DP83846 datasheet(56/59 Pages) NSC

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6.6 Reset Timing

Note: Software Reset should be initiated no sooner then 500

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

Note: 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

T6.1.1

Post RESET Stabilization time

prior to MDC preamble for reg-

ister accesses

MDIO is pulled high for 32-bit serial man-

agement initialization

µs

T6.1.2

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

T6.1.3

Hardware Configuration pins

transition to output drivers

3.5

µs

T6.1.4

RESET pulse width

160

µs

VCC

HARDWARE

RSTN

MDC

32 CLOCKS

Latch-In of Hardware

Configuration Pins

Dual Function Pins

Become Enabled As Outputs

INPUT

OUTPUT

T6.1.3

T6.1.2

T6.1.1

T6.1.4

DP83846 Datasheet(PDF) 56 Page - National Semiconductor (TI)

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