dfox

21 ms·

241.
by dfox 3y ago
It is almost certainly the other way around. Even 1000-base-T PHY is complex block of analog magic that draws significant power and adds measurable latency over direct SGMII/optical link. In comparison USB4 is even more directly connec
242.
by dfox 3y ago
I meant as an DSP core inside some larger chip, not as free standing DSP. It does not make much sense to design a chip that just contains a Tensillica core and nothing else because you lose all of the customizability and the market for such
243.
by dfox 3y ago
Intel also integrates Tensillica cores as sound DSP (IIRC into PCH not CPU itself). And NXP has some kind of i.MX part that somewhat closely couples Tensillica DSP core(s) to ARM SoC. So I would say that today probably everybody except TI u
244.
by dfox 3y ago
Similar effect can happen the other way around and in fact I have seen that more often (albeit mostly 10 years ago): - create DOCX with change tracking in Word - edit that in LibreOffice and save multiple times - open it in Word modify some
245.
by dfox 3y ago
In my opinion the implementation of glibc (there is a bunch of good reasons for the “weirdness” and a whole lot of gcc-isms) and even the linked example from musl (with somewhat confusing #ifdef block) is a thing that should be in some kind
246.
by dfox 3y ago
If there is requirement to link a github account, then there isn't any kind of decentralization, as github is then the one centralized point. And well, the original idea of blogs was completely decentralized (“there is this thing acces
247.
by dfox 3y ago
The “high-end” PA Class D amplifiers (the kind of thing that is used in clubs on Ibiza and such things) have feedback loop and the feedback loop is closed in purely analog domain around the whole Class D amplifier, alternatively one can loo
248.
by dfox 3y ago
I spent somewhat inordinate amount of time around 2010 by designing a Class D PA amplifier that used DSD-like bitstream internally. The idea was to convert analog input signal into this bitstream by what amounted to somewhat convoluted sigm
249.
by dfox 3y ago
As for the second paragraph: it is not an parallelism in the traditional sense, but as an shortcut in description of the design. To rephrase it in concrete terms: if you implement 128b block cipher as an two independent 64b wide SPN network
250.
by dfox 3y ago
The paper refers to the case where you build a even more secure hash function by concatenating output of multiple presumably secure hash functions. The resulting construction will still be as secure as the strongest component hash function
251.
by dfox 3y ago
I would suggest switching to Meson instead of CMake.
252.
by dfox 3y ago
There are 6 slightly different variants of tar that GNU tar can unpack. In general the tar formats do not have to store the directory record, but the more recent can as to preserve its metadata. Also, modern tar formats generally store UID
253.
by dfox 3y ago
Probably the most authoritative current definition os cpio file format is description of pax utility in Single UNIX Specification, which states that "FIFO special files, directories, and the trailer shall be recorded with c_filesize eq
254.
by dfox 3y ago
For example Czech republic has central register of all residents. The register is intentionally designed so that it does not provide any kind of identifier that is both long-term stable and globally meaningful (there is a number called RČ b
255.
by dfox 3y ago
Another point is that the CPU can sequence the multiple calls to its internal SIMD unit internally without that having to be done by user code. This in extreme case degrades to the Cray-1-like vector unit, which still has measurable preform
256.
by dfox 3y ago
BBM on the BB devices used efficient transport separate from the normal IP support of the network, which is why it was viewed as premium service by the carriers. iOS does something similar as a transport for APNs (and thus iMessages) with t
257.
by dfox 3y ago
For UART this is only about sampling away from the edges. The UART waveform does not have any feature that is usable for clock recovery, the only thing in there is that the start bit (ie. Mark) delineates the start of the frame, how many of
258.
by dfox 3y ago
The idea there is that if you measure the timing between transitions precisely enough you do not have to do a real clock recovery. The FDD motors seem to be precise and stable enough (after some spin-up time) that this approach works and II
259.
by dfox 3y ago
It would be a good match for some kind of input capture peripheral (the MCU does not have input capture per-se but it is an Cortex M7 so you can certainly build that out of interrupt matrix and some clever configuration of DMA engine) or fo
260.
by dfox 3y ago
This! Just pass both the content and query through unidecode and some simple filter that removes stop words and cruft in the content, works wonders for autocomplete. Applying that idea to true full-text search is somewhat more involved (you
261.
by dfox 3y ago
The board level electronics assembly is mostly an solved problem that can be automated perfectly fine, but when you get to through-hole almost nobody does it, because (a) the THT capable pick and place machines are uncummon and thus somewha
262.
by dfox 3y ago
One thing to note is that usually most of the door itself is usually manufactured by some external supplier and the parallel assembly line in the final assembly only mates a subassembly that contains all the complexity of the door (interior
263.
by dfox 3y ago
> That's never caused any regulatory problems for Ma Bell Telco lines generally are not considered safe voltage. One thing is that ringing voltage is fairly squarely above the threshold and another thing is the whole outside plant t
264.
by dfox 3y ago
Note that the article glances over the first byte of image data which specifies how many bits each pixel occupies and sets it 07, which makes first 128 symbols of the resulting LZW stream byte aligned. This is probably never the case in pra
265.
by dfox 3y ago
Tor works on the level of circuits and from the inside of the circuit has nothing to do with IP. The exit node is the first node where that is converted to an actual TCP connection. This among other things means that the only protocol on th
266.
by dfox 3y ago
There are multiple motivations and resulting technologies there: - “L3 Switches”, which in essence are routers that do not have discrete ports and instead have closely coupled switch. Alternatively the same thing can be viewed as switch wit
267.
by dfox 3y ago
I assume that tracert using ICMP is not that much an WinSock limitation but limitation of the underlying NT security architecture without suid binaries, which was worked around with ICMP-only non-privileged “raw sockets”. But that is mostly
268.
by dfox 3y ago
There are various (albeit notionally optional) parts of POSIX that are either not implemented at all or implemented in surprising ways on BSD derived systems. For example, macOS does not implement sem_init() at all, while OpenBSD sem_init(3
269.
by dfox 3y ago
While Linux is not derived from the original Unix codebase it is probably the nearest thing to UNIX in the sense of Single UNIX Specification that you can find.
270.
by dfox 3y ago
Also, it is mostly wrong. The whole /dropper part is the initial loader, which has nothing to do with either hiding the presence or the actual PLC payload. Effectively it is an somewhat obfuscated stub for obfuscated self-extracting ar

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