Texas Instruments TMS320DM357 - Manual (Page 102)

4.31 Transmit CPPI DMA State Word 1 (TCPPIDMASTATEW1)
4.32 Transmit CPPI DMA State Word 2 (TCPPIDMASTATEW2)
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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
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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