16. Fine tions. (a) 16Kx8 ROM (c) 64Kx8 SRAM (e) 64Kx8 ROM (g) IMx8 SRAM (i) 64Kx8 NV-RAM A0-A7, D0-D7 0-A10, D0-D7 I data pins for the following memory organiza (b) 32Kx8 ROM (d) 256Kx8 EEPROM (f) 64Kx4 DRAM (h) 4Mx4 DRAM 18. For each of the following sets of data (the last byte is the checksum byte) ver- 17. Find the checksum byte for these bytes: 34H, 54H, 7FH, 11H, E6H, 99H ify if the data is corrupted. (a) 29H, ICH, 16H, 38H, and 6DH (b) 29H, ICH, 16H, 30H, and 6DH SECTION 14.2: MEMORY ADDRESS DECODING 19. Find the address range of the memory | design in the diagram. 20. Using NAND gates and inverters, design decoding circuitry for the address range 2000H 2FFFH. 21. Find the address range for YO, Y3, and Y6 A14. of the 74LS138 for the diagrammed A15- design. D7-DO AD AD A13 22. Using the 74138, design the memory Diagram for Problem 19 decoding circuitry in which the memory block controlled by YO is in the range 0000H to | 1FFFH. Indicate the size of the memory block con- trolled by each Y. 23. Find the address range for Y3, Y6, and Y7 in Problem 22. 74LS138 A12-A GND A13-B A14 C G2A - G2B G1 Diagram for Problem 21 24. Using the 74138, design memory decoding circuitry in GND which the memory block controlled by Y0 is in the A15- 0000H to 3FFFH space. Indicate the size of the mem- ory block controlled by each Y. 25. Find the address range for Y1, Y2, and Y3 in Problem 24. SECTION 14.3: 8031/51 INTERFACING WITH EXTERNAL ROM 26. In a certain 8031 system, the starting address is 0000H and it has only 16K bytes of program memory. What is the ending address of this system? MEMORY 445