Switch User Manual

Preface ...................................................................................................................................... 10

1 Introduction ...................................................................................................................... 12

1.1 Purpose of the Peripheral ............................................................................................. 12

1.2 Features ................................................................................................................. 12

1.3 Functional Block Diagram ............................................................................................. 13

1.4 Industry Standard(s) Compliance Statement ....................................................................... 14

2 Architecture ...................................................................................................................... 14

2.1 Clock Control ........................................................................................................... 14

2.2 Memory Map ............................................................................................................ 14

2.3 Signal Descriptions .................................................................................................... 14

2.4 Ethernet Protocol Overview .......................................................................................... 17

2.5 Programming Interface ................................................................................................ 18

2.6 EMAC Control Module ................................................................................................ 29

2.7 MDIO Module ........................................................................................................... 30

2.8 EMAC Module .......................................................................................................... 35

2.9 MAC Interface .......................................................................................................... 37

2.10 Packet Receive Operation ............................................................................................ 41

2.11 Packet Transmit Operation ........................................................................................... 46

2.12 Receive and Transmit Latency ....................................................................................... 47

2.13 Transfer Node Priority ................................................................................................. 47

2.14 Reset Considerations .................................................................................................. 48

2.15 Initialization ............................................................................................................. 49

2.16 Interrupt Support ....................................................................................................... 51

2.17 Power Management ................................................................................................... 55

2.18 Emulation Considerations ............................................................................................. 55

3 EMAC Control Module Registers ......................................................................................... 56

3.1 EMAC Control Module Revision ID Register (REVID) ............................................................ 57

3.2 EMAC Control Module Software Reset Register (SOFTRESET) ............................................... 58

3.3 EMAC Control Module Interrupt Control Register (INTCONTROL) ............................................. 59

3.4 EMAC Control Module Interrupt Core Receive Threshold Interrupt Enable Registers

(C0RXTHRESHEN-C2RXTHRESHEN) ............................................................................. 60

3.5 EMAC Control Module Interrupt Core Receive Interrupt Enable Registers (C0RXEN-C2RXEN) ........... 61

3.6 EMAC Control Module Interrupt Core Transmit Interrupt Enable Registers (C0TXEN-C2TXEN) ........... 62

3.7 EMAC Control Module Interrupt Core Miscellaneous Interrupt Enable Registers

(C0MISCEN-C2MISCEN) ............................................................................................. 63

3.8 EMAC Control Module Interrupt Core Receive Threshold Interrupt Status Registers

(C0RXTHRESHSTAT-C2RXTHRESHSTAT) ...................................................................... 64

3.9 EMAC Control Module Interrupt Core Receive Interrupt Status Registers (C0RXSTAT-C2RXSTAT)

............................................................................................................................ 65

3.10 EMAC Control Module Interrupt Core Transmit Interrupt Status Registers (C0TXSTAT-C2TXSTAT)

............................................................................................................................ 66

3.11 EMAC Control Module Interrupt Core Miscellaneous Interrupt Status Registers

(C0MISCSTAT-C2MISCSTAT) ...................................................................................... 67

3.12 EMAC Control Module Interrupt Core Receive Interrupts Per Millisecond Registers

SPRUFL5B–April 2011 Table of Contents

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