LAN9220 datasheet(55/142 Pages) MICROCHIP

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DS00002417A-page 55

LAN9220

3.13.3

RX STATUS FORMAT

FIGURE 3-27:

RX PACKET FORMAT WITH RX CHECKSUM

Bits

Description

Reserved. This bit is reserved. Reads 0.

Filtering Fail. When set, this bit indicates that the associated frame failed the address recognizing

filtering.

29:16

Packet Length. The size, in bytes, of the corresponding received frame.

Error Status (ES). When set this bit indicates that the MIL has reported an error. This bit is the

Internal logical “or” of bits 11,7,6 and 1.

Reserved. These bits are reserved. Reads 0.

Broadcast Frame. When set, this bit indicates that the received frame has a Broadcast address.

Length Error (LE). When set, this bit indicates that the actual length does not match with the

length/type field of the received frame.

Runt Frame. When set, this bit indicates that frame was prematurely terminated before the collision

window (64 bytes). Runt frames are passed on to the host only if the Pass Bad Frames bit MAC_CR

Bit [16] is set.

Multicast Frame. When set, this bit indicates that the received frame has a Multicast address.

9:8

Reserved. These bits are reserved. Reads 0.

ofs + First Data DWORD

Last Data DWORD

Host Read

Order

1st

2nd

Last

Optional Pad DWORD0

Optional Pad DWORDn

Optional offset DWORD0

Optional offset DWORDn

Checksum

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