MPC8540 datasheet(304/1302 Pages) FREESCALE

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MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

6-54

Freescale Semiconductor

Core Register Summary

6.15.4 Performance Monitor Counter Registers

(PMC0–PMC3, UPMC0–UPMC3)

Table 6-42. PMLCb0–PMLCb3 Field Descriptions

Bits

Name

Description

32–52

—

Reserved, should be cleared.

53–55

THRESHMUL

Threshold multiple

000 Threshold field is multiplied by 1 (PMLCbn[THRESHOLD]

× 1)

001 Threshold field is multiplied by 2 (PMLCbn[THRESHOLD]

× 2)

010 Threshold field is multiplied by 4 (PMLCbn[THRESHOLD]

× 4)

011 Threshold field is multiplied by 8 (PMLCbn[THRESHOLD]

× 8)

100 Threshold field is multiplied by 16 (PMLCbn[THRESHOLD]

× 16)

101 Threshold field is multiplied by 32 (PMLCbn[THRESHOLD]

× 32)

110 Threshold field is multiplied by 64 (PMLCbn[THRESHOLD]

× 64)

111 Threshold field is multiplied by 128 (PMLCbn[THRESHOLD]

× 128)

56–57

—

Reserved, should be cleared.

58–63

THRESHOLD

Threshold. Only events that exceed the threshold value are counted. Such events are

implementation-dependent as are the dimension (for example duration in cycles) and

granularity with which the value is interpreted.

By varying the value, software can obtain a profile of the event characteristics subject to

thresholding. For example, if PMC1 is configured to count cache misses that last longer

than the threshold value, software can obtain the distribution of cache miss durations for a

given program by monitoring the program repeatedly using a different threshold each time.

Field OV

Counter value

Reset

All zeros

R/W

PMC0–PMC3: Supervisor R/W

UPMC0–UPMC3: User read only

PMR

PMC0: PMR16, PMC1: PMR17, PMC2,: PMR18, PMC3: PMR19

UPMC0: PMR0, UPMC1: PMR1, UPMC2,: PMR2, UPMC3: PMR3

Figure 6-59. Performance Monitor Counter Registers (PMC0–PMC3),

User Performance Monitor Counter Registers (UPMC0–UPMC3)

Table 6-43. PMC0–PMC3 Field Descriptions

Bits

Name

Description

Overflow. When this bit is set, it indicates this counter reaches its maximum value.

33–63

Counter value

Indicates the number of occurrences of the specified event

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