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DRAM Training DRAM 一直有一个比较麻烦的初始化过程，就是 DRAM Training，其中很重要的一步就是计算出各个数据线相对于时钟的偏移（skew）。这个偏移是怎么来的呢？
我们知道，对于 SRAM，如果想要更多的位宽，只需要把地址线和控制信号连接到多个 SRAM 上，然后把 SRAM 的数据信号并行连接到 FPGA 上就可以了，但是前提是要尽量保证等长，否则一样有偏移的问题。DRAM 也是采用类似的方法进行扩展的，但是 DRAM 通常需要并行连接很多个芯片，例如…

What Is High Speed Board Design?
As the name suggests, a high speed printed circuit board design provides the transmission of signals at high speeds. In other words, a device with a high speed design PCB can transfer data at a very high rate. This capability…

This article discusses using CSS to make spinning 3D diagrams.

The extended BPF (eBPF) virtual machine allows programs to be loaded into and executed with the [...]

The “Build Your Own Database”
book is finished

最近才知道，除了 TLS 指纹，竟然还有 HTTP/2 指纹，这两种 Cloudflare 都有采用，这篇博客介绍如何绕过它们。 起因 最近发现之前写的搜图 Bot 坏掉了，这个 Bot 接入了 3 个搜索后端，出问题的是 ascii2d.net。由于它最近套上了 Clo

约定

I reversed the firmware of my Garmin Forerunner 245 Music back in 2022 and found a dozen or so vulnerabilities in their support for Connect IQ applications. They can be exploited…

An unfortunate side effect of the rising popularity of Apple’s ARM-based computers is an increase in unportable assembly code which targets the 64-bit ARM ISA. This is because developers are writing these bits of assembly code to speed up their programs when…