The first version of HelperA64 core board design

spacexplorer

The first version of HelperA64 core board design [Copy link]

My core board design philosophy includes the following principles: 1. High-speed integration, the necessary circuits with a little difficulty should be placed on the core board (for example: DDR) 2. Excellent stability and anti-interference performance 3. Reasonable interface definition, making the bottom board very easy to route 4. Beautiful layout, uniform heating of the whole board 5. Reasonable PCB design, easy production and maintenance The first version of the HelperA64 interface definition is as follows: This figure was designed by a senior hardware engineer who I hired at a relatively high price. In the end, because of making such a core board interface, I was fired. Looking carefully at the definition of each line sequence, it is not defined according to the requirements of general peripherals at all. For example, the line sequence of HDMI is completely opposite to the standard HDMI interface. In this way, the HDMI line coming out of the two-layer board of the bottom board is difficult to meet the high-speed transmission requirements. For example, the SD card interface line and the RGB LCD interface line have the same problem. In addition, the pins on the left and right sides are the same, but asymmetrical, which is extremely unsightly. This was the result after I had made a request in advance, which was completely contrary to the interface design of my previous helper2416 core board. In the end, I wasted several thousand yuan in board fees. I think such a hardware engineer is unqualified, so I was not so polite. To be continued...

sanhuasr

What is HelperA64?

hongyancl

The asymmetry of the pins on the left and right sides does not matter much. The key is that the line sequence of the interface must correspond to the interface of the baseboard, and the baseboard is convenient for wiring.

spacexplorer

sanhuasr posted on 2018-2-11 22:45 What is HelperA64?

It is the name of a core board

spacexplorer

hongyancl Posted on 2018-2-12 09:03 The asymmetry of the pins on the left and right sides does not matter much. The key is that the line sequence of the interface must correspond to the interface of the baseboard, and the baseboard is convenient for wiring.

What you said is also right, but for our profession as electricians, our products are like our own children. If there are imperfections, we must try our best to find ways to improve them. It can also be regarded as a kind of pursuit.

通宵敲代码

Poor guy, I sympathize with him. Senior engineers from large companies are prone to make these mistakes. Large companies don't care about costs. They will invest a lot of energy in the early stages of development to accurately design the product. Subsequent work is all based on the solution guide. Without the guidance of the solution, it is understandable that these mistakes are made. It also shows that the person you hired may not be a senior hardware engineer, but probably just a senior layout engineer.

spacexplorer

Posted by Typing Code All Night on 2018-2-27 09:20 Poor guy, I sympathize with him. Senior engineers from large companies are prone to make these mistakes. Large companies do not care about costs and will invest a lot in the early stages of development...

You have a point!

dzxxlxd

Is it based on the official A64-STD schematic of Allwinner? What adjustments have been made? Could you explain it?