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MPC8280 데이터시트(PDF) 405 Page - Freescale Semiconductor, Inc |
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MPC8280 데이터시트(HTML) 405 Page - Freescale Semiconductor, Inc |
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405 / 1386 page ![]() 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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