Texas Instruments TMS320DM357 用户手册
4.43 Receive CPPI DMA State Word 6 (RCPPIDMASTATEW6)
4.44 Receive CPPI Completion Pointer (RCPPICOMPPTR)
Registers
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The Receive CPPI DMA State Word 6 (RCPPIDMASTATEW6) is shown in
and described in
.
Figure 58. Receive CPPI DMA State Word 6 (RCPPIDMASTATEW6)
31
16
SOP_BUFFER_BYTECNT
R/W-0
15
0
CURR_BUFFER_BYTECNT
R/W-0
LEGEND: R/W = Read/Write; -n = value after reset
Table 59. Receive CPPI DMA State Word 6 (RCPPIDMASTATEW6) Field Descriptions
Bit
Field
Value
Description
31-16
SOP_BUFFER_BYTECNT
0-FFFFh
Packet Length
Indicates how many bytes are contained in the packet. This value is written into
bits 15:0 of Word 3 of the SOP Descriptor during end of packet processing.
bits 15:0 of Word 3 of the SOP Descriptor during end of packet processing.
15-0
CURR_BUFFER_BYTECNT
0-FFFFh
Current Buffer Length
Indicates how many free bytes remain in the current buffer that is being received
into
into
The Receive CPPI Completion Pointer (RCPPICOMPPTR) is shown in
and described in
.
Figure 59. Receive CPPI Completion Pointer (RCPPICOMPPTR)
31
16
DESC_ADDR
R/W-0
15
2
1
0
DESC_ADDR
Reserved
RDBK_MODE
R/W-0
R-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 60. Receive CPPI Completion Pointer (RCPPICOMPPTR) Field Descriptions
Bit
Field
Value
Description
31-2
DESC_ADDR
0-7FFF FFFFh
Descriptor Address
This field contains the 30-bit word aligned pointer of the end of packet descriptor that the
DMA has last processed.
DMA has last processed.
1
Reserved
0
Reserved
110
Universal Serial Bus (USB) Controller
SPRUGH3 – November 2008