LAN9250 datasheet(319/421 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001913A-page 319

LAN9250

14.8.1

1588 COMMAND AND CONTROL REGISTER (1588_CMD_CTL)

Offset:

100h

Size:

32 bits

Bank:

Bits

Description

Type

Default

31:14

RESERVED

Clock Target Read (1588_CLOCK_TARGET_READ)

Writing a one to this bit causes the current values of both of the 1588 clock

targets (A and B) to be saved into the 1588 Clock Target x Seconds Register

(1588_CLOCK_TARGET_SEC_x) and the 1588 Clock Target x NanoSec-

onds Register (1588_CLOCK_TARGET_NS_x) so they can be read.

Writing a zero to this bit has no affect.

12:9

1588 Manual Capture Select 3-0 (1588_MANUAL_CAPTURE_SEL[3:0])

These bits specify which GPIO 1588 Clock Capture Registers are used

during a manual capture. Bit 3 selects the rising edge (0) or falling edge (1)

registers. Bits 2-0 select the GPIO number.

Note:

All 8 GPIO register sets are available.

R/W

0000b

1588 Manual Capture (1588_MANUAL_CAPTURE)

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

saved into the GPIO 1588 Clock Capture Registers specified above.

The corresponding bit in the 1588 Interrupt Status Register (1588_INT_STS)

is also set.

Writing a zero to this bit has no affect.

Clock Temporary Rate (1588_CLOCK_TEMP_RATE)

Writing a one to this bit enables the use of the temporary clock rate adjust-

ment specified in the 1588 Clock Temporary Rate Adjustment Register

(1588_CLOCK_TEMP_RATE_ADJ) for the duration specified in the 1588

Clock Temporary Rate Duration Register (1588_CLOCK_TEMP_RATE_DU-

RATION).

Writing a zero to this bit has no affect.

Clock Step NanoSeconds (1588_CLOCK_STEP_NANOSECONDS)

Writing a one to this bit adds the value of the Clock Step Adjustment Value

(1588_CLOCK_STEP_ADJ_VALUE) field in the 1588 Clock Step Adjustment

Clock.

Writing a zero to this bit has no affect.

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