High Performance Two Port 10/100 Managed Ethernet Switch with
Datasheet
11.1.2Block Diagram
The LAN9312 IEEE 1588 implementation is illustrated in Figure 11.1, 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
This block provides IEEE 1588 clock
| IEEE 1588 | IEEE 1588 |
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| Time Stamp | Time Stamp |
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Ethernet | 10/100 | MII |
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1Port | 0Port |
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| PHY |
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| Switch Fabric |
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Ethernet | 10/100 | MII |
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| PHY | 2Port |
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| IEEE 1588 Time Stamp |
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| RX |
| Clock Capture RX |
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| Sync / Delay_Req |
| Src UUID Capture RX |
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| Msg Detect RX |
| Sequence ID Capture RX |
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| RX: Delay_Req for Master, Sync for Slave | IRQ Flag |
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| TX |
| Clock Capture TX |
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| Sync / Delay_Req |
| Src UUID Capture TX |
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| Msg Detect TX |
| Sequence ID Capture TX | host |
| TX: Sync for Master, Delay_Req for Slave | IRQ Flag |
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To Host MAC
| IEEE 1588 | Clock |
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| 32 Bit Addend |
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| carry |
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| 32 Bit Accumulator |
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| inc |
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| 64 Bit Clock |
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IEEE 1588 Clock Events
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| 64 Bit Reload / Add |
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| load / add |
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| 64 Bit Clock Target |
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GPIO[8:9] |
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| compare >= |
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| IRQ Flag |
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(Outputs) |
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GPIO[8:9] |
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| Clock Capture GPIO8 |
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(Inputs) |
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| IRQ Flag |
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| Clock Capture GPIO9 |
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| IRQ Flag |
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IRQ Flags | To INT_STS register |
IRQ Enables | X9 |
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Figure 11.1 IEEE 1588 Block Diagram
SMSC LAN9312 | 155 | Revision 1.4 |
| DATASHEET |
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