Intel IXF1104 manual 5.1.2.1.1Pause Frame Format, SPI3 Interface, Datasheet

Models: IXF1104

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SPI3 Interface

IXF1104 Quad-Port 10/100/1000 Mbps Ethernet Media Access Controller

Figure 7. Packet Buffering FIFO

MDI

SPI3 Interface

 

 

 

 

 

 

High Watermark

 

 

 

 

 

 

 

 

 

 

 

 

TX FIFO

 

 

 

 

TX Side

 

 

 

 

 

 

MAC Transfer Threshold

 

 

 

 

Data Flow

 

 

 

 

 

 

 

MAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low Watermark 5.1.2.1.1Pause Frame Format

High Watermark Manual background RX FIFO Data FlowRX Side

MAC

Low Watermark Manual background

 

 

 

 

 

 

 

 

 

 

 

RX FIFO High

 

 

 

 

 

 

 

TXPAUSEFR (External

802.3 Flow

 

 

 

 

Strobe)

 

 

Control

802.3x Pause Frame Generation

 

 

 

 

 

 

 

B3231-01

5.1.2.1.1Pause Frame Format

PAUSE frames are MAC control frames that are padded to the minimum size (64 bytes). Figure 8 and Figure 9 illustrate the frame format and contents.

Figure 8. Ethernet Frame Format

Number of bytes

6

1

6

6

2

46-1500

4

 

 

S

 

 

Type/

 

 

 

Preamble

F

DA

SA

Data

FCS

 

Length

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ethernet Frame

 

Note: 64 Byte Minimum / 1518 bytes Maximum

 

 

 

 

 

 

 

 

 

 

B2277-01

70

Datasheet

Document Number: 278757

Revision Number: 007

Revision Date: March 25, 2004

Page 70
Image 70
Intel IXF1104 manual 5.1.2.1.1Pause Frame Format, SPI3 Interface, Datasheet