# # Rcsid[] = "$Id: vector.mss,v 2.1 1993/10/06 01:01:38 alex Exp $"; # .vec file The .vec file for the gl85 circuit contains 1's and 0's as stimuli input to the circuit. Since there are no bidirectional I/O pins in this circuit, no other stimuli are required. In general, when a circuit has bidirectional I/O pins, it would be necessary to specify floating values (for example, z's) as inputs. Double dashes "--" indicate that all text up to the end of the line is comment. The first few lines of the file serve as a header. This is optional but quite helpful in identifying the order of the inputs when examining the vector file. Blanks are ignored by the vector reader but they can be very helpful in improving readability. Columns 1&2 are blank in order to line up the stimuli with the information in the header. In the gl85 model, blanks are used to demarc the data field D7 to D0. Since the header is merely comment, and those lines are totally ignored by the vector reader, the user may want to cut and paste the header at strategic points in the vector file when writing new test vectors to add to the vector file. In fact, a new vector file, header and all, can simply be appended to an existing vector file. Consider the following: --CNR --LEE --KTS -- 1E -- T -- 000 -- RESET the circuit 001 -- reset input made inactive -- Now begin functional program 101 -- create up-edge on clock input -- --CNR --LEE --KTS -- 1E -- T -- 001 011 -- Net1 changed to 1 111 -- Another up-edge The total test program is six vectors in length. The header, consisting of the first six lines, appears twice. The vectors are annotated with comments to indicate their purpose. For the gl8085, the design verification vectors have been annotated, in particular the beginning of a sequence is usually indicated. This is important because it requires anywhere from eight to 36 vectors to fully implement a single instruction. For instance, a MOV register-to-register instruction has one M-cycle and four T-states. Each T-state requires two vectors to generate a clock edge. Hence, the four states require eight vectors. <div align="center"><br /><script type="text/javascript"><!-- google_ad_client = "pub-7293844627074885"; //468x60, Created at 07. 11. 25 google_ad_slot = "8619794253"; google_ad_width = 468; google_ad_height = 60; //--></script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script><br /> </div>