Datasheet

865
SAM9263 [DATASHEET]
Atmel-6249N-ATARM-SAM9263-Datasheet_14-Mar-16
42.5.2.9 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 Table 42-1 “USB Endpoint Description”.
42.5.2.10 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, Section 42.6.9 “UDP Reset Endpoint Register”.)
 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, Section 42.6.9 “UDP Reset Endpoint Register”.)
42.5.2.11 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, Section 42.6.9 “UDP Reset Endpoint Register”.)
 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, Section 42.6.9 “UDP Reset Endpoint Register”.)