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Note that several user channels can be programmed prior to starting the TCP2.
Direction
Transmit (DSP
TCP)
Receive (TCP
DSP)
Transmit
Transmit
Transmit
Receive
Receive
Direction
Transmit (DSP
TCP)
Receive (TCP
DSP)
Transmit
Transmit
Transmit
Receive
9.1
EDMA3 Resources
9.1.1
TCP2 Dedicated EDMA3 Resources
Within the available 64 EDMA3 channels event sources, two are assigned to the TCP: event 30 and event
31.
Event 30 is associated to the TCP2 receive event (TCPREVT) and is used as the synchronization
event for the EDMA3 transfer from the TCP2 to the DSP (receive).
Event 31 is associated to the TCP2 transmit event (TCPXEVT) and is used as the synchronization
event for the EDMA3 transfer from the DSP to the TCP2 (transmit).
9.1.2
Special TCP2 EDMA3 Programming Considerations
The EDMA3 parameters consists of eight words as shown in
EDMA3 transfers should follow ACNT * BCNT number of bytes in A_Sync Mode and ACNT *BCNT *
CCNT number of bytes in AB_Sync Mode. The number of bytes should be a multiple of 8. For more
information, see the TMS320C6457 DSP Enhanced Direct Memory Access (EDMA3) Controller Reference
Guide (SPRUGK6).
31
Number of arrays of length ACNT (BCNT)
Destination 2nd Dimension Index (DSTBIDX)
BCNTRLD
Destination 3rd Dimension Index (DSTCIDX)
Reserved
SPRUGK1 – March 2009
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Table 42. EDMA3 Parameters in Standalone (SA) Mode
Data
Input configuration
parameters
Systematics and parities
Interleaver indexes
Hard decisions
Output parameters
Table 43. EDMA3 Parameters in Shared Processing (SP) Mode
Data
Input configuration
parameters
Systematics and parities
A prioris
Extrinsics
Figure 99. EDMA3 Parameters Structure
EDMA3 Channel Options Parameter (OPT)
EDMA3 Channel Source Address (SRC)
EDMA3 Channel Destination Address (DST)
Usage
Send the input configuration
parameters
Send the systematics and parities
Send the interleaver table
Read the hard decisions
Read the output parameters
Usage
Send the input configuration
parameters
Send the systematics and parities
Send the a prioris
Read the extrinsics
Figure
99. In the context of the TCP2, all
Number of bytes in array (ACNT)
Source 2nd Dimension Index (SRCBIDX)
Source 3rd Dimension Index (SRCCIDX)
Number of frames in block (CCNT)
TMS320C6457 Turbo-Decoder Coprocessor 2
Programming
Required/Optional
Required
Required
Optional INTER bit
Required
Optional OUTF bit
Required/Optional
Required
Required
Required except for first
iteration MAP1
Required
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