Change the program stored in the ROM of Problem 12-18 to generate the D₇ waveform of Figure 12-44.

Figure 12-44.

Data from Problem 12-8

Another ROM application is the generation of timing and control signals. Figure 12-43 shows a 16 × 8 ROM with its address inputs driven by a MOD-16 counter so that the ROM addresses are incremented with each input pulse. Assume that the ROM is programmed as in Figure 12-6, and sketch the waveforms at each ROM output as the pulses are applied. Ignore ROM delay times. Assume that the counter starts at 0000.

Figure 12-43

Figure 12-6

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D₂ 几 F|||||||||||||||| 104S