Support #3523
closed
assemble + test SFP experimentation board with LVDS transceivers onboard
Added by laforge over 5 years ago.
Updated over 5 years ago.
Description
Following the design of #3314, let's assemble and test the first board to verify the design.
Files
- Due date set to 06/05/2018
- Start date changed from 09/05/2018 to 06/05/2018
- Follows Feature #3314: design simple SFP experimentation board with LVDS transceiver added
- Status changed from New to In Progress
it seems i missed that we do not have the lvds transmitters yet yesterday.
so IC1 is still missing, the rest is placed.
On Wed, Sep 05, 2018 at 04:02:45PM +0000, roh [REDMINE] wrote:
it seems i missed that we do not have the lvds transmitters yet yesterday.
So you're trying to tell me that I forgot to order them?
The SN65LVDS1DBVR are missing for whatever reason.
SN65LVDS1DBVR is out of stock at farnell until october. But the SN65LVDS1DBVT is available.
On Fri, Sep 07, 2018 at 06:03:46PM +0000, mschramm [REDMINE] wrote:
The SN65LVDS1DBVR are missing for whatever reason.
will order them from digikey.
SN65LVDS1DBVR have arrived.
all parts placed, tests have started...
- Status changed from In Progress to Resolved
- Assignee changed from roh to mschramm
- % Done changed from 0 to 70
ic placed.
board tested.
2 important details:
there was a need to place a bias resistor from RD_N to ground (pin4 on ic2) or the whole board would not work. ic2 has internal 100ohm prom pin3 to pin4 and pullups of ~300k to vcc. 100k pulldown on one leg pushes it into the proper operating range. due to the 100ohm its not neccessary to have more than one pulldown.
the other one is adding arrows on the silkscreen like on the sfp breakout (pointing IN next to IC1, and OUT next to ic2)
(more pictures, explaining roh's and tnt's addition)
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