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RM0319 데이터시트(PDF) 145 Page - STMicroelectronics

부품명 RM0319
상세설명  SPEAr320S architecture and functionality
PDF  368 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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RM0319 데이터시트(HTML) 145 Page - STMicroelectronics

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RM0319
Fast Ethernet port (MII0)
Doc ID 022640 Rev 3
145/368
Figure 45.
DMA descriptor list: ring structure (left) and chain structure (right).
Note:
The descriptor addresses must be aligned to the bus-width used (32/64/128 bit buses).
Transmit descriptors
As shown in Figure 46, there are four different transmit descriptors:
●
Transmit Descriptor 0, TDES0 (Table 44): it contains the status of the transmitted frame
and the descriptor ownership information along with control bits for controlling the
descriptor structure and the frame being transferred.
●
Transmit Descriptor 1, TDES1 (Table 45): it contains the data buffer sizes.
●
Transmit Descriptor 2, TDES2 (Table 46): it contains the address pointer to the first
data buffer in the descriptor.
●
Transmit Descriptor 3, TDES3 (Table 47): it contains the address pointer to the second
data buffer in the descriptor or the next descriptor (in case of chained structure).
Buffer 1
Descriptor 0
Descriptor 1
Descriptor 2
Descriptor n
Buffer 2
Buffer 1
Buffer 1
Buffer 1
Buffer 2
Buffer 2
Buffer 2
Buffer 1
Buffer 1
Buffer 1
Descriptor 0
Descriptor 1
Descriptor 2
Next Descriptor



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