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doc: move VADJ, closes #554

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Sebastien Bourdeauducq 2016-09-09 18:40:58 +08:00
parent e75002a109
commit f23ebc035b
1 changed files with 6 additions and 2 deletions
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8
doc/manual/core_device.rst
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@ -38,6 +38,12 @@ Common problems
* When connected, QC1 and CLOCK adapters break the JTAG chain due to TDI not being connect to TDO on the FMC mezzanine.
* On some boards, the JTAG USB connector is not correctly soldered.
VADJ
++++
With the NIST CLOCK and QC2 adapters, for safe operation of the DDS buses (to prevent damage to the IO banks of the FPGA), the FMC VADJ rail of the KC705 should be changed to 3.3V. Plug the Texas Instruments USB-TO-GPIO PMBus adapter into the PMBus connector in the corner of the KC705 and use the Fusion Digital Power Designer software to configure (requires Windows). Write to chip number U55 (address 52), channel 4, which is the VADJ rail, to make it 3.3V instead of 2.5V. Power cycle the KC705 board to check that the startup voltage on the VADJ rail is now 3.3V.
NIST QC1
++++++++
@ -149,8 +155,6 @@ To avoid I/O contention, the startup kernel should first program the TCA6424A ex
See :mod:`artiq.coredevice.i2c` for more details.
For safe operation of the DDS buses (to prevent damage to the IO banks of the FPGA), the FMC VADJ rail of the KC705 should be changed to 3.3V. Plug the Texas Instruments USB-TO-GPIO PMBus adapter into the PMBus connector in the corner of the KC705 and use the Fusion Digital Power Designer software to configure (requires Windows). Write to chip number U55 (address 52), channel 4, which is the VADJ rail, to make it 3.3V instead of 2.5V. Power cycle the KC705 board to check that the startup voltage on the VADJ rail is now 3.3V.
Pipistrello
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