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Board Description
4.2.2
Clock Circuitry
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.
Table 4-1. Main Components Associated with the Clock Systems
4.2.3
Quantity
1
1
1
1
1
1
Reset Circuitry
Description
Crystal for Internal Clock, 12 MHz
Crystal for RTC Clock, 32.768 kHz
Oscillator for Ethernet Clock RMII, 50 MHz
Crystal for Ethernet Clock MII, 25 MHz (not populated)
Crystal for AC97 Codec Clock, 24.576 MHz
Crystal for TV Encoder Clock, 13 MHz, or
Oscillator for TV Encoder, 13 MHz (not populated)
Component assignment
Y1
Y2
Y4
Y5
Y3
Y7
Y6
The reset sources are:
Power on reset
Push button reset
JTAG reset from an in-circuit emulator interface.
4.2.4
4.2.4.1
4-4
Memory
External Memories
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.
AT91SAM9M10-G45-EK User Guide
6495B–ATARM–21-Apr-10
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