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Chapter 11_2 (10_2 edition 8) Sequential Circuits etc.

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Presentation on theme: "Chapter 11_2 (10_2 edition 8) Sequential Circuits etc."— Presentation transcript:

1 Chapter 11_2 (10_2 edition 8) Sequential Circuits etc.

2 Read-Only Memory (ROM) Memory that is implemented with combinational circuits – Combinational circuits are often referred to as “memoryless” circuits because their output depends only on their current input and no history of prior inputs is retained

3 Read-Only Memory (ROM) Memory unit that performs only the read operation – Binary information stored in a ROM is permanent and is created during the fabrication process – A given input to the ROM (address lines) always produces the same output (data lines) – Because the outputs are a function only of the present inputs, ROM is a combinational circuit

4 Sequential Circuit Current output depends not only on the current input, but also on the past history of inputs Makes use of combinational circuits SequentialCircuit

5 Sequential circuits The flip-flop is a bi-stable device. It exists of two states and in the absence of input, remains in that state. Thus the flip-flop can function as a 1-bit memory. The flip-flop has two outputs, which are always complements of each other. These are generally labelled as Q and Q

6 The S-R Latch

7 SR Characteristic table

8 + NOR S-R Latch Timing Diagram

9 Clocked S-R Flip-flop

10 D-Flip-flop

11 J-K Flip Flop


13 8-Bit parallel register

14 5-Bit shift register

15 Counters Counters are asynchronous or synchronous Asynchronous slow output of one flip-flop triggers change of status in next flip-flop Synchronous all flip-flops change state at same time faster – used in CPUs





20 Irvine, Kip R. Assembly Language for Intel-Based Computers, 2003. 20 Printing this Slide Show To print this slide show with black characters on a white background, do the following: Select Print... from the File menu. Select Handouts in the Print what drop-down box. Select 2 or 3 in the Slides per page drop-down box. Select the Pure black and white check box (optional) Click on OK to begin printing. Back to the title page

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