1 -------------------------------------------------------------------------------
2 GIGABYTE 6VLE-VXL I2C data
3 -------------------------------------------------------------------------------
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
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.
18 https://en.wikipedia.org/wiki/Serial_presence_detect
19 http://pdf1.alldatasheet.com/datasheet-pdf/view/90645/ICST/ICS950908.html
25 The logic analyzer used for capturing was a Saleae Logic:
36 The sigrok command line used was:
38 sigrok-cli -d 0:samplerate=2mhz --time 10s -o <filename>