Phytec phyCORE-i.MX27, Hardware Manual

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System Memory
©
PHYTEC Messtechnik GmbH 2011 L-710e_5
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7.4.1 8/16-Bit NAND Flash Usage (JN1,JN2,RN31,RN32)
The i.MX27 is capable of using 8-Bit and 16-Bit NAND Flash devices. To select between 8- and 16-bit
NAND Flash, the jumpers/resistor networks must be populated as follows:
Table 11: JN1/2,RN31/32 NAND Flash bit width selection
1
N
AND
-F
LASH
B
IT WIDTH
JN1/2 RN31/32
8-bit 2-3/5-6/8-9/11-12 not populated
16-bit 1-2/4-5/7-8/10-11 populated
7.5 I²C EEPROM (U12)
The phyCORE-i.MX27 is populated with a ST 24W32C
2
non-volatile 32 KByte EEPROM (U12) with
an I²C interface to store configuration data or other general purpose data. This device is accessed
through I²C port 2 on the i.MX27. The serial clock signal and serial data signal for I²C port 2 are made
available at the phyCORE-connector as x_I2C2_SDA on X1 pin 84C and x_I2C2_SCL on X1 pin 83C.
Three solder jumpers are provided to set the lower address bits: J13, J15, and J16.
Refer to section
7.5.1 for details on setting these jumpers.
Write protection to the device is accomplished via jumper J1. By default this jumper is closed, allowing
write access to the EEPROM. Removing this jumper will cause the EEPROM to enter write protect
mode, thereby disabling write access to the device.
Refer to section 7.5.2 for further details on setting
this jumper.
1
Default settings are in bold blue text
2
: See the manufacturer’s data sheet for interfacing and operation.