In Transfer Operation Flow - Samsung S3C2416 User Manual

S3C2416X RISC MICROPROCESSOR
8.26.2 B. IN Transfer Operation Flow
AHB Master Registers( Unit Counter, Total Transfer Counter, Control)
are set in intial state or Interrupt service routine.
AHB Master Registers are to be set after MCU writes one packet data
to USB IN FIFO to operate a AHB Master operation after interrupt
service mode
USB Core receives IN TOKEN from Host PC and sends IN data to
HOST PC. If Host receives IN data successfully (Host send ACK
handshake), Master writes data to IN FIFO.
Master Controller writes to IN FIFO in USB Core from Memory.
NO
Total Transfer Counter in USB core is Zero?
AHB Master Operation is ended and Interrupt mode is On.
Figure 17-4. IN Transfer Operation Flow
YES
USB2.0 DEVICE
16-33