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MPC8280 데이터시트(PDF) 806 Page - Freescale Semiconductor, Inc

부품명 MPC8280
상세설명  PowerQUICC??II Family Reference Manual
PDF  1386 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC8280 데이터시트(HTML) 806 Page - Freescale Semiconductor, Inc

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SCC Ethernet Mode
MPC8280 PowerQUICC II Family Reference Manual, Rev. 1
25-18
Freescale Semiconductor
Figure 25-7 shows an example of how RxBDs are used in receiving.
Figure 25-7. Ethernet Receiving using RxBDs
25.19 SCC Ethernet Transmit Buffer Descriptor
Data is sent to the Ethernet controller for transmission on an SCC channel by arranging it in buffers
referenced by the channel TxBD table. The Ethernet controller uses TxBDs to confirm transmission or
Buffer
0
0x0040
32-Bit Buffer Pointer
1
EF
Receive BD 0
Status
Length
Pointer
0
0x0045
32-Bit Buffer Pointer
0
EF
Receive BD 1
Status
Length
Pointer
1
XXXX
32-Bit Buffer Pointer
E
Receive BD 2
Status
Length
Pointer
1
XXXX
32-Bit Buffer Pointer
E
Receive BD 3
Status
Length
Pointer
Destination Address (6)
Source Address (6)
Type/Length (2)
Buffer
CRC Bytes (4)
Tag Byte (1)
Buffer
Buffer
Old Data from
Empty
64 Bytes
64 Bytes
64 Bytes
64 Bytes
Two Frames
Received in Ethernet
Collision
Line Idle
Present
Time
Time
Buffer Full
Buffer Closed
after CRC Received.
Buffer
Still Empty
Empty
MRBLR = 64 Bytes for this SCC
Empty
Data Bytes (50)
Optional Tag Byte
Collision
Causes Buffer
to be Reused
0
L
1
L
Frame 2
Collided Frame Will
be Overwritten
Appended
Non-Collided Ethernet Frame 1



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