LAN9312 datasheet(155/458 Pages) SMSC

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

Datasheet

SMSC LAN9312

155

Revision 1.2 (04-08-08)

DATASHEET

11.1.2

Block Diagram

The LAN9312 IEEE 1588 implementation is illustrated in Figure 11.1, and consists of the following

major function blocks:

IEEE 1588 Time Stamp

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

IEEE 1588 Clock

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

stamp related functions.

IEEE 1588 Clock/Events

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

GPIO event generation.

Figure 11.1 IEEE 1588 Block Diagram

10/100

PHY

Ethernet

10/100

PHY

MII

Ethernet

IEEE 1588

Time Stamp

MII

To Host MAC

IEEE 1588

Time Stamp

IEEE 1588 Time Stamp

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

TX: Sync for Master, Delay_Req for Slave

RX: Delay_Req for Master, Sync for Slave

host

IEEE 1588 Clock

64 Bit Clock

carry

32 Bit Accumulator

32 Bit Addend

inc

host

IEEE 1588 Clock Events

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

Switch Fabric

IRQ Enables

To INT_STS register

IRQ Flags

MII

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