Motorola PrPMC800/800ET Processor PMC Module PrPMC800/800ET Power Supplies, Module Reset Logic

3 Functional Description

PrPMC800/800ET Power Supplies

The PrPMC800/800ET module requires only a +3.3V input voltage. The processor core voltage and the Harrier core voltage are generated on the module from the +3.3V input using the LTC1702 dual synchronous switching regulator. In addition to the Harrier core voltage, the +2.5V supply provides the processor, Harrier, and L2 cache I/O voltages.

Module Reset Logic

A block diagram of the PrPMC800/800ET module reset logic appears in Figure 3-2 on page 24.

There are five standard sources of reset on the PrPMC800/800ET. They are:

1.Power-Up reset

2.PMC PCI RST#

3.Watchdog Timer reset via the Harrier Watchdog 1 Timer output

4.Software generated module reset from Harrier RSTOUT control bit

5.Debug RESET_L signal from debug header

The following table describes the function of each reset source. A module reset includes the processor, Harrier and Ethernet. The RESETOUT_L pin must be tied into the baseboard reset logic, which drives PCIRST# in order to produce module reset.

Table 3-4. Reset Source Functions

Reset Source Type	Module Reset	PrPMC RESETOUT_L
		Active
Power-Up Reset	x	x
PMC PCI RST#	x
WDT1 Timer Output		x
SW Reset		x
Debug Reset		x

PrPMC800/800ET Processor PMC Module Installation and Use (PrPMC800A/IH5) 23