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

Datasheet

14.2.5.241588 Command Register (1588_CMD)

Offset:

19Ch

Size:

32 bits

This register is used to issue 1588 commands. Using the clock snapshot bit allows the host to properly read the current IEEE 1588 clock values from the 1588 Clock High-DWORD Register (1588_CLOCK_HI) and 1588 Clock Low-DWORD Register (1588_CLOCK_LO). Refer to section Section 11.3, "IEEE 1588 Clock," on page 159 for additional information.

BITS

DESCRIPTION

TYPE

DEFAULT

 

 

 

 

31:1

RESERVED

RO

-

 

 

 

 

0

Clock Snapshot (1588_CLOCK_SNAPSHOT)

WO

0b

 

Setting this bit causes the current 1588 Clock High-DWORD Register

SC

 

 

(1588_CLOCK_HI) and 1588 Clock Low-DWORD Register

 

 

 

(1588_CLOCK_LO) values to be saved so they can be read.

 

 

 

 

 

 

Revision 1.4 (08-19-08)

228

SMSC LAN9312

 

DATASHEET