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AT89C5131-RDTIL Datasheet(PDF) 117 Page - ATMEL Corporation |
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AT89C5131-RDTIL Datasheet(HTML) 117 Page - ATMEL Corporation |
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117 / 176 page  117 AT89C5131 4136B–USB–09/03 Function Interface Unit (FIU) The Function Interface Unit provides the interface between the AT89C5131 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 55. UFI Block Diagram Figure 56. Minimum Intervention from the USB Device Firmware Transfer Control FSM DPR Control USB Side CSREG 0 to 7 Registers Bank DPR Control mP side FIU User DPRAM Up to 48 MHz UC_sysclk C51 Microcontroller Interface Asynchronous Information Transfer Endpoint 0 Endpoint 1 Endpoint 2 Endpoint 3 SIE DPLL Endpoint 4 Endpoint 5 Endpoint 6 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 interrupt C51 IN DATA1 interrupt C51 Endpoint FIFO write |
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