logic analyser part 2

4-22 — elektor april 1981 logic analyser II logfr Last month, the basic principles of the logic analyser were explained with the aid of block diagrams. Now the moment has arrived to see what the actual circuit diagrams look like. Again, the unit has been split up into two sections: the logic analyser itself and the cursor circuit. This makel it easier to "place" the various parts previously shown in the block. diagrams. L11by 1C4 and 105. Together they consti- tute the 8 bit counter A shown in the block diagram. This counter continually scans all the addresses in the memory, as its clock inputs receive the sampling or Table 1 Sampling rates S1 1 250 ns 500 ns 500 ns 5μs 25 μs 50μs 250 μs 500 μ 2.5 ms EXT S2 circuit boards and the constructional details will be dealt with next month. The circuits are more than enough for now. The logic analyser circuit diagram For a change, we"II start in the middle of figure 1 (that is, the lower left- hand corner, to be precise) — at the...