Board Description
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, and
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
Crystal for AC91 Codec Clock, 24.576 MHz
Crystal for TV Encoder Clock, 13 MHz, or
Oscillator for TV Encoder, 13 MHz
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-EKES board is equipped with DDR2/LPDDR devices featuring 128 MB of DDR2-
SDRAM memory (Micron MT47H64M8B6-3 16Meg*8*4).
The External Bus Interface (EBI) is connected to three kinds of memory devices:
One Parallel Flash AT49SV322DT (not populated by default)
Two DDR2-SDRAM MT47H64M8B6-3
One NAND Flash MT29F2G16ABD (not populated by default) or MT29F2G08ABD (single footprint)
The chip select NCS0, NCS1 and CS3 are used for NOR Flash, DDR2-SDRAM and NAND Flash mem-
ories, respectively. Furthermore, a dedicated jumper can disconnect each of these NCS0, NCS1, and
NCS3 signals, making them available for other functions.
AT91SAM9M10-EKES User Guide
11029A–ATARM–11-Jan-10
相关PDF资料
AT91SAM9M10-G45-EK KIT EVAL FOR AT91SAMG45/9M10
AT91SAM9RL-EK KIT EVAL FOR AT91SAM9RL
AT91SAM9X35-EK KIT EVAL FOR AT91SAM9X35
AT91SAM9XE-EK KIT EVAL FOR AT91SAM9XE
AT93C46D-TH-T IC EEPROM 1KBIT 2MHZ 8TSSOP
AT93C46E-TH-T IC EEPROM 1KBIT 2MHZ 8TSSOP
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