????? ????? ??? ????? ???????

????? ????? ??? ????? ??????? ( ??????????? : programmable read-only memory )? ?? ????? ??????? ??? ?? ?? ???? (PROM) ?? ?????? ??????? ??????? ??????? ??????? ?????? ?????? ???? ???? 1970 ???? ??? ?????? ?? ??????? ????? ??????. ^[1]^[2] ????? ??PROM ???? ?????? AND ????? ??????? OR ????? ??????? ??? ?? ?? ????? ??????:

?????? AND ???? ?? ????????? ??????? ????? ????? 2ⁿ ??????? ?? n ???? ???? ??? ????? ????? (????) ??? ??? ???? ?? (n →2ⁿ) ??????? ?????. ?????? OR ???? ??? ????? ?? ???????? ???????? ??????? ????? ??????????? ?? ?? ????? ???. ??? ????? ???????? ?? ?????? ?????? ?? ?? ???? ???? ?? ???? ???? ????? ?? ???? ??????? ?? ?? ????? ???????? ????????. ??? ?????? ????? ????? ??? ??????? ???? ???? ????? ??????? ???? ????? (pin) ?????? ?????? ????.???? ????? ??????? PROM ?? ????? ??????? ?????? ?????? ?? ?????? ??????? ???????.

????? ??? ??????? ??? ???? ?? ?????? ?????????? ????????? ??? ??? ????? ?????? ?????? ??? ?? ?? ??? ?? ????? ??? ?????? ????????? ???? ???? fuse ??? ??????? ?????? ???? ???? ???? ?????? ??? ??????? ??????? ??????? ??? ???? ?????? ??????? ?????? 1? ???? ?? ?? ??????? ?????? ????? ?????? ????? ???? ?????? 1? ???? ???? ?? ????? ????? ?????? ??????? ??? ?????? ???? ??????? ???? ??????? ??? ?? ????? ???? ???? programmer ????? ???? ?????? ???? ????? ??? ??? ?????? ??????? ????? ?????? ?? 1 ??? ???? ???? ??? ?????? ???? ?????? ???????? ????? ??????? ??? ???? ??????? ?????????? ??? ?????? ???????? ???????? ???? ?????? ????? ?????? ???.

????? ??????? ???????? ???????? ??? ROM [ ??? ]

???? ?? ?????? ??????? ?????? ???? ?? ???? ??????? ?????? ???????? (????) ????? ?? ?????? ??????. ???? ?? ???? ?? ??? PROM ???? ????? ??? ????? ?? ???? ????? ?????? ???? ??? ???? ??????? ??????. ???? ?????? ?????? ??????? ?????? ?? PROM ??? ????? ?? ???? ?????? ?? ?????? ??????? ?? ?????? ???? ?? ?? ??? ??? ???? ?? ???? ????? ?????? ??? ??? ???????? ???????? ?????? ????? ?????? OR ????? (?????) ?????? ?????? ???????? ???????. ?? ???????? ??? ?? ???? ?????? ?????? ?????? ??? ??????? ??? PROM ????? ???? ????? ???????? ?????? ?????? ????? ?????? ??? PROM ??? ?? ?????:

?????? ?????? ?? ??????? ??? PROM ???????? ??????? ???? ?? ???? ??? ???? ????? ????? ??? ???? ?? ???????? ???????? ??? ??? ??? ????? ??????? ????? ???????.

????? ???? ????? ??????? ???????? ???PROM (???? ????? ????? ?????):

f1(A,B,C)=AB+B'C

f2(A,B,C)=(A+B'+C)(A'+B)

f3(A,B,C)=A+BC

????? ???? ?? ???? ??? ????? ????????:

f1(A,B,C)=AB+B'C

=ABC'+ABC+A'B'C+AB'C

= m(1,5,6,7)

?????? ?????? ???????? ??

f2(A,B,C)=(A+B'+C)(A' +B)

=(A+B'+C)(A' +B+C')(A' +B+C)

=M(2,4,5) ?????? ?????? ???????? ??

= m(0,1,3,6,7) ?????? ?????? ???????? ??

f3(A,B,C)=A+BC

=AB'C'+AB'C+ABC'+ABC+A'BC

= m(3,5,6,7) ?????? ?????? ???????? ??

???? ???? ?????? ????? ??? ???????? ???????? ??????? (1,5,6,7) ??????? ?????? ????? ??? ???????? ???????? (0,1,3,6,7) ??? ?????? ?????? ????? ?? (3,4,5,6,7). ?????? ???????? ????? ??????:

??????? ?? PROM ?????? 1 bit ???? ????:

???? ??????? ?????? ?????? ??:

?? ??? ?????? ??? PROM ?????? ?????? ?? ???????? ????????? ?? ?? ??? ?? ?? ?? ???????? ??? ?? ?? ?????:

?? ???????? ?? ??? PROM ??????? ?? ????? ????? ??????? ?? ????? ???? ??????.??? PROM ????? ???? ??? ??????? ???? ????? ??????? ?????? ???????? ??????.

??????? [ ??? ]

^ US Patent 4184207 ???? ?????? 2018-04-27 ?? Wayback Machine - High density floating gate electrically programmable ROM, and US Patent 4151021 - Method of making a high density floating gate electrically programmable ROM ???? ?????? 2015-10-16 ?? Wayback Machine
^ Voir : PROM , sur commentcamarche.net, consulte le 12 decembre 2017 ???? ?????? 2017-12-27 ?? Wayback Machine

?? ????? ??? ?????? ??: ????? ????? ??? ????? ???????

[1] US Patent 4184207 ???? ?????? 2018-04-27 ?? Wayback Machine - High density floating gate electrically programmable ROM, and US Patent 4151021 - Method of making a high density floating gate electrically programmable ROM ???? ?????? 2015-10-16 ?? Wayback Machine

[2] Voir : PROM , sur commentcamarche.net, consulte le 12 decembre 2017 ???? ?????? 2017-12-27 ?? Wayback Machine

[1]

[2]