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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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MFC2000 数据表(PDF) 112 Page - List of Unclassifed Manufacturers |
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MFC2000 数据表(HTML) 112 Page - List of Unclassifed Manufacturers |
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112 / 426 page  MFC2000 Multifunctional Peripheral Controller 2000 Hardware Description 4-82 Conexant 100723A 4.7.4 USB Block Diagrams Below is a block diagram depicting the four USB logical channels. Each logical channel shows the double buffering of the address and block registers. The right side of the diagram shows the common counters for the block and address. Also shown is the feedback path from the counters to the registers used upon USB ACKs. The select signal for the logical channels are shown at the bottom of the diagram. Address 1 Address 2 Block 1 Block 2 LCH1 Address 1 Address 2 Block 1 Block 2 LCH2 Address 1 Address 2 Block 1 Block 2 LCH3 Address 1 Address 2 Block 1 Block 2 LCH4 Addr Counter Block Counter IPB Data Channel Select Note: Selecting Channel Will Load current registers to counter Address Feedback Block Feedback Adr_Out Blk_Out To IPB Data Out Figure 4-34. USB Logical Channels Block Diagram 4.7.4.1 USB Logical Channel Assignments • Ch1: Scan Mem to PC, DMA Read only • Ch2: Print PC to Mem, DMA Write only • Ch3: FAX Rx Mem to PC, DMA Read only • Ch4: FAX Tx PC to Mem, DMA Write only |
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