??? 06/21/05 20:53 Read: times |
#95527 - 7 or 9 value logic Responding to: ???'s previous message |
This is why there are 7 or 9 possible logic states in formal logic simulator tools which are :0,1,L,H called forcing and weak values
U,W,X,- Metalogical values and Z Tristate and all of these are used to determine the state of signals in busses or where there are two or more drivers on a signal using what is known as unresolved logic. So the value where an input falls between the high input and the low inout threshold would be a U state and there are rules called resolution functions which tell the simulator what the result of an U input is when it meets any other state. |