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Part No.	MPC8378E
Manufacturer	FREESCALE
Size	2Mb
Pages	127 pages
Description	PowerQUICC II Pro Processor Hardware Specifications

Datasheet Summary with AI

1. Processor Overview: MPC8378E

️· This is a PowerQUICC II Pro Processor.
️· It's part of a family of processors with various frequency and voltage options.
️· It’s aimed at applications requiring high performance.

2. Power Sequencing – Critical for Operation

️· Power-Up Sequence: Core voltages (VDD, AVDD) *must* reach 90% of their nominal value *before* the I/O voltages (GV DD, LV DD, and OV DD) reach 10% of their nominal value. PORESET must be asserted before the power supplies fully ramp up. This prevents contention on I/O pins.
️· Power-Down Sequence: The opposite order of power down is required – I/O supplies first, then core and PLL.
️· SerDes power supply (L[1,2]_ _n_ V DD) timing should mirror the core supply (V DD).

3. Power Supply Specifications:

️· Core Voltage (VDD): 1.0 V ± 100mV up to 667 MHz, 1.05 V ± 100mV at 800 MHz.
️· PLL Voltage (AVDD): Same as VDD.
️· DDR I/O Voltage (GVDD): 2.5V ± 125mV or 1.8V ± 90mV.
️· Three-Speed Ethernet Voltage (LVDD): 3.3 V ± 165 mV or 2.5 V ± 125 mV.
️· Other I/O Voltage (OV DD): 3.3 V ± 165 mV.
️· Local Bus Voltage (LBVDD): Varies based on needs, ranging from 1.8V to 3.3V.
️· SerDes Voltage (L[1,2]_ _n_ VDD): Mirrors core voltage.

4. Output Driver Characteristics

️· Output driver impedance varies based on voltage supply and driver type.
️· Ranges from 18Ω for DDR signals to 45Ω for other signals.
️· Specific values depend on the output driver type and voltage supply.

5. Power Dissipation (Estimated)

️· Sleep power at 65°C: ~1.45W.
️· Typical application power at 65°C: Between ~1.9W and ~2.0W (dependent on clock speeds)
️· Typical application power at 125°C: Between ~3.0 and ~3.3W (dependent on clock speeds)
️· Maximum application power at 125°C: Between ~3.8 and ~4.0W (dependent on clock speeds)

6. Important Notes/Cautions

️· Overshoot/Undershoot: The PCI interface has overshoot/undershoot allowances, but the processor might not fully comply with PCI specifications related to these values.
️· Power Rail Tracking: Core, PLL and I/O voltages must track each other and change direction in unison.

In essence, this document highlights the critical power sequencing and electrical characteristics needed to ensure reliable operation of the MPC8378E processor.