Texas Instruments TMS320DM357 用户手册
4.39 Receive CPPI DMA State Word 2 (RCPPIDMASTATEW2)
4.40 Receive CPPI DMA State Word 3 (RCPPIDMASTATEW3)
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Registers
The Receive CPPI DMA State Word 2 (RCPPIDMASTATEW2) is shown in
and described in
.
Figure 54. Receive CPPI DMA State Word 2 (RCPPIDMASTATEW2)
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 55. Receive CPPI DMA State Word 2 (RCPPIDMASTATEW2) Field Descriptions
Bit
Field
Value
Description
31-2
SOP_DESCRIPTOR_PTR
0-1FFF 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
in packet
0
Not currently in packet
1
Currently in packet
The Receive CPPI DMA State Word 3 (RCPPIDMASTATEW3) is shown in
and described in
.
Figure 55. Receive CPPI DMA State Word 3 (RCPPIDMASTATEW3)
31
16
CURR_DESCRIPTOR_PTR
R/W-0
15
1
0
CURR_DESCRIPTOR_PTR
Reserved
R/W-0
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 56. Receive CPPI DMA State Word 3 (RCPPIDMASTATEW3) 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 into which data is currently
being received
being received
1-0
Reserved
0
Reserved
SPRUGH3 – November 2008
Universal Serial Bus (USB) Controller
107