Manuals / Brands / Computer Equipment / Network Card / SMSC / Computer Equipment / Network Card

SMSC LAN91C111 10 Migrating From LAN91C100FD and LAN83C183 to LAN91C111, 10.1 91C111 Overview

1 60

Download 60 pages, 677.02 Kb

SMSC LAN91C111 32/16/8-Bit Three-In-One Fast Ethernet Controller

Poll for TX INT

Read the INTERRUPT register (bank 2, offset C) until bit 1 (TX INT) is set (< 100ms) End loop I

The test fails if the allocation fails, the MIR register is incorrect, or the TX INT bit was not set for any packet within 100ms.

7. RESET TX FIFO’s

Perform Section 9.7 - EPH Loopback Test, page 62 one time

Write 0x0020 to the MMUCOM register (bank 2, offset 0)

Poll for Alloc INT

Read the INTERRUPT register (bank 2, offset C) until bit 3 (ALLOC INT) is set

Turn off transmitter

Write 0x0000 to the TRANSMIT CONTROL register (bank 0, offset 0)

Write 0x00C0 to the MMUCOM register

Read the MIR register (bank 0, offset 8), should equal 0x0104

Read the FIFO PORTS register (bank 2, offset 4), should equal 0x0100

Write 0x00E0 to the MMUCOM register

Read the MIR register, should equal 0x0104

Read the FIFO register, should equal 0x0182

The test fails if the EPH loopback fails, the allocation fails, or the MIR or FIFO registers are incorrect. If any of above tests fails, please check your hardware and software to debug the chip again.

10 Migrating From LAN91C100FD and LAN83C183 to LAN91C111

This section provides guidelines for migrating from SMSC’s discrete MAC+PHY solution (LAN91C100+LAN83C183) to SMSC’s integrated MAC+PHY solution the LAN91C111. While portions of this material is repetitive with other sections above, it has been consolidated here to aid design engineers with the specific task of migrating from an existing LAN91C100FD design to the SMSC LAN91C111.

10.1 91C111 Overview

The LAN91C111 is a non-PCI 10/100Mbps Ethernet Controller that integrates the Media Access Control (MAC), the Physical Layer Device (PHY) and an 8K Byte packet buffer SRAM on a single chip. The MAC includes a dual speed (10/100) CSMA/CD engine and supports both synchronous and asynchronous buses. SMSC’s patented Memory Management Unit (MMU) dynamically and efficiently manages buffer memory with minimal host CPU overhead. The PHY contains the functions that transmit, receive, and manage the encoded signals that are impressed on and recovered from the physical medium.

Revision 1.0 (08-14-08)

56

SMSC AN 9.6

APPLICATION NOTE

Contents

1 Overview 1.1Audience 2 Introduction Page 3 Description Of Bus Interface Unit (BIU) 3.2ISA Bus 3.38-BitBus 3.3.1Address Decoding Example 3.3.2I/O Base Address 300h Decoding 3.4Asynchronous Interface 3.4.1Typical Signal Connection with Asynchronous Buses 3.4.2Signal Connection with Asynchronous Interfacing 3.5Synchronous Interface (VL-Bus) 3.5.1Typical Connection with Synchronous Interface (VL-Bus) 3.5.2Signal Connection with Synchronous Interfacing LAN91C111 3.5.3Address Bus 3.5.4AEN 3.5.5W/NR 3.5.6NRDYRTN 3.5.7NSRDY 3.5.8LCLK – Clock Input 3.5.9Reset 3.5.10 NBE0-NBE3 3.6Timing Analysis 3.6.1Write Cycle Address Phase - Cycle Start 3.6.2Write Cycle Data Phase - Cycle End 3.6.3Read Cycle 3.6.4Read Cycle Address Phase – Cycle Start 3.6.5Read Cycle Delay Phase 3.6.6Read Cycle Data Phase – Cycle End 3.7Direct Data Register Access interface (nDATACS) 3.7.1The Use of NDATACS 3.7.2Pointer Register 3.7.3Data Register 3.7.4Timing Analysis Of Direct Access 3.8Asynchronous Read or Write Operation – Non Burst 3.9Burst Mode Operation Timing – Synchronous Operation 3.10 Burst Mode Write Operation 3.11 Burst Mode Read Operation 3.12 LAN91C111 Bus Interface 3.13 Sample Routine of Performance Measurement and Tuning Flow Chart 4 System Hardware Design 4.1Quartz Crystal 4.2Clock Oscillator 4.3X25OUT 4.4Serial EEPROM Operation 4.4.1INDIVIDUAL ADDRESS 20-22hex 4.4.2Use the Serial EEPROM as an Option 4.4.3How to Change the IOBASE Address 4.5Power Supply Decoupling 4.6System Power Consumption 4.7Auto Negotiation 4.7.1Initialization Sequence Steps Page 4.9Loopback 4.9.1EPH Internal Loopback (MAC) 4.9.2Diagnostic Loopback 4.9.3External Loopback Page 4.10 LED Operation 4.10.1LED Description 4.11 Thermal Information 5 Memory Management Unit - Features and Benefits 5.1Memory Partitioning 6 Big and Little Endian Issues on the LAN91C111 6.1Introduction 6.2Definition 6.2.1Big Endian 6.2.2Little Endian 6.3Implications for the LAN91C111 6.4Physical connections for Big Endian Page 6.5Software Considerations for Big Endian 6.6Source Code Example Page 6.6.1Conclusion 7 Physical Layer and Magnetics 7.1Transmit / Receive Interface 7.1.1Transmit Interface 7.1.2Receive Interface 7.1.3Magnetics 7.2RBIAS 7.2.1RBIAS pin 7.2.2TP Transmit Output Current Set 7.2.3Cable Selection 7.2.4Transmitter Droop 7.3MII Management Functions 7.3.1Example Routines To Read and Write the PHY Registers Page Page Page 7.4Multiple Register Access 8 Reset Operation 9 Functional Test and Diagnostic 9.1MAC Register Test 9.2RAM Buffer Test 9.3Transmitting A Packet 9.4Releasing The Transmitted Packet 9.5Receiving A Packet 9.6Releasing A Received Packet 9.7EPH Loopback Test 9.8PHY Loopback Test 9.9External Loopback Test 9.10 MMU Test Page 10 Migrating From LAN91C100FD and LAN83C183 to LAN91C111 10.1 91C111 Overview 10.2 New Features and Modification 10.2.1 Receive/PHY Control Register 10.2.2Memory Information Register 10.2.3 RX_OVRN bit 10.2.4 MDINT Interrupt bit 10.2.5Internal PHY Registers 10.2.6Media Independent Interface (MII) 10.2.7 Power Management 10.2.8Internal PHY and External PHY Selection 10.2.9 General Purpose Output 10.2.10 Reset 10.2.11 Interrupt Pin (INTR0) 10.2.12 SRAM Interface 10.2.13X25OUT Clock Output Pin 11 Design and Layout Check Guidelines