IBM 750GL, 750GX 10. Power and Thermal Management, 11. Performance Monitor and System Related Features

User’s Manual
IBM PowerPC 750GX and 750GL RISC Microprocessor
	8.6.2 No-DRTRY Mode .................................................................................................................	318
8.7	Processor State Signals ................................................................................................................	319
	8.7.1 Support for the lwarx and stwcx. Instruction Pair ...............................................................	319
	8.7.2 TLBISYNC Input ..................................................................................................................	319
8.8	IEEE 1149.1a-1993 Compliant Interface .......................................................................................	319
	8.8.1 JTAG/COP Interface ............................................................................................................	319
8.9	Using Data-BusWrite-Only ...........................................................................................................	320
9. L2 Cache ...................................................................................................................		323
9.1	L2 Cache Overview .......................................................................................................................	323
9.2	L2 Cache Operation ......................................................................................................................	323
9.3	L2 Cache Control Register (L2CR) ...............................................................................................	329
9.4	L2 Cache Initialization ...................................................................................................................	329
9.5	L2 Cache Global Invalidation ........................................................................................................	329
9.6	L2 Cache Used as On-Chip Memory ............................................................................................	330
	9.6.1 Locking the L2 Cache ..........................................................................................................	330
	9.6.1.1 Loading the Locked L2 Cache ......................................................................................	331
	9.6.1.2 Locked Cache Operation ..............................................................................................	331
9.7	Data-Only and Instruction-Only Modes .........................................................................................	332
9.8	L2 Cache Test Features and Methods ..........................................................................................	332
	9.8.1 L2CR Support for L2 Cache Testing ....................................................................................	332
	9.8.2 L2 Cache Testing .................................................................................................................	333
9.9	L2 Cache Timing ...........................................................................................................................	333
10. Power and Thermal Management ........................................................................		335
10.1 Dynamic Power Management .....................................................................................................		335
10.2 Programmable Power Modes ......................................................................................................		335
	10.2.1 Power Management Modes ...............................................................................................	337
	10.2.1.1 Full On Mode ..............................................................................................................	337
	10.2.1.2 Doze Mode .................................................................................................................	337
	10.2.1.3 Nap Mode ...................................................................................................................	337
	10.2.1.4 Sleep Mode ................................................................................................................	339
	10.2.1.5 Dynamic Power Reduction .........................................................................................	339
	10.2.2 Power Management Software Considerations ...................................................................	340
10.3 750GX Dual PLL Feature ............................................................................................................		340
	10.3.1 Overview ............................................................................................................................	340
	10.3.2 Configuration Restriction on Frequency Transitions ..........................................................	341
	10.3.3 Dual PLL Implementation ...................................................................................................	342
10.4 Thermal Assist Unit .....................................................................................................................		343
	10.4.1 Thermal Assist Unit Overview ............................................................................................	343
	10.4.2 Thermal Assist Unit Operation ...........................................................................................	344
	10.4.2.1 TAU Single-Threshold Mode ......................................................................................	345
	10.4.2.2 TAU Dual-Threshold Mode .........................................................................................	346
	10.4.2.3 750GX Junction Temperature Determination .............................................................	346
	10.4.2.4 Power Saving Modes and TAU Operation ..................................................................	347
10.5 Instruction-Cache Throttling ........................................................................................................		347
11. Performance Monitor and System Related Features .........................................		349
		750gx_umTOC.fm.(1.2)
Page 10 of 377		March 27, 2006