From f23ebc035b6ada17d13d042bad39996fd326b825 Mon Sep 17 00:00:00 2001 From: Sebastien Bourdeauducq Date: Fri, 9 Sep 2016 18:40:58 +0800 Subject: [PATCH] doc: move VADJ, closes #554 --- doc/manual/core_device.rst | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/doc/manual/core_device.rst b/doc/manual/core_device.rst index 36c36be69..eae66caa2 100644 --- a/doc/manual/core_device.rst +++ b/doc/manual/core_device.rst @@ -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 -----------