DM9102AT datasheet(50/77 Pages) ETC

50 / 77 page

DM9102A

Single Chip Fast Ethernet NIC controller

Final

Version: DM9102A-DS-F03

August 28, 2000

OWN

Status

Control bits

Buffer Address

Next Descriptor Address

RDES0

RDES1

RDES2

RDES3

Buffer Length

OWN

Receive Descriptor Format

RDES0:

OWN

Frame Length ( FL )

AUN

OWN: Owner bit of received status

1=owned by DM9102, 0=owned by host

This bit should be reset after packet reception is completed.

The host will set this bit after received data is removed.

AUN: Received address unmatched.

FL: Frame Length

Frame length indicating total byte count of received packet.

1 5

1 4

1 3

1 2

1 1

1 0

R F

D U E

LBOM

B D

E D

TLF

LCS

F T

R W T P L E

A E

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

These two bits show the received frame is derived from:

00 --- normal operation

01 --- internal loopback

10 --- PHY loopback

11 --- external loopback

Bit 11: RF, Runt Frame

It is set to indicate the received frame has the sizesmaller

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 start of a received

frame.

Bit 8: ED, Ending Descriptor

This bit is set for descriptor to indicate 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.

Bit 6: LCS: Late Collision Seen

It is set to indicate a late collision found during the frame

reception. Valid only when ED is set.

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