IEEE Standard for Ethernet SECTION THREE This section includes Clause 34 through Clause 43 and Annex 36A through Annex 43C. Contents 34. Introduction to 1000 Mb/s baseband network ...................................................................................... 16 34.1 Overview..................................................................................................................................... 16 34.1.1 Reconciliation Sublayer (RS) and Gigabit Media Independent Interface (GMII).............. 16 34.1.2 Physical Layer signaling systems ....................................................................................... 17 34.1.3 Repeater .............................................................................................................................. 17 34.1.4 Auto-Negotiation, type 1000BASE-X................................................................................ 17 34.1.5 Auto-Negotiation, type 1000BASE-T ................................................................................ 17 34.1.6 Management........................................................................................................................ 17 34.2 State diagrams............................................................................................................................. 17 34.3 Protocol implementation conformance statement (PICS) proforma........................................... 18 35. Reconciliation Sublayer (RS) and Gigabit Media Independent Interface (GMII)................................ 19 35.1 Overview..................................................................................................................................... 19 35.1.1 Summary of major concepts ............................................................................................... 20 35.1.2 Application.......................................................................................................................... 20 35.1.3 Rate of operation................................................................................................................. 20 35.1.4 Allocation of functions ....................................................................................................... 20 35.2 Functional specifications ............................................................................................................ 21 1 Copyright © 2016 IEEE. All rights reserved. 35.2.1 Mapping of GMII signals to PLS service primitives and Station Management................. 21 35.2.1.1 Mapping of PLS_DATA.request ............................................................................. 21 35.2.1.1.1 Function ......................................................................................................... 21 35.2.1.1.2 Semantics of the service primitive.................................................................. 21 35.2.1.1.3 When generated ............................................................................................. 22 35.2.1.2 Mapping of PLS_DATA.indication......................................................................... 22 35.2.1.2.1 Function ......................................................................................................... 22 35.2.1.2.2 Semantics of the service primitive................................................................. 22 35.2.1.2.3 When generated .............................................................................................. 22 35.2.1.3 Mapping of PLS_CARRIER.indication ................................................................... 22 35.2.1.3.1 Function ......................................................................................................... 22 35.2.1.3.2 Semantics of the service primitive.................................................................. 22 35.2.1.3.3 When generated ............................................................................................. 23 35.2.1.4 Mapping of PLS_SIGNAL.indication ...................................................................... 23 35.2.1.4.1 Function ......................................................................................................... 23 35.2.1.4.2 Semantics of the service primitive.................................................................. 23 35.2.1.4.3 When generated ............................................................................................. 23 35.2.1.5 Response to error indications from GMII................................................................ 23 35.2.1.6 Conditions for generation of TX_ER....................................................................... 23 35.2.1.7 Mapping of PLS_DATA_VALID.indication ........................................................... 24 35.2.1.7.1 Function ......................................................................................................... 24 35.2.1.7.2 Semantics of the service primitive.................................................................. 24 35.2.1.7.3 When generated ............................................................................................. 24 35.2.2 GMII signal functional specifications................................................................................. 24 35.2.2.1 GTX_CLK (1000 Mb/s transmit clock).................................................................... 24 35.2.2.2 RX_CLK (receive clock) .......................................................................................... 24 35.2.2.3 TX_EN (transmit enable).......................................................................................... 25 35.2.2.4 TXD (transmit data)................................................................................................. 25 35.2.2.5 TX_ER (transmit coding error)................................................................................ 26 35.2.2.6 Transmit direction LPI transition.............................................................................. 28 35.2.2.7 RX_DV (receive data valid) ..................................................................................... 29 35.2.2.8 RXD (receive data) .................................................................................................. 29 35.2.2.9 RX_ER (receive error).............................................................................................. 31 35.2.2.10 Receive direction LPI transition ............................................................................... 32 35.2.2.11 CRS (carrier sense) ................................................................................................... 33 35.2.2.12 COL (collision detected).......................................................................................... 33 35.2.2.13 MDC (management data clock)................................................................................ 34 35.2.2.14 MDIO (management data input/output) .................................................................. 34 35.2.3 GMII data stream ................................................................................................................ 34 35.2.3.1 Inter-frame <inter-frame>......................................................................................... 34 35.2.3.2 Preamble <preamble> and start of frame delimiter <sfd>........................................ 35 35.2.3.2.1 Transmit case ................................................................................................. 35 35.2.3.2.2 Receive case.................................................................................................... 35 35.2.3.3 Data <data>............................................................................................................... 36 35.2.3.4 End-of-Frame delimiter <efd>.................................................................................. 36 35.2.3.5 Carrier extension <extend>....................................................................................... 36 35.2.3.6 Definition of Start of Packet and End of Packet Delimiters ..................................... 36 35.2.4 MAC delay constraints (with GMII) .................................................................................. 37 35.2.5 Management functions........................................................................................................ 37 35.3 Signal mapping ........................................................................................................................... 37 35.4 LPI Assertion and Detection....................................................................................................... 38 35.4.1 LPI messages ...................................................................................................................... 39 35.4.2 Transmit LPI state diagram................................................................................................. 39 35.4.2.1 Conventions .............................................................................................................. 39 2 Copyright © 2016 IEEE. All rights reserved. 35.4.2.2 Variables and counters.............................................................................................. 39 35.4.2.3 State diagram ............................................................................................................ 40 35.4.3 Considerations for transmit system behavior...................................................................... 40 35.4.3.1 Considerations