Texas Instruments TMS320DM357 - Manual (Page 103)

4.33 Transmit CPPI DMA State Word 3 (TCPPIDMASTATEW3)
4.34 Transmit CPPI DMA State Word 4 (TCPPIDMASTATEW4)
www.ti.com 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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