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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MPC8280 데이터시트(PDF) 647 Page - Freescale Semiconductor, Inc |
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MPC8280 데이터시트(HTML) 647 Page - Freescale Semiconductor, Inc |
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647 / 1386 page  MPC8280 PowerQUICC II Family Reference Manual, Rev. 1 Freescale Semiconductor 19-1 Chapter 19 SDMA Channels and IDMA Emulation The MPC8280 has two physical serial DMA (SDMA) channels. The CP implements two dedicated virtual SDMA channels for each FCC, MCC, SCC, SMC, SPI, and I2C—one for each transmitter and receiver. An additional four virtual SDMA channels are assigned to the programmable independent DMA (IDMA) channels. Figure 19-1 shows data flow paths. Data from the peripheral controllers can be routed to external RAM using the 60x bus (path 1) or the local bus (path 2). Figure 19-1. SDMA Data Paths On a path 1 access, the SDMA channel must acquire the external system bus. On a path 2 access, the local bus is acquired and the access is not seen on the external system bus. Thus, the local bus transfer occurs at the same time as other operations on the external 60x system bus. External RAM External ROM Internal 60x Bus Core CP SDMA Dual-Port RAM 1 3 FCCs External RAM 2 60x Local 2 MCCs 4 SCCs SPI 2 SMCs I2C |
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