Texas Instruments TMS320DM357 Transmit Cppi DMA State Word 1 TCPPIDMASTATEW1, Sopdescriptorptr

Models: TMS320DM357

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4.31 Transmit CPPI DMA State Word 1 (TCPPIDMASTATEW1)

The Transmit CPPI DMA State Word 1 (TCPPIDMASTATEW1) is shown in Figure 46 and described in Table 47.

Figure 46. Transmit CPPI DMA State Word 1 (TCPPIDMASTATEW1)

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 47. Transmit CPPI DMA State Word 1 (TCPPIDMASTATEW1) Field Descriptions

Bit

Field

Value

Description

 

 

31-2

SOP_DESCRIPTOR_PTR

0-3FFF 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

 

 

 

 

1

Currently in packet

 

 

4.32 Transmit CPPI DMA State Word 2 (TCPPIDMASTATEW2)

The Transmit CPPI DMA State Word 2 (TCPPIDMASTATEW2) is shown in Figure 47 and described in Table 48.

Figure 47. Transmit CPPI DMA State Word 2 (TCPPIDMASTATEW2)

31

 

 

 

16

 

 

CURR_DESCRIPTOR_PTR

 

 

 

 

R/W-0

 

15

 

2

1

0

 

CURR_DESCRIPTOR_PTR

TRUNCATED_NON_EOP

Reserved

 

R/W-0

 

R/W-0

R-0

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

 

 

Table 48. Transmit CPPI DMA State Word 2 (TCPPIDMASTATEW2) 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 from which data is currently

 

 

 

being transmitted

 

1

TRUNCATED_NON_EOP

 

Flag indicating that packet truncation has occurred on the current packet within a

 

 

 

buffer which was not designated as the end of packet buff

 

 

 

0

Truncation within non end of packet buffer has not occurred

 

 

 

1

Truncation within non end of packet has occurred

 

102

Universal Serial Bus (USB) Controller

SPRUGH3–November 2008

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Texas Instruments TMS320DM357 manual Transmit Cppi DMA State Word 1 TCPPIDMASTATEW1, Sopdescriptorptr, Currdescriptorptr