Novena DVT to PVT ECO List
Novena DVT to PVT changes
This is a list of all the changes applied to the board from DVT1 to PVT1 release. If it's not on this list, it didn't happen.
Each change has the format of issue summary/resolution, and specific change
ECO1: Fix Gig-E termination
KSZ9021RN refclk output pull-up drive is weak. Terminate with a 300-ohm pull-up, instead of the proposed AC termination network.
|R20S 49.9, 1% / REC1005N||DNP||Gigabit ethernet|
|C16S 2200pF, X7R, 50V, 10% / CAPC1005N||DNP||Gigabit ethernet|
|added||300, 1% / RES1005N||Gigabit ethernet|
ECO2: Remove FPGA clock termination
Use internal FPGA differential termination for clock. Electrically superior to discrete solution.
|R57B 100, 1% / REC1005N||DNP||FPGA|
ECO3: Clarify D14D orientation
Added fab note on bottom silkscreen layer (outside PCB but inside assy dwg) to indicate that D14D is a side-firing LED. Fab was orienting LED accidentally as vertically firing LED.
ECO4: Add clock margin to Gbit ethernet
RGMII spec assumes an extra 10 inch delay added to the clock wire versus data wire, required to be implemented on the PCB. This is software-compensated by tweaking PHY parameters in the Micrel PHY, but we add these delay line options just in case that option turns out to be unworkable.
TXC line gets 5" added by default in this configuration because it's impossible to measure if the TXC line is adequately delayed and out of paranoia we split the difference.
|Added||R24G 0 ohm / RES1005N||RX clock path (0 inch option)|
|Added||R22G 0 ohm (DNP)||Rx clock path (5 inch option)|
|Added||R23G 0 ohm (DNP)||Rx clock path (5 inch option)|
|Added||R30G 0 ohm (DNP) / RES1005N||TX clock path (0 inch option)|
|Added||R28G 0 ohm||Tx clock path (5 inch option)|
|Added||R29G 0 ohm||Tx clock path (5 inch option)|
|Added||R27G 0 ohm||Tx clock path (5 inch option)|
|Added||R25G 0 ohm (DNP)||Tx clock path (10 inch option)|
|Added||R26G 0 ohm (DNP)||Tx clock path (10 inch option)|
In addition to these components, a trace is run through the PCB adding these delays.
ECO5: Swap switch to more robust and cheaper version
Change out switch to pushbutton type available via HQB. No change in PCB, just BOM swap.
|SW11B TS-1187A, Chi Fung (DNP)||TL3342F160QG/TR (DNP)||or equiv (see trigger on chibitronics)|
|SW10B TS-1187A, Chi Fung||TL3342F160QG/TR||or equiv|
|SW10S TS-1187A, Chi Fung||TL3342F160QG/TR||or equiv|
|SW11S TS-1187A, Chi Fung||TL3342F160QG/TR||or equiv|
ECO6: 32.768kHz crystal EOL
Swap out Y11B for part that is not slated for EOL. This does involve a footprint swap.
|Y11B ABS10-32.768KHZ-7-T 7pF CL||ABS06-32.768KHZ-T 12.5pF CL|
ECO7: 12.0000 MHz wrong PN
The part numbers for Y10U and Y11U are for the wrong package size.
|Y10U 12.0000 MHz (SaRonix-eCera F9, 30ppm, 8pF)||12.0000 MHz (NDK NX5032GB-12MHZ-STD-CSK-5, 30ppm, 8pF)|
|Y11U 12.0000 MHz (SaRonix-eCera F9, 30ppm, 8pF)||12.0000 MHz (NDK NX5032GB-12MHZ-STD-CSK-5, 30ppm, 8pF)|