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Getting Started
supply voltage and IO supply voltages to be applied in any particular order. However, during the power
ramp up, before the power supplies are stable, there may be an interval when the IO pins are actively
driven. After the power is stable, as long as PORESET is asserted, most IO pins are three-stated. To
minimize the time that IO pins are actively driven, apply core voltage before IO voltage and assert
PORESET before the power supplies fully ramp up.
Table 10. Power Supply Usage Summary
Voltage
1V
1.2V
1.5V
1.5V
1.8V
2.5V
3.3V
5V
12V
Usage
Vcore
VSC7385 core
RTL8211B
mini PCIe connector
DDR2, RTL8211B
VSC7385 IO
General IO
Switching power
external 12V supply of mini
Budget
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
Solution
MIC1954EUB+ switching
MIC37302 LDO (3A)
NCP 1117SRAR3G LDO (1A)
NCP 1117SRAR3G LDO (1A)
MIC37302 LDO (3A)
NCP 1117SRAR3G LDO (1A)
MIC1954EUB+ switching
Direct from Power Jack
Direct from Power Jack
PCIe adaptor
4.3
Chip-Select Assignments and Memory Map -TBD
Table 11 shows an example memory map on the MPC8308_RDB for u-boot in NOR flash memory.
Table 11. Example Memory Map, Local Access Window, and Chip-Select Assignments
Address Range
0x0000_0000–0x07FF_FFFF
0xE000_0000–0xE00F_FFFF
0xE280_0000–0xE280_7FFF
0xF000_0000–0xF001_FFFF
0xFE00_0000–0xFE7F_FFFF
Target Interface
DDR2
Internal bus
NAND Controller
Local bus
Local bus
Chip-Select
Line
MCS0#
Nil
LCS1#
LCS2#
LCS0#
Device Name
DDR SDRAM (128 Mbyte)
IMMR (1 Mbyte)
NAND Flash window (32Kbyte)
VSC7385 (128Kbyte)
Boot Flash (8 Mbyte)
Port Size (Bits)
32
—
8
8
16
5
Getting Started
This section describes how to boot the MPC8308_RDB. The on-board flash memory is preloaded with a
flash image from the factory. Before powering up the board, verify that all the on-board DIP switches and
jumpers are set to the factory defaults according to the settings listed in Section 5.1, “Board Jumper
Settings,” and make all external connections as described in Section 5.2, “External Cable Connections.”
PowerQUICC? MPC8308_RDB User’s Guide, Rev. 3
30
Micetek International Inc.
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