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USB DEVICE S3C2440A RISC MICROPROCESSOR
13-18
END POINT OUT WRITE COUNT REGISTER (OUT_FIFO_CNT1_REG/OUT_FIFO_CNT2_REG)
These registers maintain the number of bytes in the packet as the number is unloaded by the MCU.
Register Address R/W Description Reset Value
OUT_FIFO_CNT1_REG 0x52000198(L)
0x5200019B(B)
R
(byte)
End Point out write count register1 0x00
OUT_FIFO_CNT1_REG Bit MCU USB Description Initial State
OUT_CNT_LOW [7:0] R W Lower byte of write count 0x00
Register Address R/W Description Reset Value
OUT_FIFO_CNT2_REG 0x5200019C(L)
0x5200019F(B)
R
(byte)
End Point out write count register2 0x00
OUT_FIFO_CNT2_REG Bit MCU USB Description Initial State
OUT_CNT_HIGH [7:0] R W Higher byte of write count. The
OUT_CNT_HIGH may be always 0
normally.
0x00
END POINT FIFO REGISTER (EPN_FIFO_REG)
The EPn_FIFO_REG enables the MCU to access to the EPn FIFO.
Register Address R/W Description Reset Value
EP0_FIFO 0x520001C0(L)
0x520001C3 (B)
R/W
(byte)
End Point0 FIFO register 0xXX
EP1_FIFO 0x520001C4(L)
0x520001C7(B)
R/W
(byte)
End Point1 FIFO register 0xXX
EP2_FIFO 0x520001C8(L)
0x520001CB(B)
R/W
(byte)
End Point2 FIFO register 0xXX
EP3_FIFO 0x520001CC(L)
0x520001CF(B)
R/W
(byte)
End Point3 FIFO register 0xXX
EP4_FIFO 0x520001D0(L)
0x520001D3(B)
R/W
(byte)
End Point4 FIFO register 0xXX
EPn_FIFO Bit MCU USB Description Initial State
FIFO_DATA [7:0] R/W R/W FIFO data value 0xXX