Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

Product codes

ATSAM4S-WPIR-RD

1015

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

40.6.2.5 Transmit Data Cancellation

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

Endpoints Without Dual-Banks

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

Endpoints With Dual-Banks

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