LAN9730 datasheet(60/222 Pages) MICROCHIP

60 / 222 page

LAN9730/LAN9730i

DS00001946A-page 60

 2012-2015 Microchip Technology Inc.

4.4.2.10

Flushing the TX FIFO

The device allows for the host to flush the entire contents of the FCT TX FIFO. When a flush is activated, the read and

write pointers for the TX FIFO are returned to their reset state.

Before flushing the TX FIFO, the device’s transmitter must be stopped, as specified in Section 4.4.2.11. Once the trans-

mitter stop completion is confirmed, the Transmit FIFO Flush bit can be set in the Transmit Configuration Register

(TX_CFG) on page 124. This bit is cleared after the flush is complete.

FIGURE 4-8:

TX EXAMPLE 3

TX Command A

TX Command B

TX Command A

TX Command B

115 Byte

Ethernet

Frame

15 Byte Payload

79 Byte Payload

USB Packet 0

TX Command A

TX Command B

TX Command A

Data Start Offset = 0

First Segment = 1

Last Segment = 0

Buffer Size = 4

TX Command B

Frame Length = 111

TX Checksum Enable = 1

Checksum Preamble

TX Checksum Location = 50

TX Checksum Start Pointer = 14

Checksum Preamble

TX Command A

Data Start Offset = 3

First Segment = 0

Last Segment = 0

Buffer Size = 79

TX Command B

Frame Length = 111

TX Checksum Enable = 1

TX Command A

TX Command B

TX Command A

TX Command B

TX Command A

Data Start Offset = 0

First Segment = 0

Last Segment = 0

Buffer Size = 15

TX Command B

Frame Length = 111

TX Checksum Enable = 1

TX Command A

Data Start Offset = 2

First Segment = 0

Last Segment = 1

Buffer Size = 17

TX Command B

Frame Length = 111

TX Checksum Enable = 1

17 Byte Payload

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