LAN9312 datasheet(214/458 Pages) SMSC

Part #	LAN9312

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

PDF	458 Pages

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Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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

Datasheet

Revision 1.2 (04-08-08)

214

SMSC LAN9312

DATASHEET

14.2.5.14

1588 Clock Low-DWORD Register (1588_CLOCK_LO)

This read/write register combined with 1588 Clock High-DWORD Register (1588_CLOCK_HI) 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.

Note:

Both this register and the 1588 Clock High-DWORD Register (1588_CLOCK_HI) 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.

Offset:

174h

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31:0

Clock Low (CLOCK_LO)

This field contains the low 32-bits of the 64-bit 1588 Clock.

R/W

00000000h

LAN9312 Datasheet(PDF) 214 Page - SMSC Corporation