This can be very useful if the main one is connected in a wired-OR line. The blocks in SC allow up to 5 connections so for these gates a second, independent output is provided. In many cases this can eliminate the need for an output enable buffer.Īll the basic gates use only 2 or 3 I/O ports. There is no fan-out or fan-in limit or degradation since this is a virtual environment. See this article for more information.Īll outputs may be wired together to provide an implicit OR function amongst them.
I call it a "half-hex" because it can be thought of as a light value added to the hex '8' (the minimum value that triggers a binary input).Īnother hybrid is the Memory Bank's clock input. The LED uses a "half-hex" signal where any value below '8' does nothing and '8' to 'F' control the lighting amount. The system also uses partial-hex-type signals. They are not analog by any means except as a false concept to make it easier (?) for some to understand. Hereinafter, I will call these 'hex' signals and 'hex' inputs, etc. A few gates take further advantage of the 16-value 'analog' signal. Any gate that requires a binary only input effectively only looks at the high bit since any 'voltage' of 0.8 or above will trigger it. It is often referred to in volts, from 0.0 to 1.7, in the SC system documentation. Most of the gates will operate on this 4-bit signal, giving a 4-bit output. This hex signal may be passed along a single wire but represents a 4-bit data value.
One of the most powerful factors in SCE is the hex signal. There are several features of the electrics system that are useful to the design of complicated circuitry.