Первый микропроцессор (МП) с условным обозначением I4004. Микропроцессорные комплекты БИС, страница 17

                    1                    &                                                                                &

 Вх                                                                                                                                      

                                                                 Т7                                                                               T8

Запись                             D2                                                                             D3 

1

       

 

В ДОЗУ ячейка памяти может быть реализована:

 

 АШ                                    ДШ                                                                                                                ДШ

                                                                     АШ                                                               Т3

                                                                                                                       Т2                

                                             +                                                                               

                                                                                                                                 1

шина "1"

                                                                 1                   - паразитная емкость  на одном транзисторе                                        на трех транзисторах

ЛЕКЦИЯ   9

1.17.2  Способ  наращивания информационной емкости                                 

В различных МП системах требуются различные  емкости  памяти.  Чтобы     обеспечить требуемую емкость из стандартных БИС ЗУ используют  горизонтальный способ наращивания емкости памяти, вертикальный и комбинированный.  Горизонтальный - повышение  разрядности  информационного слова.                                                                                                                   

 

    8080/86          16                                                                                                            AB

                                                              D1                                                      D8

МП                         16       A0                    1                     16       A0                   1            16 

                                                    :        64K     I/O                                 :                    I/O                               I/O

                                                    :         *1                                           A14

                                                 A15                                                     A15

O                                                         O

                                                                                                                                                  DB7        Схема

:                                                                                                                         :          слежения

:                                                                                                                         :         

                                                                                                                                                  DB0         

Вертикальный способ.

 

        8080             8                                                                                                                      AB0 - AB7

                            AB8       8                                                          8

МП              .....