SMSC LAN9311 User Manual

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

Revision 1.4 (08-19-08)

156

SMSC LAN9311/LAN9311i

 

The LAN9311/LAN9311i IEEE 1588 implementation is illustrated in 

, and consists of the

following major function blocks:

„

These three identical blocks provide time stamping functions on all switch fabric ports.

„

This block provides a 64-bit tunable clock that is used as the time source for all IEEE 1588 time 
stamp related functions.

„

This block provides IEEE 1588 clock comparison-based interrupt generation and time stamp related 
GPIO event generation.

Ethernet

MII

Ethernet

MII

To Host MAC

Sync / Delay_Req 

Msg Detect RX

Sync / Delay_Req 

Msg Detect TX

Clock Capture RX

Src UUID Capture RX

Sequence ID Capture RX

IRQ Flag

Clock Capture TX

Src UUID Capture TX

Sequence ID Capture TX

IRQ Flag

RX

TX

TX: Sync for Master, Delay_Req for Slave

RX: Delay_Req for Master, Sync for Slave

host

64 Bit Clock

carry

32 Bit Accumulator

32 Bit Addend

+

inc

host

Clock Capture GPIO8

IRQ Flag

GPIO[8:9] 

(Inputs)

Clock Capture GPIO9

IRQ Flag

64 Bit Clock Target

IRQ Flag

compare >=

64 Bit Reload / Add

load / add

GPIO[8:9] 

(Outputs)

host

IRQ Enables

X9

To INT_STS register

IRQ Flags

Po
rt

 2

Po
rt

 0

Po
rt

 1

MII