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Zynq-7000 PCB, Round Two (PCIe?)
Over the past year, I took a shot at designing a Zynq-7000-based development board. I am now considering an update to my first board --...

rehsd
Mar 233 min read
86 views
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Upgrading to a Faster Zynq-7000
Over the last few months, I have continued to experiment with my Zynq-7000 board . My board has been running well and is very stable. The...

rehsd
Mar 92 min read
77 views
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Zynq-7000 Audio with WM8960 in PetaLinux
I am hoping to get audio support for my custom Zynq-7000 development board. After a little digging into options, I am currently focusing...

rehsd
Jan 254 min read
111 views
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Microchip AVR64DU28 Development Board with EasyEDA Pro
Recently, I received a request to walk through the creation of a two-layer, through-hole PCB in EasyEDA Pro. As I considered what kind of...

rehsd
Jan 13 min read
62 views
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PetaLinux and My Zynq-7000
As my custom Zynq-7000 board has been working fairly well (see my previous blog post ), I have been learning about PetaLinux. I am...

rehsd
Jan 11 min read
78 views
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Xilinx XC7Z020-1CLG484I (Zynq-7000 SoC, Artix-7 FPGA)
Recently, I have been working on different MCU and FPGA development boards. The FPGAs to this this point have been simpler, or older,...

rehsd
Apr 6, 20246 min read
2,099 views
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Xilinx XC5215-6PQ160C FPGA
I have a batch of Xilinx XC5215-PQ160AKMOO21 FPGAs. These are old FPGAs and it will be a challenge (if not impossible for me) to get one...

rehsd
Mar 22, 20242 min read
116 views
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Xilinx Spartan-3AN Dev Board Build
I am just beginning to work on a dev board for a Xilinx Spartan XC3S200AN-FTG256AGQ1413. I plan to use this page to capture information...

rehsd
Mar 19, 20241 min read
143 views
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Lattice iCE40 FPGA Journey
As part of my post on MCUs, I added a Lattice iCE40 FPGA to the mix. While I have done a little bit of work with FPGAs in the past, it...

rehsd
Feb 8, 20242 min read
628 views
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My Personal PCB Checklist
As I am working to improve my PCB design capabilities, I will update this list as a sort of "quality checklist." If you have suggestions...

rehsd
Jan 24, 20242 min read
154 views
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MCU (and some FPGA) Fun
I am starting to experiment with different microcontrollers (MCUs). I am hoping to learn about 8-bit, 16-bit, and 32-bit MCUs -- from a...

rehsd
Jan 17, 20244 min read
419 views
1 comment


486DLC >>> 486DX PCB Design Updates
As I have gotten my 386 DX upper and lower motherboard PCBs working -- at least to the point of validating much of the design -- I am now...

rehsd
Nov 26, 20236 min read
395 views
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Agilent 1680/1690 Logic Analyzers
Historically, I have used simple "debuggers" / "analyzers" that leveraged an Arduino Mega, STM32, or Teensy to sample signals and either...

rehsd
Oct 28, 20234 min read
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Teensy-based Debugger
I have previously used Arduino Mega and STM32 devices to capture signal data for logging and debugging. I have been working on a...

rehsd
Oct 23, 20231 min read
44 views
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386 DX - EATX Build
Picking up from 80386 DX Build (rehsdonline.com), I am transitioning my 386 DX build to an EATX form factor, incorporating changes up to...

rehsd
Oct 8, 20231 min read
228 views
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386SX Upgrade / 386DX - Glue Logic, Bus Control PALs, GALs, PLDs, ...
For my 286 to 386SX upgrade interposer PCB, I need to implement logic for S0# and S1# (along with a few other signals). For my 386DX...

rehsd
Jul 8, 20234 min read
277 views
2 comments


Using an Assembly Library from C++ for Applications in FreeDOS (on My 286 Build)
YouTube user @viti95 suggested avoiding making calls to other procedures within the assembly code, as just the CALL process has overhead....

rehsd
Jun 25, 20231 min read
66 views
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80386 DX Build
While I continue to build out my 286 (386 SX) system, I thought I would start learning more about the 80386 DX. I am hoping to have a...

rehsd
Jun 19, 20232 min read
606 views
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386SX Upgrade
I'm looking into a 386SX upgrade for my 286 build. The Intel 386 Hardware Reference Manual includes the following schematic for...

rehsd
Jun 15, 20232 min read
872 views
2 comments


Accessing More RAM
I am researching how to add additional RAM to my 286 build. I started by thinking about a memory expansion card for my system. That has...

rehsd
Jun 13, 20232 min read
148 views
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