Texas Instruments TMS320DM357 User Manual
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
and described in
.
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
transmitted
The Transmit CPPI DMA State Word 4 (TCPPIDMASTATEW4) is shown in
and described in
.
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.
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
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
the start of packet buffer
SPRUGH3 – November 2008
Universal Serial Bus (USB) Controller
103