Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos

 940

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

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:



.)



TXPKTRDY has already been set:



Clear TXPKTRDY so that no packet is ready to be sent



.)

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:



.)



TXPKTRDY has already been set:



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

Data IN

Stall PID

PID

USB Bus
Packets

Cleared by Firmware

Set by Firmware

FORCESTALL

STALLSENT

Set by
USB Device

Cleared by Firmware

Interrupt Pending

Data OUT PID

Stall PID

Data OUT

USB Bus
Packets

Cleared by Firmware

Set by Firmware

FORCESTALL

STALLSENT

Set by USB Device

Interrupt Pending