ARM ARM DUI 0224I manual About the Smsc LAN91C111

Models: ARM DUI 0224I

1 402
Download 402 pages 14.06 Kb
Page 131
Image 131

 

Hardware Description

 

Table 3-16 Ethernet signals (continued)

 

 

Signal

Description

 

 

TPI+, TPI-

Signal from interface to controller.

 

 

LEDA, LEDB

Activity indicator LEDs. The function of the LEDs can be configured by writing

 

to a LAN91C111 register.

 

 

ETHRESET

Reset signal to LAN91C111.

 

 

ETHARDY

Asynchronous ready signal.

 

 

ETHSRDY

Synchronous ready signal.

 

 

ETHnRDYRTN

Signals to the controller to complete synchronous read cycles.

 

 

ETHnADS

Latches address to controller.

 

 

ETHLCLK

Clock to controller interface.

 

 

ETHnRD

Read signal for asynchronous interface.

 

 

ETHnWR

Write signal for asynchronous interface.

 

 

ETHnDATACS

Enables accesses to the controller data path.

 

 

ETHnCYCLE

Used to control EISA burst mode synchronous cycles if LOW.

 

 

ETHAEN

Address valid signal to controller.

 

 

ETHnLDEV

Asserted LOW if the address enable signal, ETHAEN, is low and the address lines

 

decode to the controller address programmed into the base address register.

 

 

ETHWnR

Defines bus direction for synchronous accesses.

 

 

ETHnVLBUS

This signal is connected to ground by a pull-down resistor. If LOW, the controller

 

uses VL bus accesses. If HIGH, the controller uses EISA DMA accesses.

 

 

3.10.1About the SMSC LAN91C111

The SMCS LAN91C11 is a fast Ethernet controller that incorporates a Media ACcess (MAC) Layer, a PHYsical (PHY) layer, and an 8KB dynamically configurable transmit and receive FIFO.

The controller supports dual-speed 100Mbps or 10Mbps and auto configuration. When auto configuration is enabled, the chip is automatically configured for network speed and for full or half-duplex operation.

ARM DUI 0224I

Copyright © 2003-2010 ARM Limited. All rights reserved.

3-69

Page 131
Image 131
ARM ARM DUI 0224I manual About the Smsc LAN91C111