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author | Uwe Hermann <uwe@hermann-uwe.de> | 2012-01-19 13:47:13 +0100 |
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committer | Uwe Hermann <uwe@hermann-uwe.de> | 2012-01-19 13:47:13 +0100 |
commit | c83a7da3a95d3e9b5ead986ac16e2d5d941ce952 (patch) | |
tree | f32d20192d74af900c3a3886ffcaaf96b092c222 /i2c/gigabyte_6vle-vxl_i2c/README | |
parent | ed59014b774e53a800bd7326066d29c22cc2fab3 (diff) | |
download | sigrok-dumps-c83a7da3a95d3e9b5ead986ac16e2d5d941ce952.tar.gz sigrok-dumps-c83a7da3a95d3e9b5ead986ac16e2d5d941ce952.zip |
I2C dump on a GIGABYTE 6VLE-VXL mainboard.
Diffstat (limited to 'i2c/gigabyte_6vle-vxl_i2c/README')
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diff --git a/i2c/gigabyte_6vle-vxl_i2c/README b/i2c/gigabyte_6vle-vxl_i2c/README new file mode 100644 index 0000000..75abedd --- /dev/null +++ b/i2c/gigabyte_6vle-vxl_i2c/README @@ -0,0 +1,39 @@ +------------------------------------------------------------------------------- +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 for capturing was a Saleae Logic: + + 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> + |