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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8280 датащи(PDF) 115 Page - Freescale Semiconductor, Inc |
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MPC8280 датащи(HTML) 115 Page - Freescale Semiconductor, Inc |
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115 / 1386 page  Overview MPC8280 PowerQUICC II Family Reference Manual, Rev. 1 Freescale Semiconductor 1-21 This system supports PCI and implements a 155-Mbps, full-duplex ATM with more than 128 active connections. The MPC8280 cannot support both functions simultaneously. The local bus is needed to store ATM connection tables. Therefore, an external PCI bridge is necessary. In systems with fewer than 128 active connections or where the ATM average bit rate is lower that 155 Mbps, the local bus may not be necessary to store connection tables, and it may be possible to use it as PCI bus. 1.7.2.6 The MPC8280 as PCI Agent Figure 1-14 shows the configuration when the MPC8280 acts as the PCI agent. Figure 1-14. MPC8280 as PCI Agent In this system, the MPC8280 is a PCI agent on an I/O card and the PCI host resides on the PCI bus. An external PCI bridge is used to connect the host to the PCI bus. The internal PCI bridge in the MPC8280 is used to bridge between the PCI bus and the 60x bus on the MPC8280. PCI Bus 60x Bus SDRAM/SRAM/DRAM ATM Connection Tables and/or MPC8280 Communication Channels UTOPIA PHY ATM PHY PCI Bridge System Bus Host Processor Agent Host Memory Communication Data |
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