Electronic Engineering help Can someone please help me? I need to program a 74LS

Question

Electronic Engineering help

Can someone please help me?

I need to program a 74LS190 chip in hex to count down.

I was able to use a CMOS4516 to accomplish a count up and count down, but I am just not grasping how to code this 74LS190.

I have tried manipulating the circuit in multisim several different ways and the only way I can get it to count down is if I jam the numbers on the P3-P0 inputs; however, this is incorrect and not using the counter.

Chip inputs

~CTEN

~LOAD

~U/D

P0

P1

P2

P3

any help would be awesome I have been stuck on this for days

Explanation / Answer

so the display would read
"0"
"F"
"E"
"D"
"C"
"B"
"A"
"9"
"8"
"7"
and so forth.

but my issue is understanding the Hexadecimal code required to input into my word generator.
I get that in order to count down a logic high needs to be on the ~U/D but other than jamming my inputs onto P0-P3 I can't get it to work.

I should be able to put in a certain hex value into my word generator without placing any inputs onto the P0-P3 to enable the count down sequence, but it just isn't apparent as to what I need to plug into the word generator.

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