User`s manual

34 RabbitLink (EG2110)
C.3 Memory
The RabbitLink has SRAM and flash memory devices. The Dynamic C BIOS handles dif-
ferent standard RAM and flash memory sizes automatically.
C.3.1 SRAM
The RabbitLink is designed to accept 128K or 512K of SRAM packaged in an SOIC case.
It comes standard with 128K of SRAM. Figure C-3 shows the locations and the jumper
settings for the jumpers at JP4 used to set the SRAM size. The jumpers are 0 Ω surface-
mount resistors.
Figure C-3. RabbitLink Jumper Settings for SRAM and Flash EPROM Size
C.3.2 Flash EPROM
The RabbitLink is designed to accept 128K to 512K of flash memory packaged in a TSOP
case. It comes with two 256K flash memories, one for the firmware and one for data.
Figure C-3 shows the locations and the jumper settings for the jumpers at JP2 and JP3
used to set the flash memory size. The “jumpers” are 0 Ω surface-mounted resistors.
NOTE: Rabbit Semiconductor recommends that any customer applications should not be
constrained by the sector size of the flash EPROM since it may be necessary to change
the sector size in the future.
SRAM
128K
512K
3
2
1
JP4
FD
JP4
SRAM
3
2
1
JP3
JP3
128K/256K
512K
Flash Memory
FD
JP2
JP2
128K/256K
512K
Flash Memory
FD
3
2
1
3
2
1
3
2
1
3
2
1
FD
Factory
Default
Flash
EPROM
Flash
EPROM