP
breaksthelargeframeintoseveralsub-framesfollowingtheprocessshownbelow.Thefirstsubframe
doesnothaveaheadersectionanditstailsectionisequaltotheprologsize.Themiddlesubframe
headerandtailsectionsizesareeachequaltotheprologsize.Thelastsubframeheadersizeisequalto
theprologsizeandthetailsectionisequaltothetailsize.Theprologsizemustbeintegerdivisibleby8.
Thesub-framesreliabilityportionsaresequencedinordertocreatethefullframe.
1.Thefirstsubframe(required)willhaveaopmodeof1.Themiddlesubframe(s)(optional)havea
opmodeof2.Thelastsubframe(required)willhaveaopmodeof3.
2.Thesizeofallthesubframes(exceptthelastsubframe)mustbeintegerdivisibleby256andMaxsub
framesize=20480=80*256.
3.Thefirstandmiddlesubframesshouldhavethesamesize.Thelastsubframeshouldbeapproximately
thesamesizeastheothersubframes.
4.Thelastsubframesizemustbeatleast129.
SPRUGK1–March2009TMS320C6457Turbo-DecoderCoprocessor219
SubmitDocumentationFeedback