Ampro Corporation 486E Using SRAMs, Non-volatile RAM

Little Board™/486e Technical Manual
2–54
Using SRAMs
The external battery power is combined wi th the in tern al ba ttery u sing low for ward v ol tage dr op
Schottky diodes. Table 2–41 lists the SRAM and NOVRAM jumpering for S0.
Table 2–41. SRAM and NOVRAM Jumpering for S0
SRAM
Typical Devices Pins Jumper Diagram
128K SRAM - 628128
512K SRAM - 628512 32
1
3
79
Non-volatile RAM
Non-volatile RAM can be used as a means of dramatical ly sto ring and retrie ving run time
application data. NOVRAM has the following spec ificatio ns:
! 32 pin
! 128K bytes maximum in segments D0000 and E 0000
! Must be programmed in place on the Little Board/486e CPU
! NOVRAM offers some advantages over Flash EPROM including faster access speeds and
unlimited write operations.