Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Data Sheet

6495B–ATARM–21-Apr-10

The SAM9M10-G45-EK includes six clock sources:

„

Two are alternatives for the SAM9M10 main clock,

„

One crystal and one crystal oscillator are used for the Ethernet MII/RMII chip,

„

One crystal is used for the AC97 codec chip,

„

One crystal or one crystal oscillator is used for the TV encoder.

 

The reset sources are:

„

Power on reset

„

Push button reset

„

JTAG reset from an in-circuit emulator interface.

The SAM9M10 features a DDR2/LPDDR memory interface and an External Bus Interface (EBI) to permit 
interfacing to a wide range of external memories and to almost any kind of parallel peripheral. 

The SAM9M10-G45-EK board is equipped with DDR2/LPDDR devices featuring 128 MB of DDR2- 
SDRAM memory (16Meg*8*4). 

The External Bus Interface (EBI) is connected to three kinds of memory devices:

„

One Parallel Flash (not populated by default)

„

Two DDR2-SDRAM

„

One NAND Flash (2Gb, 8 bit bus)

The chip selects NCS0, NCS1 and NCS3 are used for NOR Flash, DDR2-SDRAM and NAND Flash 
memories, respectively. Furthermore, a dedicated jumper can disconnect each of the two NCS0 and 
NCS3 signals, making them available for other functions.

Table 4-1.  Main Components Associated with the Clock Systems

1

Crystal for Internal Clock, 12 MHz

Y1

1

Crystal for RTC Clock, 32.768 kHz

Y2

1

Oscillator for Ethernet Clock RMII, 50 MHz

Y4

1

Crystal for Ethernet Clock MII, 25 MHz (not populated)

Y5

1

Crystal for AC97 Codec Clock, 24.576 MHz

Y3

1

Crystal for TV Encoder Clock, 13 MHz, or

Oscillator for TV Encoder, 13 MHz (not populated)

Y7

Y6