Could some electronics guru please provide some ideas/hints to my problem. I am trying to implement a parallel in serial out shift register, and having problems with implementing the serial read out part. Consider a four bit parallel in serial out shift register, and let the following word be stored 1 1 0 1. At read out time, at the end of the first clock period, 1 should appear at the output, followed by 0 at the end of the second clock period and so on. My question is how do I generate the sequencing pulses to achieve the shift. I have experimented with a barrel shifter, but have not been very successful. Any hints/ideas would be valuable. Thanks in advance for your help.
Parallel in - Serial out shift register
Oct 11, 2010
5 Replies
Well, you load it in with the parallel load enable, and clock it out with the shift clock.
Good Luck! Rich
Look up the 74165.
G=B2
On a sunny day (Sun, 10 Oct 2010 20:27:16 -0700 (PDT)) it happened Daku wrote in :
I think you can use some D flopflips and clock everything at the same time. if those have a set-reset input you can parallel load the chain.
74[[HC]T]74, 2 in a package.
No, the serial output will go high as soon as 1101 is loaded into the
device.
Dig out the schematic of the "classical" Parallel in - Serial out shift register (TI as made at least a dozen (million) of them..
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