Texas Instruments TMS320C6457 Uživatelský manuál stáhnout pdf (Strana 20)

Num

Subframe

+ CEIL

Size

Block

Size

MAX_Subframe

Size

Subframe

+ CEIL

Size

Block

256 Num

Subframe

256

while

Size

Block

u Size

MAX_Subsystem

{

Size

Block

+ Size

Block

* Size

Subframe

(

Size

Block

u 128

)

}

Size

Last_Subframe

+ Size

Block

(

Size

Block

v 128

)

Num

Subframe

+ Num

Subframe

* 1

Size

Last_Subframe

+ Size

Block

) Size

MAX_Subframe

{

}

1st sub−frame:

Prolog header is transferred by EDMA3, but not used by the TCP:

The TCP EDMA3 I/F unit reads and counts this data but does not

store it into the coprocessor memory.

Actually, the TCP is using the frame header symbols and does not

need any header prolog computation.

Last sub−frame

A full sub−frame including the header and tail prolog is transferred by EDMA3

but the totality is not used by the TCP.

For the useless sub−frame part, the TCP EDMA3 I/F unit reads and counts it

Actually, the TCP is using the frame tail symbol and does not need any

tail prolog computation.

Full frame (frame length >20730)

1st sub−frame

Middle sub−frame

Last

sub−frame

but does not store it into the coprocessor memory.

Shared-Processing (SP) Mode

www.ti.com

Figure 17. Subframe Equations

Figure 18. Frame Process

20 TMS320C6457 Turbo-Decoder Coprocessor 2 SPRUGK1 – March 2009

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