LAN9353 Datasheet, PDF (419/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
Bits
Description
Type
5
Clock Step Seconds (1588_CLOCK_STEP_SECONDS)
WO
Writing a one to this bit adds or subtracts the value of the Clock Step Adjust-
SC
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.
4
Clock Load (1588_CLOCK_LOAD)
WO
Writing a one to this bit writes the value of the 1588 Clock Seconds Register
SC
(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.
3
Clock Read (1588_CLOCK_READ)
WO
Writing a one to this bit causes the current value of the 1588 clock to be
SC
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.
2
1588 Enable (1588_ENABLE)
R/W
Writing a one to this bit will enable the 1588 unit. Reading this bit will return
SC
the current enabled value.
Writing a zero to this bit has no affect.
Note:
Ports are individually enabled with the Time-Stamp Unit 2-0 Enable
bits in the 1588 General Configuration Register
(1588_GENERAL_CONFIG).
Default
0b
0b
0b
Note 1:
1
1588 Disable (1588_DISABLE)
WO
0b
Writing a one to this bit will cause the 1588 Enable (1588_ENABLE) to clear
SC
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.
0
1588 Reset (1588_RESET)
WO
0b
Writing a one to this bit resets the 1588 H/W, state machines and registers
SC
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.
Note 1: The default value of this field is determined by the configuration strap 1588_enable_strap.
 2015 Microchip Technology Inc.
DS00001925A-page 419