... | @@ -38,8 +38,9 @@ |
... | @@ -38,8 +38,9 @@ |
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BOM](https://edms.cern.ch/ui/file/1165461/1/EDA-02063-V5-0_pcb-mat.pdf)
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BOM](https://edms.cern.ch/ui/file/1165461/1/EDA-02063-V5-0_pcb-mat.pdf)
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6. Verify that the BOM is completely generated out of the schematics.
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6. Verify that the BOM is completely generated out of the schematics.
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If not, create the correct symbol.
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If not, create the correct symbol.
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- This prevents that someone else later will have surprises.
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7. Verify that the BOM does not contain any components that are at
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7. Non-mounted components should be marked in the schematics as such.
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end-of-life (EOL), obsolete or hard to get.
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8. Non-mounted components should be marked in the schematics as such.
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And it should be clear from the BOM that they should not be mounted.
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And it should be clear from the BOM that they should not be mounted.
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## Study schematics
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## Study schematics
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... | @@ -79,17 +80,19 @@ |
... | @@ -79,17 +80,19 @@ |
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2. Check that schematics read from left to right. Make the signals flow
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2. Check that schematics read from left to right. Make the signals flow
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that direction: i.e., inputs on the left, outputs on the right of
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that direction: i.e., inputs on the left, outputs on the right of
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the page.
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the page.
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3. Power symbol for positive supply should point up. Those for negative
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3. Align components on a page.
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4. Show clearly from which power supply each component is powered.
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5. Power symbol for positive supply should point up. Those for negative
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supplies and GND should point down.
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supplies and GND should point down.
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4. Name power P3V3, M5V0, GND, AGND etc.
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6. Name power P3V3, P5V, M5V, GND, AGND etc.
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5. Clock signals: add frequency in name (eg. CLK\_100, CLK20\_VCXO).
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7. Clock signals: add frequency in name (eg. CLK\_100, CLK20\_VCXO).
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6. Negative signal names: suffix \_N (e.g. PB\_RESET\_N), do not use
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8. Negative signal names: suffix \_N (e.g. PB\_RESET\_N), do not use
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over-line that disappears in text files.
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over-line that disappears in text files.
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7. Number components simply, like R1, R3, C1, L1 etc. Do not use names
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9. Number components simply, like R1, R3, C1, L1 etc. Do not use names
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like Rbias1 and Cin2 as one may see used in datasheets.
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like Rbias1 and Cin2 as one may see used in datasheets.
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8. Unused signals available on connectors (e.g. P12V, VADJ): do not
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10. Unused signals available on connectors (e.g. P12V, VADJ): do not
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connect a wire to them, leave open.
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connect a wire to them, leave open.
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9. Mark resistor values as follows: 47 (for 47 Ohm), 4R7 (for 4.7 Ohm),
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11. Mark resistor values as follows: 47 (for 47 Ohm), 4R7 (for 4.7 Ohm),
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4K7 (for 4.7 kOhm = 4700 Ohm)
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4K7 (for 4.7 kOhm = 4700 Ohm)
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## FMC mezzanine cards
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## FMC mezzanine cards
|
... | @@ -124,7 +127,8 @@ |
... | @@ -124,7 +127,8 @@ |
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(front-panel and 'arrangement')
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(front-panel and 'arrangement')
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2. Make sure that all texts, indications and annotations are written in
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2. Make sure that all texts, indications and annotations are written in
|
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English.
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English.
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3. Document all inputs and outputs on the schematics pages
|
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3. Check and remove any DRC error flags.
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4. Document all inputs and outputs on the schematics pages
|
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- voltage and current on external power connectors
|
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- voltage and current on external power connectors
|
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- voltage level and input impedance on coax inputs
|
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- voltage level and input impedance on coax inputs
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- voltage level and output impedance or drive level on outputs
|
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- voltage level and output impedance or drive level on outputs
|
... | @@ -132,5 +136,5 @@ |
... | @@ -132,5 +136,5 @@ |
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-----
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-----
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Erik van der Bij - 27 February 2018
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Erik van der Bij - 28 February 2018
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