LAN9312 datasheet(130/458 Pages) SMSC

Part #	LAN9312

Description	High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

PDF	458 Pages

Scroll/Zoom	100%

Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

Revision 1.2 (04-08-08)

130

SMSC LAN9312

DATASHEET

9.8.6.2

TX Example 2

In this example, a single 183-Byte Ethernet packet will be transmitted. This packet is in a single buffer

as follows:

2-Byte “Data Start Offset”

183-Bytes of payload data

4-Byte “Buffer End Alignment”

Figure 9.6 illustrates the TX command structure for this example, and also shows how data is passed

to the TX Data FIFO. Note that the packet resides in a single TX Buffer, therefore both the FS and LS

bits are set in TX command ‘A’.

Figure 9.6 TX Example 2

TX Command 'A'

TX Command 'B'

Data Written to the

Memory Mapped

TX Data FIFO Port

TX Command 'B'

183-Byte Payload Data

Data Start Offset = 6

First Segment = 1

Last Segment = 1

Buffer Size =183

Packet Length = 183

TX Command 'A'

TX Command 'B'

Data Passed to the

TX Data FIFO

Buffer End Alignment = 0

3B End Padding

TX Command 'A'

6-Byte Data Start Offset

183-Byte Payload Data

NOTE: Extra bytes between buffers

are not transmitted

LAN9312 Datasheet(PDF) 130 Page - SMSC Corporation