LAN9353 Datasheet, PDF (432/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
15.8.11 1588 CLOCK STEP ADJUSTMENT REGISTER (1588_CLOCK_STEP_ADJ)
Offset:
Bank:
128h
na
Size:
32 bits
This register is used to perform a one-time adjustment to either the seconds portion or the nanoseconds portion of the
1588 Clock. The amount and direction can be specified.
Bits
Description
31 Clock Step Adjustment Direction (1588_CLOCK_STEP_ADJ_DIR)
This field specifies if the Clock Step Adjustment Value (1588_CLOCK_-
STEP_ADJ_VALUE) is added to or subtracted from the 1588 Clock.
0 = subtracted
1 = added
Note: Only addition is supported for the nanoseconds portion of the 1588
Clock
30 RESERVED
29:0 Clock Step Adjustment Value (1588_CLOCK_STEP_ADJ_VALUE)
When the nanoseconds portion of the 1588 Clock is being adjusted, this field
specifies the amount to add. This is in lieu of the normal 9, 10 or 11 ns incre-
ment.
When the seconds portion of the 1588 Clock is being adjusted, the lower 4
bits of this field specify the amount to add to or subtract.
Type
R/W
RO
R/W
Default
0b
-
00000000h
DS00001925A-page 432
 2015 Microchip Technology Inc.