forked from sinara-hw/assembly
Update clocking page with clocker
Signed-off-by: Egor Savkin <es@m-labs.hk>
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@ -3,7 +3,8 @@
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This page describes ways to set up clocking. Official documentation references:
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This page describes ways to set up clocking. Official documentation references:
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* [Carrier configuration](https://m-labs.hk/artiq/manual/installing.html#miscellaneous-configuration-of-the-core-device)
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* [Carrier configuration](https://m-labs.hk/artiq/manual/installing.html#miscellaneous-configuration-of-the-core-device)
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* Devices' [available options](https://m-labs.hk/artiq/manual/core_drivers_reference.html), [Urukul example](https://m-labs.hk/artiq/manual/core_drivers_reference.html#artiq.coredevice.urukul.CPLD)
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*
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Devices' [available options](https://m-labs.hk/artiq/manual/core_drivers_reference.html), [Urukul example](https://m-labs.hk/artiq/manual/core_drivers_reference.html#artiq.coredevice.urukul.CPLD)
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In general, any RF card and Carriers require some clock source. Most of them have both internal clock signal generator
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In general, any RF card and Carriers require some clock source. Most of them have both internal clock signal generator
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and external MMCX and/or SMA connectors to accept the signal. By default the internal clock is used for Carriers,
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and external MMCX and/or SMA connectors to accept the signal. By default the internal clock is used for Carriers,
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@ -51,9 +52,11 @@ default-ish [CONFIG.TXT](../extra/CONFIG.TXT) to the SD card near (same level) `
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## RF Devices (Except Clocker)
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## RF Devices (Except Clocker)
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If you want to set the clock source specifically for RF devices, you will just need to update the JSON file and [regenerate device_db.py file](device_db.md).
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If you want to set the clock source specifically for RF devices, you will just need to update the JSON file
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and [regenerate device_db.py file](device_db.md).
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For example for Urukul, you will just need to check the manual for available variants and apply them in the JSON file, so Urukul entry may look like this:
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For example for Urukul, you will just need to check the manual for available variants and apply them in the JSON file,
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so Urukul entry may look like this:
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```json
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```json
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{
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{
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@ -62,7 +65,17 @@ For example for Urukul, you will just need to check the manual for available var
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```
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```
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So basically, `clk_sel` and `refclk` fields need to be set:
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So basically, `clk_sel` and `refclk` fields need to be set:
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* `clk_sel` selects the source clock, where 0 - internal 100MHz XO; 1 - front-panel SMA; 2 internal MMCX
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* `clk_sel` selects the source clock, where 0 - internal 100MHz XO; 1 - front-panel SMA; 2 internal MMCX
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* `refclk` - reference clock frequency in Hz
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* `refclk` - reference clock frequency in Hz
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These settings may need to be checked with official manual and may differ from device to device.
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These settings may need to be checked with official manual and may differ from device to device.
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## Clocker card
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Main page: [clocker.md](../hw/clocker.md)
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Clocker card allows to distribute clock signal up to 1 GHz without additional software setup. Therefore, there is no way
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to set it to generate signal, which would be different from input. The only setup allowed is to set to accept signal
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from `EXT`/`INT` ports, front-panel SMA or card's MMCX ports respectively, by switching the `CLK SEL` switch on the
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card ![](../img/clocker_ref.jpg).
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