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+--- Thread: Shift Register Help (/thread-1483.html)
Shift Register Help - Kernul_Sanders - 12-04-2013
Where are shift registers hooked up to ALUs? If there are multiple possible spots, then what is the best one?
RE: Shift Register Help - EDevil - 12-04-2013
At the end of the ALU
RE: Shift Register Help - Guy1234567890 - 12-04-2013
I personally recommend not using a shift register, and instead using a bit shifter (same thing minus the memory)
RE: Shift Register Help - EDevil - 12-04-2013
ow yeah, definitely that ^ (didnt pay that much attention with my first post). Also, one thing to note is you really only need a right shifter, since left shifting can be done easily adding 2 numbers together. Example; 4 + 4 =8 (0100 + 0100 = 1000) <- Bit just shifted 1 position to the left. This can be done extremely easy by using dual read registers.
RE: Shift Register Help - Guy1234567890 - 12-04-2013
^ Indeed
RE: Shift Register Help - Kernul_Sanders - 12-04-2013
Ah, okay thanks. I'll stick with the bi directional bit shifter I have, it's 2x3x8 per bit, I'm sure I can compact it though.
Unless someone can show me how to do what evil explained.
RE: Shift Register Help - Guy1234567890 - 12-05-2013
I can if i'm ever on the same time as you XD
RE: Shift Register Help - greatgamer34 - 12-11-2013
Barrel shifters are quite nice because they don't save data they can shift it as many time as you want! I have a bi-directional barrel shifter designed for my cle alu CPU. It was made by lorddecapo. /warp computerplot and go to the floating CPU that is color coded. The purple thing is the barrel shifter. Red is up. Black is down. Can shift up to 7 times.
RE: Shift Register Help - EDevil - 12-11-2013
The reason why barrel shifters are stupid is because their simply unnecessary. I presume you are going to hook that thing up to your IS, Clock etc. So with each clock cycle, you can shift all of your bits to the left / right. Okay, cool. Which program did you ever encounter that you needed to shift 5 bits to the left? At least i haven't seen something like that. And if i do need to somehow shift my bits 2 positions to the left, i'll just use my shift command twice. I find that more effectively than slowing down your ALU, and having that much extra space taken by a device that will probably never shift more than 1 time.
RE: Shift Register Help - greatgamer34 - 12-14-2013
Im going to use it in my multiplication program to cut the program size down.
RE: Shift Register Help - EDevil - 12-14-2013
Legit answer
In that case, it would be nice(12-14-2013, 08:19 PM)greatgamer34 Wrote: Im going to use it in my multiplication program to cut the program size down.
RE: Shift Register Help - greatgamer34 - 12-15-2013
It should be really nice haha