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MPC8280 Datasheet(PDF) 405 Page - Freescale Semiconductor, Inc

Part # MPC8280
Description  PowerQUICC??II Family Reference Manual
PDF  1386 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC8280 Datasheet(HTML) 405 Page - Freescale Semiconductor, Inc

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PCI Bridge
MPC8280 PowerQUICC II Family Reference Manual, Rev. 1
Freescale Semiconductor
9-97
Figure 9-89. DMA Chain of Segment Descriptors
9.13.2.1
Descriptor in Big-Endian Mode
In big endian mode, the descriptor in 60x memory should be programmed such that data appears in
ascending significant-byte order. If segment descriptors are written to memory located in the 60x bus, they
should be treated like they are translated from big endian to little endian mode.
Source address
Local memory or PCI memory
Reserved
Destination address
Reserved
Next descriptor
Reserved
Byte count
Reserved
0x00
0x04
0x08
0x0C
0x10
0x14
0x18
0x1C
Offset
0
31
Source address
Reserved
Destination address
Reserved
Next descriptor
Reserved
Byte count
Reserved
0x00
0x04
0x08
0x0C
0x10
0x14
0x18
0x1C
Offset
0
31
Source address
Reserved
Destination address
Reserved
Next descriptor
Reserved
Byte count
Reserved
0x00
0x04
0x08
0x0C
0x10
0x14
0x18
0x1C
Offset
0
31
Descriptor 0
Descriptor 1
Descriptor N
(last)
EOTD=1
Current descriptor address register
0
31
Next descriptor address register
0
31



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