LAN9313 Datasheet, PDF (176/398 Pages) SMSC Corporation – Three Port 10/100 Managed Ethernet Switch with MII

Three Port 10/100 Managed Ethernet Switch with MII
Datasheet
13.1.4.13 1588 Clock High-DWORD Register (1588_CLOCK_HI)
Offset:
170h
Size:
32 bits
This read/write register combined with 1588 Clock Low-DWORD Register (1588_CLOCK_LO) form the
64-bit 1588 Clock value. The 1588 Clock value is used for all 1588 timestamping. The 1588 Clock has
a base frequency of 100MHz, which can be adjusted via the 1588 Clock Addend Register
(1588_CLOCK_ADDEND) accordingly. Refer to Chapter 10, "IEEE 1588 Hardware Time Stamp Unit,"
on page 134 for additional information.
BITS
DESCRIPTION
31:0 Clock High (CLOCK_HI)
This field contains the high 32-bits of the 64-bit 1588 Clock.
TYPE
R/W
DEFAULT
00000000h
Note: Both this register and the 1588 Clock Low-DWORD Register (1588_CLOCK_LO) must be
written for either to be affected.
Note: The value read is the saved value of the 1588 Clock when the 1588_CLOCK_SNAPSHOT bit
in the 1588 Command Register (1588_CMD) is set.
Revision 1.2 (04-08-08)
176
DATASHEET
SMSC LAN9313/LAN9313i