An extremely important principle of troubleshooting, called divide-and conquer, was introduced. It is really not about military strategy, but rather describes the most efficient way to eliminate from consideration all the parts of the circuit that are working correctly. Assume that data have been loaded into the four transmit registers of Figure 9-32 and the transmit pulse has occurred, but after the next 16 clock pulses, no new data have appeared in the receive registers shown in Figure 9-33. How can we most efficiently find the problem?

Figure 9-32

Figure 9-33

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ld_A id_B ld_C Id_D Clock Transmit PISO registers A₂A₂A₁A₂ BB₂B, B C₂ | C₂ C₁ C₂ D₂ D₂ D₁ D₂ Shift_enable FF2 J 3¹: CLK4 ·lo MUX 1,Four-input multiplexer Z 1₂ la S₁ So Q₁ Q₂. CLK TC MOD-4 EN counter CLR Word counter /sent transmit data Q₁Q0 CLK TC MOD-4 EN counter CLR Bit counter FF1 D CLK CLR 1