The Memory Controller keeps the SDRAM in this periodical power-down/refresh/
power-down sequence until it is commanded to exit power-down mode by
MEMSCTRL.PWDM = 0.
When a read/write request to the SDRAM occurs while the SDRAM is in power-
down mode, the Memory Controller brings the SDRAM out of power-down mode
and issues the read/write access to the SDRAM. The Memory Controller then puts
the SDRAM back to power-down mode after completion of the read/write access.
External Memory Interface Controller
Chapter 9
Preliminary User's Manual S19203EE1V3UM00
313
Содержание uPD72257
Страница 39: ...Pin Functions Chapter 2 Preliminary User s Manual S19203EE1V3UM00 39...
Страница 44: ...Chapter 2 Pin Functions 44 Preliminary User s Manual S19203EE1V3UM00...
Страница 46: ...Chapter 2 Pin Functions 46 Preliminary User s Manual S19203EE1V3UM00...
Страница 49: ...Pin Functions Chapter 2 Preliminary User s Manual S19203EE1V3UM00 49...
Страница 52: ...Chapter 2 Pin Functions 52 Preliminary User s Manual S19203EE1V3UM00...
Страница 54: ...Chapter 2 Pin Functions 54 Preliminary User s Manual S19203EE1V3UM00...
Страница 331: ...External Memory Interface Controller Chapter 9 Preliminary User s Manual S19203EE1V3UM00 331...
Страница 343: ......