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Net names starting with a slash

Axel Rau All Messages By This Member #23328 What means the slash in /SDA ? There exists also a net called SDA. Are the slash variants related to the parent sheet of my flat hierarchy? Axel --- PGP-Key: CDE74120 ? computing @ chaos claudius
Kaspar Bumke All Messages By This Member #23329 I believe it indicates that the signal is inverted. toggle quoted message Show quoted text On Fri, 1 Jul 2022 at 18:35, Axel Rau <Axel.Rau@...> wrote: What means the slash in /SDA ? There exists also a net called SDA. Are the slash variants related to the parent sheet of my flat hierarchy? Axel --- PGP-Key: CDE74120? ?? computing @ chaos claudius
Tony Casey All Messages By This Member #23330 On Sat, 2022-07-02 at 14:38 +0100, Kaspar Bumke wrote: I believe it indicates that the signal is inverted. On Fri, 1 Jul 2022 at 18:35, Axel Rau <Axel.Rau@...> wrote: What means the slash in /SDA ? There exists also a net called SDA. Are the slash variants related to the parent sheet of my flat hierarchy? Axel --- PGP-Key: CDE74120? ?? computing @ chaos claudius No, that requires a tilde (~). This is kinda logical, as it is commonly the bitwise complement operator in many programming languages. -- Regards, Tony
brian All Messages By This Member #23331 It is/was standard practice in industry to use / to show an active low signal. This is from before the days of CAD systems capable of rendering an overbar, which is what the tilde does. toggle quoted message Show quoted text On Sat., Jul. 2, 2022, 10:45 Tony Casey, <tony@...> wrote: On Sat, 2022-07-02 at 14:38 +0100, Kaspar Bumke wrote: I believe it indicates that the signal is inverted. On Fri, 1 Jul 2022 at 18:35, Axel Rau <Axel.Rau@...> wrote: What means the slash in /SDA ? There exists also a net called SDA. Are the slash variants related to the parent sheet of my flat hierarchy? Axel --- PGP-Key: CDE74120? ?? computing @ chaos claudius No, that requires a tilde (~). This is kinda logical, as it is commonly the bitwise complement operator in many programming languages. -- Regards, Tony
Tony Casey All Messages By This Member #23332 On Sat, 2022-07-02 at 11:11 -0400, brian wrote: It is/was standard practice in industry to use / to show an active low signal. This is from before the days of CAD systems capable of rendering an overbar, which is what the tilde does. Yes, I remember. It was common, but not universal. I've worked in many different companies that used various other conventions: lower case "m" or "n" prefixes with all upper case NETNAMES, negation sign (minus). Protel (which I still use), for example, uses backslashes (which are rendered as overbar). These days, underscore is often used, which usually is rendered as overbar. -- Regards, Tony

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