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Spectrum Digital, Inc
Shown below is a break out of the memory spaces.
Address
Memory Space
0x02000000
NAND Chip Select 0
0x02004000
NAND Chip Select 1
0x04014000
DM9000A ENET Controller
Figure 1-4, DM355 EVM Chip Enable Memory Space
1.5 Configuration Switch Settings
The EVM has a configuration switch that allow users to control the operational
state of the processor when it is released from reset and determine the source for
processor booting. Switch SW7 configures the boot mode that will be used when the
DSP starts executing. By default the switches are configured to NAND Flash boot.
The EMIF configuration switch must be set accordingly.
Table 1: SW7, Boot Mode Select
Pos 2
ON
ON
OFF
OFF
Pos 1
ON
OFF
ON
OFF
Boot Pin
BTSEL1/BTSEL0
0 0
0 1
1 0
1 1
Function
NAND boot CE0 *
Not Supported
Boot from SD/MMC
Boot from UART
* Default Setting
1.6 Power Supply
The EVM operates from a single +5V external power supply connected to the main
power input (J14), a 2.5 MM. barrel-type plug. Internally, the +5V input is converted
into +1.2V, +1.8V and +3.3V using Texas Instruments swift voltage regulators. The
+1.3V supply is used for the DSP core while the +3.3V supply is used for the DSP's I/O
buffers and other chips on the board. The +1.8 volt supply is used for DM355 DDR2
memory.
1-6
DM355 EVM Technical Reference
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