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Step 1 of 2 6.054E Yes, according to Exercise 6.53 it is not always possible to maintain consistency in active-level notation unless you are willing to define alternate logic symbols for MSI parts that can be used in different ways. So encoders can be designed using equations for intermediate variables to detect highest priority asserted input, for is purpose a single GAL20V8 can be used as follows as shown in Figure 1, which gives alternate to 74X148 symbol. Step 2 of 2 The pin diagram of GAL20V8 is shown in Figure 1: CLK/IO VCCC II 1/07 1/06 14 16 GAL20V8 17 V02 18 1/00 GND OE' Figure 1