PowerQUICC™ MPC8313E Reference Design Board (RDB), Rev. 4
42
Freescale Semiconductor
MPC8313E RDB Board Configuration
5.3
Power Supply
The MPC8313E RDB requires a power supply from the ATX power connector. The ATX supply connector
directly provides 12-V, 5-V, and 3.3-V voltages. Core voltage, DDR2 voltage, RGMII voltage, and
PHY-specific voltages are provided by either switching or linear regulated depending on the voltage drop
and current consumption requirement. MPC8313E power-down mode is supported. A regulator that can
be shut down is implemented for this purpose.
The MPC8313E does not require the core 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 21
shows the power supply table.
19-21
TSEC2M
TSEC2 Mode
000
MII mode
001
RMII mode
011:Default
RGMII mode
101
RTBI mode
110
SGMII mode
010,100,111
Reserved
22-27
Reserved
—
Must be cleared
28
TLE
True little endian
0: Default
Big-endian mode
1
True little endian mode
29
LALE
Local Bus ALE
signal timing
0: Default
Normal LALE timing
1
LALE is negated 1/2 lbc_controller_clk earlier.
30-31
Reserved
—
Must be cleared
Table 21. Power Supply Usage Summary
Voltage
Usage
Budget
Solution
1 V shutdownable
VDD, AVDD1
<1 A
MIC regulator (3 A) with tracking
1 V
VDDC
<10 A
MIC switching
1.2 V
VSC7385, 88E1111
1.75 A + 0.4 A
MIC37302 LDO (3 A)
1.8 V
DDR2
0.5 A + DDR chip x2pcs
MIC37302 LDO (3 A)
2.5 V
RGMII
0.2 A + 0.2 A + 0.2 A
MIC39100-2.5WS (1 A)
3.3 V
General IO
Variable
Direct from ATX Power
Table 20. Reset Configuration Word High (RCWH) Bit Descriptions (continued)
Bits
Name
Meaning
Description
