74LS, 74LS Datasheet, 74LS 8-bit Serial Shift Register Datasheet, buy 74LS This device is an 8-bit serial shift register which shifts data in the direction of QA toward QH when clocked. Parallel-in access is made available by eight. Texas Instruments 74LS Logic – Shift Registers parts available at DigiKey.
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To perform functional and gate-level 74ls165, the VHDL test benches lstb.
The gate-level simulation uses the output file from the functional simulation as 74ls165 file. The implementation is very simple and a novice VHDL 74ls165 should be able to understand. These setup files are 74ls165 from those of the CMC tutorials as a 74ls165 technology has been used for the example.
The expected outputs are actually generated by the functional simulation. After gate-level simulation, the design can be exported to Cadence to finish the rest of the design flow 74ls165 described in the Design Flow section.
74LS – 8-Bit Shift Register Para In/Ser Out
The rest of this section describes the steps on Figure 5 for the 74LS This can be done with a C program or with a Perl script. To perform functional 74ls165, synthesis, and gate-level simulation with 74ls165 files, the following Synopsys setup files should be used: The functional test 74ls165 are generated with a simple C program lstv.
74ls165 file 74ps165 not only the stimulus, but also the expected responses.
For 74ls615 example, the gate-level simulation output file is to 74ls165 used for the 74ls165 test. To be able to use the test vectors for physical testing, the test vector file needs to be converted to HP PCF format.
However, for a more complicated circuit, the 74ls165 outputs should be generated and used for functional simulation.
The C program prints a set of test vectors to stdout which can be redirected to a text file. The 74ls165 file from the Test Fixturing Software 74ls165 be used to make the jumper connections on 74ls165 test head and 74ls65 connect the timing and pattern pods from the VXI mainframe to the test head.
Both test benches use a similar approach which imports the stimulus test 74ls165 in a file and the simulation results are written 74ls165 an output file.
7ls165 For the 74LS, 74ls165 Perl script topcf. 74ls165 source files are included so that the reader can download the files and try to setup the test on his or her own.
Each line of the file consists 74ls165 one vector of stimulus data that the VHDL test bench reads.
Since this is a very simple circuit, there is no expected output 74ls165 in the test vector generation program.
The test bench uses a clock to output 74ls165 stimulus data in a periodic manner. 74ls165 the CMC 74ls165 tutorial contains a step by step procedure of how to 7l4s165 the Test Fixturing Software, a description will not be given here.
Synopsys is used to synthesize the VHDL code to a gate-level circuit using the Synopsys’ Class library as the target library.
In general, physical testing takes much less time than simulation in 74ls165 so a more exhaustive set 74ls16 74ls165 vectors can be used 74ls165 the physical test. The gate-level simulation test bench compares the expected responses with actual responses from the circuit and outputs error messages if they do not match.