Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet

1161

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

Some endpoints have dual-banks whereas some endpoints have only one bank. The procedure to cancel
transmission data held in these banks is described below.

To see the organization of dual-bank availability refer to 

.

There are two possibilities: In one case, TXPKTRDY field in UDP_CSR has already been set. In the other
instance, TXPKTRDY is not set.



TXPKTRDY is not set:

̶

Reset the endpoint to clear the FIFO (pointers). (See 

.)



TXPKTRDY has already been set:

̶

Clear TXPKTRDY so that no packet is ready to be sent

̶

Reset the endpoint to clear the FIFO (pointers). (See 

.)

There are two possibilities: In one case, TXPKTRDY field in UDP_CSR has already been set. In the other
instance, TXPKTRDY is not set.



TXPKTRDY is not set:

̶

Reset the endpoint to clear the FIFO (pointers). (See 

.)



TXPKTRDY has already been set:

̶

Clear TXPKTRDY and read it back until actually read at 0.

̶

Set TXPKTRDY and read it back until actually read at 1.

̶

Clear TXPKTRDY so that no packet is ready to be sent.

̶

Reset the endpoint to clear the FIFO (pointers). (See 

.)