Texas Instruments TMS320DM357 用户手册
4.31 Transmit CPPI DMA State Word 1 (TCPPIDMASTATEW1)
4.32 Transmit CPPI DMA State Word 2 (TCPPIDMASTATEW2)
Registers
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The Transmit CPPI DMA State Word 1 (TCPPIDMASTATEW1) is shown in
and described in
.
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
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
and described in
.
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
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
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