MDI/MDI-X Auto Crossover .............................................................................................................................................. 18
Functional Overview: Power Management....................................................................................................................... 22
Normal Operation Mode ................................................................................................................................................... 23
Energy Detect Mode ......................................................................................................................................................... 23
Soft Power Down Mode .................................................................................................................................................... 23
Power Saving Mode.......................................................................................................................................................... 23
Port based Power Down Mode ......................................................................................................................................... 23
Hardware Power Down..................................................................................................................................................... 24
Functional Overview: MAC and Switch ............................................................................................................................ 24
MAC Operation ................................................................................................................................................................. 27
Inter Packet Gap (IPG) .............................................................................................................................................. 27
Late Collision ............................................................................................................................................................. 27
Full Duplex Flow Control............................................................................................................................................ 27
Port Individual MAC address and Source Port Filtering ............................................................................................ 28
MII Interface Operation ..................................................................................................................................................... 28
MII Management (MIIM) Interface .................................................................................................................................... 29
Serial Management Interface (SMI).................................................................................................................................. 29
Spanning Tree Support..................................................................................................................................................... 33
Rapid Spanning Tree Support .......................................................................................................................................... 34
IGMP Support ................................................................................................................................................................... 35
IGMP Send Back to the Subscribed Port .................................................................................................................. 35
Port Mirroring Support ...................................................................................................................................................... 35
Rate Limiting Support ....................................................................................................................................................... 36
Unicast MAC Address Filtering......................................................................................................................................... 36
C Master Serial Bus Configuration .......................................................................................................................... 36
I2C Slave Serial Bus Configuration ........................................................................................................................... 37
SPI Slave Serial Bus Configuration ........................................................................................................................... 38
Global Registers ............................................................................................................................................................... 48
Port Registers ................................................................................................................................................................... 48
Advanced Control Registers ............................................................................................................................................. 48
Register 3 (0x03): Global Control 1 ........................................................................................................................... 50
Register 4 (0x04): Global Control 2 ........................................................................................................................... 50
Register 5 (0x05): Global Control 3 ........................................................................................................................... 51
Register 6 (0x06): Global Control 4 ........................................................................................................................... 52
Register 7 (0x07): Global Control 5 ........................................................................................................................... 52
Register 8 (0x08): Global Control 6 ........................................................................................................................... 53
Register 9 (0x09): Global Control 7 ........................................................................................................................... 53
Register 10 (0x0A): Global Control 8......................................................................................................................... 53
Register 11 (0x0B): Global Control 9......................................................................................................................... 53
Register 12 (0x0C): Global Control 10 ...................................................................................................................... 53
Register 13 (0x0D): Global Control 11 ...................................................................................................................... 54
Register 14 (0x0E): Global Control 12....................................................................................................................... 54
Register 15 (0x0F): Global Control 13....................................................................................................................... 54
Port Registers (Registers 16 – 95) ................................................................................................................................... 55
Register 16 (0x10): Port 1 Control 0.......................................................................................................................... 55
Register 32 (0x20): Port 2 Control 0.......................................................................................................................... 55
Register 48 (0x30): Port 3 Control 0.......................................................................................................................... 55
Register 17 (0x11): Port 1 Control 1.......................................................................................................................... 56
Register 33 (0x21): Port 2 Control 1.......................................................................................................................... 56
Register 49 (0x31): Port 3 Control 1.......................................................................................................................... 56
We have specially compiled the opinions of engineers with many years of experience in embedded programming, and summarized them into a note that can be instructive for embedded programming experience....
1. What is overshoot?
When a faster signal drives a longer trace and there is no effective matching in the trace topology, overshoot often occurs. The main problem caused by overshoot is that the "1...
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