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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT80SND1C-ROTIL 데이터시트(PDF) 83 Page - ATMEL Corporation |
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AT80SND1C-ROTIL 데이터시트(HTML) 83 Page - ATMEL Corporation |
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83 / 210 page  83 AT8xC51SND1C 4109E–8051–06/03 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 59 shows typical USB IN and OUT transactions reporting the split in the hard- ware (UFI) and software (C51) load. Figure 58. UFI Block Diagram Figure 59. USB Typical Transaction Load To/From C51 Core Endpoint Control C51 side Endpoint Control USB side Endpoint 2 Endpoint 1 Endpoint 0 USBCON USBINT USBIEN UEPINT UEPIEN UEPNUM UEPSTAX USBADDR UEPCONX UEPDATX UEPRST UBYCTX UFNUMH UFNUML Asynchronous Information Transfer Control FSM To/From SIE 12 MHz DPLL OUT Transactions: HOST UFI C51 OUT DATA0 (n Bytes) ACK Endpoint FIFO read (n Bytes) OUT DATA1 NACK OUT DATA1 ACK IN Transactions: HOST UFI C51 IN ACK Endpoint FIFO Write IN DATA1 NACK C51 interrupt IN DATA1 C51 interrupt Endpoint FIFO write |
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