LAN89218 datasheet(57/148 Pages) MICROCHIP

Part #	LAN89218

Description	High-Performance Single-Chip 10/100 Ethernet Controller for Automotive Applications

PDF	148 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

Logo

57 / 148 page

 2008-2015 Microchip Technology Inc.

DS60001255B-page 57

LAN89218

3.13.1

RX SLAVE PIO OPERATION

Using PIO mode, the host can either implement a polling or interrupt scheme to empty the received packet out of

the RX data FIFO. The host will remain in the idle state until it receives an indication (interrupt or polling) that data

is available in the RX data FIFO. The host will then read the RX status FIFO to get the packet status, which will

contain the packet length and any other status information. The host should perform the proper number of reads, as

indicated by the packet length plus the start offset and the amount of optional padding added to the end of the frame,

from the RX data FIFO.

FIGURE 3-25:

HOST RECEIVE ROUTINE USING INTERRUPTS

FIGURE 3-26:

HOST RECEIVE ROUTINE WITH POLLING

Not Last Packet

Idle

Read RX

Status

DWORD

init

Read RX

Packet

Last Packet

RX Interrupt

Read

RX_FIFO_

INf

Read RX

Status

DWORD

init

Read RX

Packet

Last Packet

Not Last Packet

Valid Status DWORD

LAN89218 Datasheet(PDF) 57 Page - Microchip Technology