Difference between revisions of "VFAT readout electronics"
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A VFAT board from CERN is evaluated for use as a readout board to convert the GEM output analog signal to a digital signal. | A VFAT board from CERN is evaluated for use as a readout board to convert the GEM output analog signal to a digital signal. | ||
| − | [[LVDS]]<br> | + | [[LVDS]]<br/> |
| − | [[I2C]]<br> | + | [[I2C]]<br/> |
| + | == Breakout box specs (preliminary) == | ||
| + | * 6 (or 8) inputs for ~1m ribbon cables from VFAT modules | ||
| + | * 3-bit DIP switch to select I2C address range for each VFAT | ||
| + | * Soft reset button for each VFAT? | ||
| + | * Hard reset button for each VFAT? | ||
| + | * [[Scan Mode]] switch | ||
| + | * ScanIn connector (cascaded) | ||
| + | * ScanOut connector (cascaded) | ||
| + | * RJ45 port to gumstix box containing [[I2C]] signals: | ||
| + | ** Power (3.3 or 2.5V) | ||
| + | ** Ground | ||
| + | ** SDA | ||
| + | ** SCL | ||
| + | * 34 pin ribbon connector for [[LVDS]] signals | ||
| + | * LEMO connector for LVDS trigger input | ||
| + | * LEMO connector for LVDS Master Clock | ||
| + | * I2C EPROM for testing?? (socketed) | ||
| + | * I2C expander(s) for status LEDs (socketed) | ||
| + | * Status LEDs: | ||
| + | ** Power (from I2C line) | ||
| + | ** I2C connect (flashing through I2C expand) | ||
| + | ** LVDS trigger status?? | ||
| + | ** Power for each VFAT (feedback through common pins on VFAT board?) | ||
| + | ** I2C address ranges seen (0x0* - 0x8*) | ||
== Ribbon cable pinouts == | == Ribbon cable pinouts == | ||
Revision as of 01:23, 28 June 2007
A VFAT board from CERN is evaluated for use as a readout board to convert the GEM output analog signal to a digital signal.
Breakout box specs (preliminary)
- 6 (or 8) inputs for ~1m ribbon cables from VFAT modules
- 3-bit DIP switch to select I2C address range for each VFAT
- Soft reset button for each VFAT?
- Hard reset button for each VFAT?
- Scan Mode switch
- ScanIn connector (cascaded)
- ScanOut connector (cascaded)
- RJ45 port to gumstix box containing I2C signals:
- Power (3.3 or 2.5V)
- Ground
- SDA
- SCL
- 34 pin ribbon connector for LVDS signals
- LEMO connector for LVDS trigger input
- LEMO connector for LVDS Master Clock
- I2C EPROM for testing?? (socketed)
- I2C expander(s) for status LEDs (socketed)
- Status LEDs:
- Power (from I2C line)
- I2C connect (flashing through I2C expand)
- LVDS trigger status??
- Power for each VFAT (feedback through common pins on VFAT board?)
- I2C address ranges seen (0x0* - 0x8*)
Ribbon cable pinouts
| # | Name | Value | Test rig color Primary/Second |
| B1 | DGND | Digital Ground | Black/Grey (shared) |
| A1 | DVDD | +2.5V | Red/Grey (shared) |
| B2 | SDA | I2C Data | Green/Yellow |
| A2 | SCL | I2C Clock | Yellow/Green |
| B3 | DGND | Digital Ground | Black/Grey (shared) |
| A3 | DVDD | +2.5V | Red/Grey (shared) |
| B4 | |||
| A4 | |||
| B5 | I2C ADDR 2 | I2C Address Most | White/Blue |
| A5 | I2C ADDR 1 | I2C Address Middle | White/Orange |
| B6 | I2C ADDR 0 | I2C Address Least | White/Green |
| A6 | REH-S | Soft Reset (Program saved) | White/Grey |
| B7 | |||
| A7 | REH-B | Hard Reset | Grey/White |
| .............. | |||
|---|---|---|---|
| B22 | DGND | Digital Ground?? | |
| A22 | SCAN E | ||
| B23 | AGND | Analog Ground | |
| A23 | AVDD | 2.5V | Grey/Red |
| B24 | AGND | Analog Ground | |
| A24 | AVDD | 2.5V | Grey/Red |
| B25 | AGNDD | Analog Ground?? | Grey/Black |
| A25 | AVDD | 2.5V | Grey/Red |
The PC board-mount socket for the cable is ERNI 154765 for reel or ERNI 063197 for tube packaging.
The cable crimp-ons are ERNI 024403 or premade cables 300mm long are ERNI 173795