Emerson PMPPC7448 user manual Processor Reset, Processor Initialization

Central Processing Unit: Processor Reset
Figure 3-1:MPC7448 Block Diagram
	Instruction Unit
					Instruction MMU	Tags	32-KB
	Branch		Instruction				I Cache
Completion	Processing
			Queue
	Unit
Unit
	VR Issue	GPR Issue	FPR Issue		Data MMU	Tags	32-KB
							D Cache
Vector	Integer	Integer	Floating
Permute Unit
		Unit 1	Point
	Unit 2
		(3)	Unit
Vector Integer					Load/Store Unit
Unit 2
Vector Integer
Unit 1
Vector FPU			Memory Subsystem
		L1 Service		1 MB L2	System Bus
				Cache
		Queues			Interface
				Controller

PROCESSOR RESET

Circuitry on the PmPPC7448 module resets the processor and the board. It activates the RESET_OUT* signal on pin 60 of the P12 connector if the module voltages fall out of toler- ance or if the optional on-board reset switch is activated. A COP SRESET causes a soft reset to the processor, see the Reset Command register in Register Map 7-2.

PROCESSOR INITIALIZATION

Initially, the PmPPC7448 powers up with specific values stored in the CPU registers. The ini- tial power-up state of the Hardware Implementation Dependent register (HID0) and the Machine State register (MSR) are given in Table 3-2.

Table 3-2:CPU Internal Register Initialization

Register:	Default After Initialization (Hex):		Notes:
HID0	8000,0000	(icache and dcache off)	Hardware Implementation
			Dependent register
	8000,C000	(icache and dcache on)
			(See Register Map 3-1)
MSR	0000,B032		Machine State register
			(See Register Map 3-3)

3-2

PmPPC7448 User’s Manual 10006757-02