Q2. (a) Figure 2 shows the pinout diagram (and their functional description) of the 2114 Static RAM memory IC. Using a neat sketch show how such IC may be interfaced with an M68000 microprocessor to realise a system that needs 1K x 16 bits of RAM. [Note: 2114 is a 4-bit memory IC. You will need multiple ICs to make up the 16-bit address bus of M68000 processor.] Ao-Ag Pin Names Address Inputs A6 1 A5 2 A4 AO 5 A16 A2 7 CS 8 GND 9 -23456782 18 Vcc WE Write Enable 17 A7 CS Chip Select 16 A8 1/0₁-1/04 Data Input/Output A3 4 15 A9 VCC Power (+5V) GND Ground 14 I/O 1 13 I/O 2 Truth Table 12 1/03 CS WE Comments 11 I/O 4 H X Chip Deselected L L Write 10 WE L H Read Figure 2 (b) Design an address decoder circuit to realise the following memory map (shown below in hexadecimal notation). The unused address range should generate an active low signal to be connected to the BERR* input of the M68000 microprocessor. Use the partial address decoding technique for your design. ROM1 00 0000 03 FFFF ROM2 04 0000 07 FFFF unused 08 0000 3F FFFF RAM 40 0000-7F FFFF. [ You only need to show the Truth Table and the corresponding logic equations for the decoder circuit. No need to draw the decoder circuit.]
Q2. (a) Figure 2 shows the pinout diagram (and their functional description) of the 2114 Static RAM memory IC. Using a neat sketch show how such IC may be interfaced with an M68000 microprocessor to realise a system that needs 1K x 16 bits of RAM. [Note: 2114 is a 4-bit memory IC. You will need multiple ICs to make up the 16-bit address bus of M68000 processor.] Ao-Ag Pin Names Address Inputs A6 1 A5 2 A4 AO 5 A16 A2 7 CS 8 GND 9 -23456782 18 Vcc WE Write Enable 17 A7 CS Chip Select 16 A8 1/0₁-1/04 Data Input/Output A3 4 15 A9 VCC Power (+5V) GND Ground 14 I/O 1 13 I/O 2 Truth Table 12 1/03 CS WE Comments 11 I/O 4 H X Chip Deselected L L Write 10 WE L H Read Figure 2 (b) Design an address decoder circuit to realise the following memory map (shown below in hexadecimal notation). The unused address range should generate an active low signal to be connected to the BERR* input of the M68000 microprocessor. Use the partial address decoding technique for your design. ROM1 00 0000 03 FFFF ROM2 04 0000 07 FFFF unused 08 0000 3F FFFF RAM 40 0000-7F FFFF. [ You only need to show the Truth Table and the corresponding logic equations for the decoder circuit. No need to draw the decoder circuit.]
Chapter22: Sequence Control
Section: Chapter Questions
Problem 6SQ: Draw a symbol for a solid-state logic element AND.
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