DP83847 datasheet(46/60 Pages) NSC

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6.1 Reset Timing

Note1: Software Reset should be initiated no sooner then 500

µs after power-up or the deassertion of hardware reset.

Note2: It is important to choose pull-up and/or pull-down resistors for each of the hardware configuration pins that provide

fast RC time constants in order to latch-in the proper value prior to the pin transitioning to an output driver.

Parameter

Description

Notes

Min

Typ

Max

Units

T1.0.1

Post RESET Stabilization time

prior to MDC preamble for reg-

ister accesses

MDIO is pulled high for 32-bit serial man-

agement initialization.

µs

T1.0.2

Hardware Configuration Latch-

in Time from the Deassertion of

RESET (either soft or hard)

Hardware Configuration Pins are de-

scribed in the Pin Description section.

µs

T1.0.3

Hardware Configuration pins

transition to output drivers

3.5

µs

T1.0.4

RESET pulse width

X1 Clock must be stable for at min. of

160us during RESET pulse low time.

160

µs

VCC

HARDWARE

RSTN

MDC

32 CLOCKS

Latch-In of Hardware

Configuration Pins

Dual Function Pins

Become Enabled As Outputs

INPUT

OUTPUT

T1.0.3

T1.0.2

T1.0.1

T1.0.4

X1 Clock

DP83847 Datasheet(PDF) 46 Page - National Semiconductor (TI)

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