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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT43USB325 데이터시트(PDF) 66 Page - ATMEL Corporation |
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AT43USB325 데이터시트(HTML) 66 Page - ATMEL Corporation |
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66 / 109 page  66 3355C–USB–4/05 AT43USB325 8.1.3 Setup Response State The Function Interface Unit (FIU) receives a SETUP token with 8 bytes of data from the Host. The FIU stores the data in the FIFO, sends an ACK back to the host and asserts an RX_SETUP interrupt. Hardware Firmware 1. SETUP token, DATA from Host 2. ACK to Host 3. Store data in FIFO 4. Set RX SETUP → INT 5. Read UISR 6. Read CSR0 7. Read Byte Count 8. Read FIFO 9. Parse command data 10. Write to H/FCAR0: 11. If Control Read: set DIR, clear RX SETUP, fill FIFO, set TX Packet Ready in CAR0 12. If Control Write: clear DIR in CAR0 13. If no Data Stage: set Data End, clear DIR, set Force STALL in CAR0 14. Set UIAR[EP0 INTACK] to clear the interrupt source |
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