AX88141 datasheet(30/43 Pages) ASIX

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AX88141

PRELIMINARY

ASIX ELECTRONICS CORPORATION

CONFIDENTIAL

MF - Multicast Frame Indicates that this frame is a multicast address.

This field is valid only when last descriptor (RDES0<8>) is set.

Indicates that this descriptor contains the first buffer of a frame.

FS - First Descriptor

Indicates that this descriptor is the middle or last buffer of a frame.

Indicates that the buffers pointed to by this descriptor, are the last buffers

LS - Last Descriptor

Indicates that this descriptor is the middle or first buffer of a frame.

TL - Frame Too Long. Frame length grater then 1518 bytes. Active high.

This field is valid only when last descriptor (RDES0<8>) is set.

CS - Collision Seen. This is a late collision.

This field is valid only when last descriptor (RDES0<8>) is set.

Reserved.--Written as “0” for future compatibility concern.

RW – Received first packet flag after receiver buffer unavailable state is cleared.

RE - Report on MII Error. Active high.

DB - Dribbling Bit Active high.

If set, and CRC error (RDES0<1>) is reset, then the packet is valid.

CE - CRC Error. Active high.

This field is valid only when last descriptor (RDES0<8>) is set.

FIFO Overrun. Active high.

Tab - 38 Receive Descriptor 0

5.2.2 Receive Descriptor 1 (RDES1)

FIELD

DESCRIPTION

31:11

Reserved.--Written as “0” for future compatibility concern.

10:0

RBS - Receive Data Buffer Size

Indicates the size in bytes of the data buffer. If this field is 0, the AX88141 ignores this buffer.

The buffer size must be a multiple of 4.

Tab - 39 Receive Descriptor 1

5.2.3 Receive Descriptor 2 (RDES2)

FIELD

DESCRIPTION

31:0

Data Buffer Pointer

Indicates the physical address of data buffer. The buffer must be long-word-aligned (RDES2<1:0>=00).

Tab - 40 Receive Descriptor 2

5.2.4 Receive Descriptor 3 (RDES3)

FIELD

DESCRIPTION

31:0

Address Pointer

Indicates the physical address of next descriptor. The address must be long-word aligned (RDES3<1:0>=00).

Tab - 41 Receive Descriptor 3

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