Universal Serial Bus Controller User's Guide

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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