Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK Data Sheet

1129

SAM9X25 [DATASHEET]

11054E–ATARM–10-Mar-2014

Problem Fix/Workaround:

To prevent a SAM-BA execution issue, the USB device must be connected via a USB Full Speed hub to the PC.

At application level, the DLL can be re-initialized in the correct state by toggling the BIASEN bit (high -> low -> high) when 
resuming from the Suspend mode. 

The BIASEN bit is located in the CKGR_UCKR register in PMC user interface.

The function below can be used to generate the pulse on the bias signal.

void generate_pulse_bias(void)

{

unsigned int * pckgr_uckr = (unsigned int *) 0xFFFFFC1C;

* pckgr_uckr &= ~AT91_PMC_BIASEN;

* pckgr_uckr |= AT91_PMC_BIASEN;

}

In the USB device driver, the generate_pulse_bias function must be implemented in the “USB end of reset” and “USB 
end of resume” interrupts.

The TIOA5 enable signal is not well connected internally, it is shared with the TIOB5 enable signal. 

TIOB5 is working normally.

TIOA5 is working normally in Capture Mode.

Waveform Mode is not available for TIOA5 if the TC_CMR.ETRGEDG bit is set to 1, 2 or 3.

Problem Fix/Workaround

None.

During NAND Flash initialization, the ONFI parameters detection may not work correctly.

This can lead to an incorrect configuration of ECC settings, reading wrong data from the NAND Flash memory, and the 
unability to boot from this memory.

Problem Fix/Workaround

When programming the bootable program in the NAND Flash, always use the header method, with any NAND Flash 
memory, ONFI compliant or not.