Programming considerations Hard reset
Digi Connect ME, Wi-ME, ME 9210, Wi-ME 9210 Hardware Reference Manual
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LED Description
Green This software-programmable LED is wired to processor GPIO register
bit C6/GPIO[14] and is wired to be lit when low. The default behavior is
to blink on Ethernet activity.
Hard reset
The embedded modules support a hardware reset on pin 14 of the 20-pin header. Pulling pin 14 low
with an open drain driver will force the module into a hard reset state. The module will remain in the
reset state as long and pin 14 is held low and will leave this reset state ~250mS after pin 14 goes high.
Do not actively drive pin 14 high and do not allow the rise time of the pin 14 to be longer than 100uS.
When used with the development board, this pin is wired to reset button SW4, which means it acts as
a hard reset button.
Memory
The Digi Connect ME has the following types of memory.
Flash
The Digi Connect ME has 2 or 4 MB of flash memory. The Digi Connect Wi-ME has 4 MB or 8 MB of flash
memory.
On the Digi Connect ME/ARM7 family, the flash memory is controlled by chip select 0, located at
0x02000000.
On the Digi Connect ME 9210/ARM9 family, the flash memory is controlled by chip select 2 (default=st_
cs1) and is located at 0x50000000.
SDRAM
The Digi Connect ME and the Digi Connect Wi-ME’s SDRAM is controlled by chip select 1 and is located
at 0x00000000.
The Digi Connect ME 9210’s SDRAM is controlled by chip select 1 (default = dy_cs0) and is mapped to
0x00000000.
The embedded modules have 8 MB of SDRAM memory.
The following table illustrates typical power consumptions using these power management
mechanisms. These measurements were taken with all Digi NS9210 processor’s I/O clocks disabled
except UART A, UART C, Ethernet MAC, I/O Hub and Memory Clock0 with the ethernet connected to a
100Mb network, using a standard module plugged into a Digi JumpStart Kit development board, with
nominal voltage applied:
Mode
Power Consumption
1
Normal Operational
Mode
2
1.14W (346mA)
Full Clock Scaling Mode
3
.613W (186mA)
Sleep Mode
4
.113W (34mA)
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