Texas Instruments TMS320DM357 用户手册
4.41 Receive CPPI DMA State Word 4 (RCPPIDMASTATEW4)
4.42 Receive CPPI DMA State Word 5 (RCPPIDMASTATEW5)
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Registers
The Receive CPPI DMA State Word 4 (RCPPIDMASTATEW4) is shown in
and described in
.
Figure 56. Receive CPPI DMA State Word 4 (RCPPIDMASTATEW4)
31
0
CURR_BUFFER_PTR
R/W-0
LEGEND: R/W = Read/Write; -n = value after reset
Table 57. Receive CPPI DMA State Word 4 (RCPPIDMASTATEW4) Field Descriptions
Bit
Field
Value
Description
31-0
CURR_BUFFER_PTR
0-FFFF FFFFh
Current Buffer Pointer
32-bit absolute byte address in buffer into which data is currently being received
The Receive CPPI DMA State Word 5 (RCPPIDMASTATEW5) is shown in
and described in
.
Figure 57. Receive CPPI DMA State Word 5 (RCPPIDMASTATEW5)
31
16
PKT_LENGTH
R/W-0
15
0
CURR_BUFFER_LENGTH
R/W-0
LEGEND: R/W = Read/Write; -n = value after reset
Table 58. Receive CPPI DMA State Word 5 (RCPPIDMASTATEW5) Field Descriptions
Bit
Field
Value
Description
31-16
PKT_LENGTH
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_LENGTH
0-FFFFh
Current Buffer Length
Indicates how many free bytes remain in the current buffer that is being received
into
into
SPRUGH3 – November 2008
Universal Serial Bus (USB) Controller
109