SMSC LAN9312 14.2.5.131588 Clock High-DWORDRegister (1588_CLOCK_HI)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

14.2.5.131588 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 11, "IEEE 1588 Hardware Time Stamp Unit," on page 154 for additional information.

BITS	DESCRIPTION	TYPE	DEFAULT
31:0	Clock High (CLOCK_HI)	R/W	00000000h
	This field contains the high 32-bits of the 64-bit 1588 Clock.

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.

SMSC LAN9312	213	Revision 1.4 (08-19-08)
	DATASHEET