Introductory message from Kurtis

firmware/targets/ScrodRevB_b2tt_gigE/  [firmware]
belle2/itop/electronics/trunk/software/gigE/ [software]

Note that in the firmware "targets" subdirectories there is not much except the top level vhdl for the project and the constraints (xdc).  The majority of the firmware lives in the "modules" directory:

belle2/itop/electronics/trunk/firmware/modules/

The b2tt_gigE project is relatively modest and is meant to provide a simple way to test whether a SCROD is working.  To do so, you need:

- SCROD Rev B
- FTSW (if you want remote clocking)
- (Optional) IRSX Rev B FMC to plug into the SCROD Rev B
- (Optional) if using the above, a very strange CAT5/6/7 cable that I'll describe below
- Media converter or fiberoptic gigabit Ethernet card
- Power supplies, a signal generator for triggers, some patience, etc.

The optional FMC card is for translation of a single ended trigger signal (0 - 2.5 V into 50 ohm) into an LVDS pair for reception by the FTSW.  If you have some other LVDS translation scheme, by all means do what's easier.

If you're using the IRSX FMC Rev B... make sure first that the DAC on it (U5) is either removed or reworked.  If removed, you may need to rig up a small circuit for pedestal voltage generation (though not relevant for this firmware release, it will be if you want reasonable IRSX data out in an upcoming release).  Schematics for this board are posted here:

http://www.phys.hawaii.edu/~idlab/taskAndSchedule/PCBs/DC_IRSX_FMC_EVAL_REVB/DC_IRSX_FMC_EVAL_REVB_SCH.pdf

I found it rather convenient to use the breadboard area for this.  Please let me know if you need some assistance in this regard, as I can describe what I did.

 I recommend using it in "5 V" mode with an external power supply.  If you need to make a power cable for it, the power pins are on the outside (+5 V) and grounds are the two center.  Despite the fact that it says "5 V" you should give it at least 5.5 V to get one of the regulators out of dropout.

System trigger signals (are accepted in through the "AUX_OUT" MMCX connector on the FMC card.  These are passed through the FMC connector, to the FPGA, and back up to the RJ45 as an LVDS signal on pins 2 and 7.  The cable used to connect to FTSW should go to the AUX port, and the mapping on the cable should be 2 <-> 7, 7 <-> 8.

Powers for the SCROD that I've been using are:

RAW1: 1.87 V
RAW2: 3.15 V
RAW3: 4.33 V

Jumpers should be installed in the following locations, looking at SCROD Rev B on the FMC connector side of the board with the FMC connector facing up.  The following are described top to bottom in this orientation.

(left set of jumpers, J2)
J2-A : off
J2-B : on  [if using FTSW, off if using standalone clocking]
J2-C : off
J2-D : on

(right set of jumpers, J1)
J1-A : off
J1-B : off
J1-C : on
J1-D : off

If you need to do things with the PS, I'll have to double check these again, but these settings should be valid for the firmware in the repo right now.  If you want to see what jumpers do what, check page 1, lower right corner on the SCROD Rev B schematics here:

http://www.phys.hawaii.edu/~mza/PCB/SCROD/SCROD.revB.schematic.pdf

I recommend programming via JTAG through the FTSW as well, if you're using it.  There are no special switches or toggles to get the programming through JTAG to work.  Just plug the JTAG RJ45 cable from the SCROD Rev. B into a JTAG appropriate port (see ft2u.pdf for details on how to wire up your flying leads and what ports are valid).   Do make sure you have the latest FTSW firmware.

The connection via gigabit Ethernet should be on the "DATA" SFP (you may have to plug in a transceiver if one isn't there yet).  The firmware only supports point-to-point UDP, so please wire up appropriately.

Power everything up... program the SCROD with the firmware.  You can use the existing image if you like:

belle2/itop/electronics/trunk/firmware/targets/ScrodRevB_b2tt_gigE/images/ScrodRevB_b2tt_gigE_B0000000.bit

You should see the green light go up on the appropriate timing link RJ45 port of the FTSW after the SCROD comes up.  You should also be able to arping the SCROD at 192.168.1.20.  Due to what I believe are some autonegotiation issues, it may take ten or more seconds for the arping to come up properly.  Once it does, though, you should be all set.  Open up the GUI from the software branch and try to read/write registers or configuration in the appropriate tabs.  If you can do that successfully, you should also be able to issue triggers.  For each one, you'll receive a short header and some PRBS data.

Obviously this is a lot of info, and a lot is missing.  Please see here for more details on compiling, etc.:

https://www.phys.hawaii.edu/elog/iTOP-IRS3/210

It is an old release for the ZC706, but a lot applies here as well.  Working on more detailed docs for everything, but hopefully this gives people a chance to start to get things online