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AT83SND1CXXX-ROTUL 데이터시트(PDF) 82 Page - ATMEL Corporation |
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AT83SND1CXXX-ROTUL 데이터시트(HTML) 82 Page - ATMEL Corporation |
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82 / 212 page ![]() 82 4109J–8051–10/06 AT8xC51SND1C • Bit stuffing and unstuffing. • CRC generation and checking. • ACKs and NACKs automatic generation. • TOKEN type identifying. • Address checking. • Clock recovery (using DPLL). Figure 14-4. SIE Block Diagram 14.1.3 Function Interface Unit (UFI) The Function Interface Unit provides the interface between the AT8xC51SND1C and the SIE. It manages transactions at the packet level with minimal intervention from the device firmware, which reads and writes the endpoint FIFOs. Figure 14-6 shows typical USB IN and OUT transactions reporting the split in the hardware (UFI) and software (C51) load. 8 Start of Packet Detector Clock Recover SYNC Detector PID Decoder Address Decoder Serial to Parallel Converter CRC5 & CRC16 Generator/Check USB Pattern Generator Parallel to Serial Converter Bit Stuffing NRZI Converter CRC16 Generator NRZI ‘ NRZ Bit Unstuffing Packet Bit Counter End of Packet Detector USB CLOCK 48 MHz SysClk Data In D+ D- (12 MHz) 8 Data Out |
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