[sigrok-dumps.git] / i2c / gigabyte_6vle-vxl_i2c / README

-------------------------------------------------------------------------------
GIGABYTE 6VLE-VXL I2C data
-------------------------------------------------------------------------------

This is an example capture of I2C traffic on a DDR SDRAM's EEPROM chip, for
Serial Presence Detect (SPD) data. The 512MB DDR RAM module was inserted
in a GIGABYTE 6VLE-VXL mainboard. After the capture was started, the board
was powered-on, thus the captured data corresponds to the BIOS code which
reads the RAM module's EEPROM contents (in order to properly initialize
the RAM).

Additionally, it turned out that on the same I2C bus, there is an additional
I2C device, the ICS950908 "Programmable Timing Control Hub for P4" (a clock
generation chip). The capture also contains the I2C-based configuration of
that chip by the BIOS.

Details:
https://en.wikipedia.org/wiki/Serial_presence_detect
http://pdf1.alldatasheet.com/datasheet-pdf/view/90645/ICST/ICS950908.html


Logic analyzer setup
--------------------

The logic analyzer used was a Saleae Logic (at 2MHz):

  Probe       I2C pin
  -------------------
  1 (black)   SCL
  4 (orange)  SDA


Data
----

The sigrok command line used was:

  sigrok-cli -d 0:samplerate=2mhz --time 10s -o <filename>
Commit	Line	Data
c83a7da3 UH	1	-------------------------------------------------------------------------------
	2	GIGABYTE 6VLE-VXL I2C data
	3	-------------------------------------------------------------------------------
	4
	5	This is an example capture of I2C traffic on a DDR SDRAM's EEPROM chip, for
	6	Serial Presence Detect (SPD) data. The 512MB DDR RAM module was inserted
	7	in a GIGABYTE 6VLE-VXL mainboard. After the capture was started, the board
	8	was powered-on, thus the captured data corresponds to the BIOS code which
	9	reads the RAM module's EEPROM contents (in order to properly initialize
	10	the RAM).
	11
	12	Additionally, it turned out that on the same I2C bus, there is an additional
	13	I2C device, the ICS950908 "Programmable Timing Control Hub for P4" (a clock
	14	generation chip). The capture also contains the I2C-based configuration of
	15	that chip by the BIOS.
	16
	17	Details:
	18	https://en.wikipedia.org/wiki/Serial_presence_detect
	19	http://pdf1.alldatasheet.com/datasheet-pdf/view/90645/ICST/ICS950908.html
	20
	21
	22	Logic analyzer setup
	23	--------------------
	24
47cd3c8f	25	The logic analyzer used was a Saleae Logic (at 2MHz):
c83a7da3 UH	26
	27	Probe I2C pin
	28	-------------------
	29	1 (black) SCL
	30	4 (orange) SDA
	31
	32
	33	Data
	34	----
	35
	36	The sigrok command line used was:
	37
	38	sigrok-cli -d 0:samplerate=2mhz --time 10s -o <filename>
	39