PXA270 datasheet(74/126 Pages) INTEL

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6-10

Electrical, Mechanical, and Thermal Specification

Intel® PXA270 Processor

AC Timing Specifications

6.2.7

Standby-Mode Timing

6.2.8

Idle-Mode Timing

6.2.9

Frequency-Change Timing

Table 6-9. Standby-Mode Timing Specifications

Symbol

Description

Min

Typical

Max

Units

—

13M mode to standby mode entry

—

0.34

—

msec

—

Standby mode exit to 13M mode1

0.28

—

11.282

msec

—

Run mode to standby mode entry

—

0.34

—

msec

—

Standby mode exit to run mode1

0.43

0.39

11.432

msec

NOTES:

1. The 13M oscillator is programmable

2. Add 0.1ms if the wake up event is external

Table 6-10. Idle-Mode Timing Specifications

Symbol

Description

Min

Typical

Max

Units

—

13M mode to deep idle mode entry

—

µs

—

Deep idle mode exit to 13M mode

—

µs

—

Run mode to idle run mode entry

—

µs

—

Idle run mode exit to run mode

—

µs

Table 6-11. Frequency-Change Timing Specifications

Symbol

Description

Min

Typical

Max

Units

—

Delay between MCR command to

frequency change sequence completion

—

1501

—

µs

—

Delay to change between turbo, half-

turbo and run modes

—

µs

—

Delay to enter 13M mode from any Run

mode 3

—

µs

—

Delay to exit 13M mode to any Run mode

—

µs

NOTES:

1. Any change to the CCCR[2N or L] bits followed by a write to CLFCFG[F] to initiate a frequency change

sequence, results in a PLL restart

2. Changing between turbo, half-turbo and run modes does not require a PLL restart

3. Software can only change into 13M mode from any run mode

4. Assuming software uses the PLL early enable feature (CCCR[PLL_EARLY_EN] prior to a frequency

change sequence

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