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Tcppidmastatew3), Tcppidmastatew4), Descriptions – Texas Instruments TMS320DM357 User Manual

Page 103: Section 4.33, Section 4.34

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4.33 Transmit CPPI DMA State Word 3 (TCPPIDMASTATEW3)

4.34 Transmit CPPI DMA State Word 4 (TCPPIDMASTATEW4)

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Registers

Table 48. Transmit CPPI DMA State Word 2 (TCPPIDMASTATEW2) Field Descriptions (continued)

Bit

Field

Value

Description

0

Reserved

0

Reserved

The Transmit CPPI DMA State Word 3 (TCPPIDMASTATEW3) is shown in

Figure 48

and described in

Table 49

.

Figure 48. Transmit CPPI DMA State Word 3 (TCPPIDMASTATEW3)

31

0

CURR_BUFFER_PTR

R/W-0

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

Table 49. Transmit CPPI DMA State Word 3 (TCPPIDMASTATEW3) Field Descriptions

Bit

Field

Value

Description

31-0

CURR_BUFFER_PTR

0-FFFF FFFFh Current Buffer Pointer

32-bit absolute byte address in buffer from which data is currently being
transmitted

The Transmit CPPI DMA State Word 4 (TCPPIDMASTATEW4) is shown in

Figure 49

and described in

Table 50

.

Figure 49. Transmit CPPI DMA State Word 4 (TCPPIDMASTATEW4)

31

24

23

18

17

16

DESC_MSG

Reserved

CURR_BUFFER_EOP

CURR_BUFFER_SOP

R/W-0

R-0

R/W-0

R/W-0

15

0

CURR_BUFFER_LENGTH

R/W-0

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

Table 50. Transmit CPPI DMA State Word 4 (TCPPIDMASTATEW4) Field Descriptions

Bit

Field

Value

Description

31-24

DESC_MSG

0-FFh

Descriptor Message

Byte which is passed from the SOP Tx Descriptor to the SOP Receive
descriptor. Used to tag packets.

23-18

Reserved

0

Reserved

17

CURR_BUFFER_EOP

0-1

Current Buffer is EOP

Flag indicating whether or not the current buffer that is being transmitted from is
the end of packet buffer

16

CURR_BUFFER_SOP

0-1

Current Buffer is SOP

Flag indicating whether or not the current buffer that is being transmitted from is
the start of packet buffer

SPRUGH3 – November 2008

Universal Serial Bus (USB) Controller

103

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