LAN89218 datasheet(52/148 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

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52 / 148 page

LAN89218

DS60001255B-page 52

 2008-2015 Microchip Technology Inc.

Figure 3-22 illustrates the TX command structure for this example, and also shows how data is passed to the TX

data FIFO.

FIGURE 3-22:

TX EXAMPLE 1

TXCommand'A'

TXCommand'B'

Pad DWORD 1

7-Byte Data Start Offset

10-Byte

EndPadding

79-BytePayload

Buffer End Alignment = 1

Data Start Offset = 7

First Segment = 1

Last Segment = 0

Buffer Size = 79

Packet Length = 111

TXCommand'A'

TXCommand'B'

10-Byte

EndOffsetPadding

15-BytePayload

Buffer End Alignment = 1

Data Start Offset = 0

First Segment = 0

Last Segment = 0

Buffer Size = 15

Packet Length = 111

TXCommand'A'

TXCommand'B'

Buffer End Alignment = 1

Data Start Offset = 10

First Segment = 0

Last Segment = 1

Buffer Size = 17

Packet Length = 111

10-Byte

Data Start Offset

TX Com mand 'A'

TX Com mand 'B'

TX Com mand 'A'

TX Com mand 'B'

TX Com mand 'A'

TX Com mand 'B'

NOTE: Extra bytes

betw een buffers are

not transmitted

Data Written to the

Ethernet Controller

Data Passed to the

TX Data FIFO

5-ByteEndPadding

17-BytePayloadData

TXCommand'A'

TXCommand'B'

TXCommand'A'

79-BytePayload

15-BytePayload

17-BytePayload

LAN89218 Datasheet(PDF) 52 Page - Microchip Technology

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