LAN9250 datasheet(320/421 Pages) MICROCHIP

320 / 421 page

LAN9250

DS00001913A-page 320

 2015 Microchip Technology Inc.

Note 1:

The default value of this field is determined by the configuration strap 1588_enable_strap.

Clock Step Seconds (1588_CLOCK_STEP_SECONDS)

Writing a one to this bit adds or subtracts the value of the Clock Step Adjust-

ment Value (1588_CLOCK_STEP_ADJ_VALUE) field in the 1588 Clock Step

Adjustment Register (1588_CLOCK_STEP_ADJ) to or from the seconds por-

tion of the 1588 Clock. The choice of adding or subtracting is set using the

Clock Step Adjustment Direction (1588_CLOCK_STEP_ADJ_DIR) bit.

Writing a zero to this bit has no affect.

Clock Load (1588_CLOCK_LOAD)

Writing a one to this bit writes the value of the 1588 Clock Seconds Register

(1588_CLOCK_SEC), the 1588 Clock NanoSeconds Register

(1588_CLOCK_NS) and the 1588 Clock Sub-NanoSeconds Register

(1588_CLOCK_SUBNS) into the 1588 Clock.

Writing a zero to this bit has no affect.

Clock Read (1588_CLOCK_READ)

Writing a one to this bit causes the current value of the 1588 clock to be

saved into the 1588 Clock Seconds Register (1588_CLOCK_SEC), the 1588

Clock NanoSeconds Register (1588_CLOCK_NS) and the 1588 Clock Sub-

NanoSeconds Register (1588_CLOCK_SUBNS) so it can be read.

Writing a zero to this bit has no affect.

1588 Enable (1588_ENABLE)

Writing a one to this bit will enable the 1588 unit. Reading this bit will return

the current enabled value.

Writing a zero to this bit has no affect.

R/W

Note 1:

1588 Disable (1588_DISABLE)

Writing a one to this bit will cause the 1588 Enable (1588_ENABLE) to clear

once all current frame processing is completed. No new frame processing

will be started if this bit is set.

Writing a zero to this bit has no affect.

1588 Reset (1588_RESET)

Writing a one to this bit resets the 1588 H/W, state machines and registers

and disables the 1588 unit.

Any frame modifications in progress are halted at the risk of causing frame

data or FCS errors. 1588_Reset should only be used once the 1588 unit is

disabled as indicated by the 1588 Enable (1588_ENABLE) bit.

Note:

Writing a zero to this bit has no affect.

Bits

Description

Type

Default

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