DM9102DEP datasheet(42/70 Pages) DAVICOM

42 / 70 page

Final

Version: DM9102D-DS-F01

May 10, 2006

OWN

Status

Control bits

Buffer Address

Next Descriptor Address

RDES

Buffer Length

OWN

Receive Descriptor Format

RDES0:

OWN

Frame Length ( FL )

AUN

Bit 31: OWN, Owner bit of received status

1=owned by DM9102, 0=owned by host

This bit will be reset after packet reception is completed. The

host will set this bit after received data is removed.

Bit 30: AUN, Received address unmatched.

Bit 29-16: FL, Frame Length

Frame length indicates total byte count of received packet.

DUE

LBOM

TLF

LCS

RWT PLE

FOE

EFL

This word-wide content includes status of received frame.

They are loaded after the received buffer that belongs to the

corresponding descriptor is full. All status bits are valid only

when the last descriptor (End Descriptor) bit is set.

Bit 15: ES, Error Summary

It is set for the following error conditions:

Descriptor Unavailable Error (DUE =1), Runt Frame

(RF=1), Excessive Frame Length (EFL=1), Late Collision

Seen (LCS=1), CRC error (CE=1), FIFO Overflow error

(FOE=1). Valid only when ED is set.

Bit 14: DUE, Descriptor Unavailable Error

It is set when the frame is truncated due to the buffer

unavailable. It is valid only when ED is set.

Bit 13,12: LBOM, Loopback Operation Mode or

IP/TCP/UDP checksum status

If CR15 bit 27 is set, these two bits present the IP/TCP/UDP

status:

0X -- IP checksum OK

1X --IP checksum FAIL

X0 – TCP or UDP checksum OK

X1 – TCP or UDP checksum FAIL

; otherwise

these two bits show the received frame is derived from:

00 --- Normal

01 --- Internal loopback

10 --- Internal PHY digital loopback

11 --- Internal PHY analog loopback

Bit 11: RF, Runt Frame

It is set to indicate the received frame has the size smaller

than 64 bytes. It is valid only when ED is set and FOE is

reset.

Bit 10: MF, Multicast Frame

It is set to indicate the received frame has a multicast

address. It is valid only when ED is set.

Bit 9: BD, Begin Descriptor

This bit is set for the descriptor indicating the start of a

received frame.

Bit 8: ED, End Descriptor

This bit is set for descriptor to indicate the end of a received

frame.

Bit 7: EFL, Excessive Frame Length

It is set to indicate the received frame length exceeds 1518

bytes. Valid only when ED is set.

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