MPC8280 datasheet(850/1386 Pages) FREESCALE

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Universal Serial Bus Controller

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

27-34

Freescale Semiconductor

27.9 USB Function Controller Initialization Example

The following is an example initialization sequence for the USB controller operating in function mode. It

can be used to set up two function endpoints to fill transmit FIFOs so that data is ready for transmission

when an IN token is received from the USB. The tokens can be generated using a USB traffic generator.

1. Program CMXSCR to provide a 48 MHz clock to the USB controller.

2. Program the Port Registers to select USBRXD, USBRXP, USBRXN, USBTXP, USBTXN, and

USBOE.

3. Clear FRAME_N.

4. Write (DPRAM+0x500) to EP1PTR, and (DPRAM+0x520) to EP2PTR to set up the endpoint

pointers.

5. Write 0xBC80_0004 to DPRAM+0x20 to set up the TxBD[Status and Control, Data Length] fields

of endpoint 1.

6. Write DPRAM+0x200 to DPRAM+0x24 to set up the TxBD[Buffer Pointer] field of endpoint 1.

7. Write 0xBCC0_0004 to DPRAM+0x28 to set up the TxBD[Status and Control, Data Length] fields

of endpoint 2.

8. Write DPRAM+0x210 to DPRAM+0x2C to set up the TxBD[Buffer Pointer] field of endpoint 2.

9. Write 0xCAFE_CAFE to DPRAM+0x200 to set up the endpoint 1 Tx data pattern.

10. Write 0xFACE_FACE to DPRAM+0x210 to set up the endpoint 2 Tx data pattern.

11. Write 0x0000_0020 to DPRAM+0x500 to set up the RBASE and TBASE fields of the endpoint 1

parameter RAM.

12. Write 0x1818_0100 to DPRAM+0x504 to set up the RFCR, TFCR, and MRBLR fields of the

endpoint 1 parameter RAM.

13. Write 0x0000_0020 to DPRAM+0x508 to set up the RBPTR and TBPTR fields of the endpoint 1

parameter RAM.

14. Clear the TSTATE field of the endpoint 1 parameter RAM.

15. Write 0x0008_0028 to DPRAM+0x520 to set up the RBASE and TBASE fields of the endpoint 2

parameter RAM.

16. Write 0x1818_0100 to DPRAM+0x524 to set up the RFCR, TFCR, and MRBLR fields of the

endpoint 2 parameter RAM.

17. Write 0x0008_0028 to DPRAM+0x528 to set up the RBPTR and TBPTR fields of the endpoint 2

parameter RAM.

18. Clear the TSTATE field of the endpoint 2 parameter RAM.

19. Write 0x0000 to USEP1: Endpoint Number 0, control transfer, one packet only, and normal

handshake.

20. Write 0x7200 to USEP2: Endpoint Number 7, bulk transfer, one packet only, and normal

handshake.

21. Write 0x00 to the USMOD for full-speed 12 Mbps function endpoint mode and disable the USB.

22. Write 0x05 to the USAD for slave address 5.

23. Set USMOD[EN] to enable the USB controller.

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