AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 1198

• Manufacturer Part Number: AT91SAM9G45-EKES
• Description: KIT EVAL FOR AT91SAM9G45
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM9G45-EKES

• Contents: Board
• Processor To Be Evaluated: SAM9G45
• Data Bus Width: 32 bit
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 50 C
• Minimum Operating Temperature: - 10 C
• Operating Supply Voltage: 1.8 V to 3.3 V
• For Use With/related Products: AT91SAM9G45
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4626953

49.2.7
49.2.7.1
1198
AT91SAM9G45
USB High Speed Host Port (UHPHS) and Device Port (UDPHS)
USB does not start after power-up
The USB may not start properly at first use after power-up.
If the device boots out of the internal ROM, SAM-BA will not be functional.
Warning: When booting out of the internal ROM, this workaround is not implemented and there-
fore SAMBA will not be functional.
Below is a possible implementation of the workaround:
/* First enable the UTMI PLL */
AT91C_BASE_PMC->CKGR_UCKR |= (AT91C_CKGR_UCKR_PLLCOUNT & (0x3 << 20)) |
AT91C_CKGR_UCKR_UPLLEN;
tmp =0;
while (((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_SR_LOCKU) == 0) && (tmp++ <
DELAY));
/* Disable the PLLUTMI and wait 10μs min*/
AT91C_BASE_PMC->CKGR_UCKR &= ~AT91C_CKGR_UCKR_UPLLEN;
tmp = 0;
while(tmp++ < DELAY2); // DELAY2 must be defined to fit the 10μs min;
1. Apply a hardware reset (NRST) after power-up.
2. Activate the PLLUTMI twice, following the procedure below:
Problem/Fix Workaround
– a- Start The UTMI PLL an wait for the PLL lock bit
– b- Disable the UTMI PLL and wait 10 μseconds minimum
– c- Restart the UTMIPLL and wait for the PLL Lock bit
6438F–ATARM–21-Jun-10