Question 11.27: Assume that we need an 8031 system with 16KB of program spac...
Assume that we need an 8031 system with 16KB of program space, 16KB of data ROM starting at 0000, and 16K of NV-RAM starting at 8000H. Show the design using a 74LS138 for the address decoder.
The solution is diagrammed in Figure 14-17. Notice that there is no need for a decoder for program ROM, but we need a 74LS138 decoder
For data ROM and RAM. Also notice that G1 = V_{cc}, G2A = GND,
G2B = GND, and the C input of the 74LS138 is also grounded since we Use Y0 – Y3 only.
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