LAN9500AI datasheet(149/213 Pages) MICROCHIP

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DS00001875A-page 149

LAN950x

7.3.23

RECEIVE FIFO LEVEL DEBUG REGISTER (DBG_RX_FIFO_LVL)

Address:

070h

Size:

32 bits

Bits

Description

Type

Default

31:30

RESERVED

29:16

RX FIFO Read Level (RXRDLVL)

This is a DWORD count defined as follows:

The count is increased by the number of DWORDs contained in the packet

after the ENTIRE packet has been written into the FIFO.

As a packet is read from the FIFO, it is decremented each time a DWORD

is read.

On rewind, it will increase by the number of DWORDS read out of the FIFO.

Note:

Rewind case example: on a USB error, whatever was read will be

rewound and the packet will be retransmitted to the host.

0000h

15:14

RESERVED

13:0

RX FIFO Write Level (RXWRLVL)

This is a DWORD count defined as follows:

As a packet is written into the FIFO, it is incremented each time a DWORD

is written.

Whenever a COMPLETE packet has been read from the FIFO, it is

decreased by the number of DWORDs contained in the packet.

On rewind, it is decreased by the number of DWORDs of the packet that has

currently been transferred into the FIFO.

Note:

Rewind case example: on an FCS error, whatever was written in the

FIFO will be rewound out.

0000h

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