eeprom problems

Hi, is there any documents instruct how to read data from eeprom, like
93c46?
I have 93c46's datasheet and source code from linux rtl8139 driver,
but I still can not understand the detail.

On Sat, 20 Dec 2008 06:17:38 -0800, leilei wrote:

> Hi, is there any documents instruct how to read data from eeprom, like
> 93c46?
> I have 93c46's datasheet and source code from linux rtl8139 driver, but
> I still can not understand the detail.

If it's a serial (I2C or SPI) EEPROM then in general you may have to go  
through serial hardware.  I would expect that in a PC you'd have to go 
through serial hardware that's designed to make life easy when you have 
to work with a bazzilion different devices, which means the driver is 
going to be byzantine.

So find out how your hardware is put together, and maybe even look for a 
"circuit cellar" type of article on the web (or on paper) where someone's 
done this with much simpler hardware.

-- 
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html

leilei wrote:
> Hi, is there any documents instruct how to read data from eeprom, like
> 93c46?
> I have 93c46's datasheet and source code from linux rtl8139 driver,
> but I still can not understand the detail.

93c46 is "three-wire serial", meaning SPI.  There is an SPI controller
embedded in the rtl8139 chip, and the rtl8139 driver is going to be
specific to that particular SPI controller.

	-hpa