74LS688 DATASHEET PDF

Tujas I got lost reading that. Datashewt the address lines transition and settle out, they might very well set up a glitch that agrees with the test condition, well before you intended. You could then use it as a clock. In other words, what function does it serve? Just to scratch my own curious itch, what does the connect to? This is all fine.

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Tujas I got lost reading that. Datashewt the address lines transition and settle out, they might very well set up a glitch that agrees with the test condition, well before you intended. You could then use it as a clock. In other words, what function does it serve? Just to scratch my own curious itch, what does the connect to? This is all fine. This might cause a false trigger if your address trap was at B.

It may even make it worse. Any decoder, like the will create big nasty full swing glitches that can only be removed with the proper clocked gating or latching. It is a glitchy signal. This would also add about 62 nS to your latch clock which right now is only 3 gate delays long and would be difficult to see on an old low bandwidth scope.

A way to avoid that would be to de-glitch the circuit by adding a synchronizing flip-flop running at 16MHz just before the latching flip-flop. There may be better ways to do this job so keep tinkering. Note that this would take away 62 nS from the access time of the first instruction fetch after the proper address compare, but it should be OK if you are using newer memory devices.

For example, going from 9 to A might give a false compare of B for a few nanoseconds. Related Posts

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74LS688 DATASHEET PDF

A way to avoid that would be to de-glitch the circuit by adding a synchronizing flip-flop running at 16MHz just before the latching flip-flop. Note that this would take away 62 nS from the access time of the first instruction fetch after the proper address compare, but it should be OK if you are using newer memory devices. If you expect to use it, you need to turn the enable off during the time when the compare inputs are in transition. It may even make it worse. Just to scratch my own curious itch, what does the connect to? This would also add about 62 nS to your latch clock which right now is only 3 gate delays long and would be difficult to see on an old low bandwidth scope.

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Makora This would also add about 62 nS to your latch clock which right now is only 3 gate delays long and would be difficult to see on an old low bandwidth scope. You could then use it as a clock. I dqtasheet do well with word descriptions of circuits—can you draw a schematic? A way to avoid that would be to de-glitch the circuit by adding a synchronizing flip-flop running datasheer 16MHz just before the latching flip-flop. This is all fine. Note that this would take away 62 nS from the access time of the first instruction fetch after the proper address compare, but it should be OK if you are using newer memory devices. Any decoder, like the will create big nasty full swing glitches that can only be removed with the proper clocked gating or latching.

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