Viewing profile — azonenberg

Late to the party here but I didn't see until now. Looking at the layout I'm very confident this controller is fully analog, with just a few gates of digital doing control stuff. T…

You could build an NTP server with much less horsepower (and of course without all of the high speed I/O etc). The ones from Leo Bodnar are decent.

Yeah it's always tricky to decide how much detail to include in these posts. If I had gone on a whole explanation of the full 7 series GTX clocking architecture the post would easi…

Yep. Although given all of the bugs, I don't recommend anyone try to build one without forking and making substantial design changes :)

Those addresses all make sense, as 0x4000 - 4fff appears to be where the 8051 has its RAM mapped (all of the peek/poke addresses used for accessing serdes fields are on the high en…

I avoid vendor toolchains and BSPs just because of how buggy they are. From my perspective, it's much better to reproduce a bug with a 20-line C or assembler file that compiles wit…

I did not like that part of it. Personally I've standardized on just three STM32 parts: * L031 for throwaway-cheap stuff where I'm never going to do field firmware updates (so no n…

I don't think I've ever used a ST part without reporting a bunch of datasheet errors. I haven't been bit by an undocumented silicon bug, but I step on documented STM32H7 bugs on a …

This is why I used a VSC PHY. After they bought Microsemi (and Vitesse as a division of Microsemi) it looked like the only viable option to get a QSGMII PHY since all the other pla…

Yes, Vitesse had been on my "naughty list" of companies that were permanently banned from getting a design win from me because of refusing to share any docs or sell parts at distri…

I have not used anything but arm-none-eabi-gcc for STM32s from day one. Never even installed CubeMX or any other ST software.

No idea, the high power consumption and latency of >1000baseT were such that I've never had any interest in anything newer in baseT land. At home I run 10/100/1000baseT, 10Gbase-SR…

The board-level architecture is going to be super simple as big FPGA designs go: * XCKU5P in the middle * 12x GTYs routed to 4x Samtec ARF6 connector for the line cards * 2x GTYs r…

You're going to at least want to AC couple through some capacitors to avoid problems with common mode / RX bias issues between the different PHYs. But if it's on-mobo you don't nee…

For context of how lightweight this is, an -O3 release build of my entire firmware on the management processor right now (including the sshd, hardware drivers, TCP/IP stack, the CL…

The code is at https://github.com/azonenberg/staticnet but I've intentionally avoided over-publicizing it since it hasn't had any kind of third party security review. As of now it'…

The overall system will be powered by 48V DC on a 6-pin Molex Mini-Fit Jr connector, then stepped down to 12V by a 48->12V intermediate bus converter I've previously designed and c…

I've wargamed how I'd backdoor an FPGA even given the ability to make a completely new mask set from a fork of the original CAD files, and it's really difficult. You'd either have …

There are no blobs I'm aware of anywhere that are actually running in the system. The STM32s have a small boot "ROM" burned into a write-protected region of flash but I have it jum…

This is not going to be cheap. That was never the goal. In low volume when you combine several custom multilayer boards, custom powder-coated sheet metal work, etc even if you allo…

This project dates back to circa 2013 when at the time, there was nothing available in that class without NDAs. Once I got set on the path of going custom I didn't want to back off…

The plan is 96 ports total for my own use, split across two 48-port 1U switches. And that's something that is now well within reach: I have the power boards assembled and ready to …

I have some obviously reballed (but well done) aliexpress XCKU5P's that I got for $55 a while back. Haven't tested yet but the price was so good I couldn't resist.

It's a documented errata, 2.6.1 on page 8 of ES0491.

Yeah but again, we're talking about the FMC here not the OCTOSPI. Have you hit issues with the FMC? From what other people are telling me, the OCTOSPI is full of land mines and the…