ADSP-21364SBBCZENG datasheet(18/52 Pages) AD

18 / 52 page

Rev. PrB

Page 18 of 52

September 2004

ADSP-21364

Preliminary Technical Data

Power-Up Sequencing

The timing requirements for processor startup are given in

Table 10.

Table 10. Power-Up Sequencing Timing Requirements (Processor Startup)

Parameter

Min

Max

Unit

Timing Requirements

tRSTVDD

RESET Low Before VDDINT/VDDEXT on

tIVDDEVDD

VDDINT on Before VDDEXT

–50

200

tCLKVDD

CLKIN Valid After VDDINT/VDDEXT Valid

200

tCLKRST

CLKIN Valid Before RESET Deasserted

102

µs

tPLLRST

PLL Control Setup Before RESET Deasserted

203

µs

Switching Characteristic

tCORERST

Core Reset Deasserted After RESET Deasserted

4096tCK + 2 tCCLK

4, 5

1 Valid VDDINT/VDDEXT assumes that the supplies are fully ramped to their 1.2 and 3.3 volt rails. Voltage ramp rates can vary from microseconds to hundreds of milliseconds

depending on the design of the power supply subsystem.

2 Assumes a stable CLKIN signal, after meeting worst-case startup timing of crystal oscillators. Refer to your crystal oscillator manufacturer's datasheet for startup time.

Assume a 25 ms maximum oscillator startup time if using the XTAL pin and internal oscillator circuit in conjunction with an external crystal.

3 Based on CLKIN cycles

4 Applies after the power-up sequence is complete. Subsequent resets require a minimum of 4 CLKIN cycles for RESET to be held low in order to properly initialize and

propagate default states at all I/O pins.

5 The 4096 cycle count depends on tSRST specification in Table 12. If setup time is not met, 1 additional CLKIN cycle may be added to the core reset time, resulting in 4097

cycles maximum.

Figure 6. Power Up Sequencing

CLKIN

RESET

RSTOUT

VDDEXT

VDDINT

tPLLRST

tCLKRST

tCLKVDD

IVDDEVDD

CLK_CFG1-0

tCORERST

tRSTVDD

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