Specifications

Little Board/P5i Technical Manual
2–30
2.10.5 Using Flash EPROMs
Flash programming power for +12V Flash devices is provided by an on-board power supply. You do not
need to connect an external +12V power supply to program Flash devices. Programming power is
switched under software control so that it is applied only during the actual programming process (to
prevent accidental corruption of the data). A utility for programming supported Flash devices is included
on the utility disk that is provided with the Little Board/P5i Development Kit.
Some Flash EPROMs draw current through their chip select lines (or other pins) when powered down. If
you install a Flash EPROM in socket S0, and you have a backup battery connected to J16, make sure the
jumper on W2 is removed and the jumper on W21 is on 1/2 to prevent premature discharge of the battery.
Table 2–22 Flash EPROM Jumpering for S0
Flash EPROM
Typical Devices Pins Jumper Diagram
32K 5V Flash EPROM 29C256 28
32K 5V Flash EPROM 28C256 28
64K 5V Flash EPROM 29F512
128K 5V Flash EPROM 29F010
256K 5V Flash EPROM 29F020
512K 5V Flash EPROM 29F040
32
32K 12V Flash EPROM 28F256
64K 12V Flash EPROM 28F512
128K 12V Flash EPROM 28F010
256K 12V Flash EPROM 28F020
32