Texas Instruments TMS320DM357 manual Receive Cppi DMA State Word 2 RCPPIDMASTATEW2

Models: TMS320DM357

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4.39 Receive CPPI DMA State Word 2 (RCPPIDMASTATEW2)

The Receive CPPI DMA State Word 2 (RCPPIDMASTATEW2) is shown in Figure 54 and described in Table 55.

Figure 54. Receive CPPI DMA State Word 2 (RCPPIDMASTATEW2)

31

 

 

 

 

16

 

 

SOP_DESCRIPTOR_PTR

 

 

 

 

 

R/W-0

 

 

15

 

 

2

1

0

 

 

SOP_DESCRIPTOR_PTR

Reserved

IN_PACKET

 

 

R/W-0

 

R-0

R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

 

 

 

Table 55. Receive CPPI DMA State Word 2 (RCPPIDMASTATEW2) Field Descriptions

Bit

Field

Value

Description

 

 

31-2

SOP_DESCRIPTOR_PTR

0-1FFF FFFFh

Start of Packet Buffer Descriptor Pointer

 

 

 

 

 

30-bit pointer to 32-bit aligned descriptor which is the first descriptor for the

 

 

 

current packet

 

 

1

Reserved

0

Reserved

 

 

0

IN_PACKET

 

Flag indicating the DMA is in the middle of processing a packet 0: Not currently

 

 

 

in packet

 

 

 

 

0

Not currently in packet

 

 

 

 

1

Currently in packet

 

 

4.40 Receive CPPI DMA State Word 3 (RCPPIDMASTATEW3)

The Receive CPPI DMA State Word 3 (RCPPIDMASTATEW3) is shown in Figure 55 and described in Table 56.

Figure 55. Receive CPPI DMA State Word 3 (RCPPIDMASTATEW3)

31

 

 

 

 

16

 

 

CURR_DESCRIPTOR_PTR

 

 

 

 

 

R/W-0

 

 

15

 

 

 

1

0

 

 

CURR_DESCRIPTOR_PTR

Reserved

 

 

 

R/W-0

R-0

 

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

 

 

 

Table 56. Receive CPPI DMA State Word 3 (RCPPIDMASTATEW3) Field Descriptions

 

Bit

Field

Value

Description

 

 

31-2

CURR_DESCRIPTOR_PTR

0-3FFF FFFFh

Current Buffer Descriptor Pointer

 

 

 

 

 

30-bit pointer to 32-bit aligned descriptor for buffer into which data is currently

 

 

 

being received

 

 

1-0

Reserved

0

Reserved

 

 

SPRUGH3–November 2008

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Texas Instruments TMS320DM357 Receive Cppi DMA State Word 2 RCPPIDMASTATEW2, Receive Cppi DMA State Word 3 RCPPIDMASTATEW3