RTL8139 datasheet(18/62 Pages) ETC

18 / 62 page

RTL8139C(L)

2002/01/10

Rev.1.4

memory. This field sets the threshold level according to the following

table:

000 = 16 bytes

001 = 32 bytes

010 = 64 bytes

011 = 128 bytes

100 = 256 bytes

101 = 512 bytes

110 = 1024 bytes

111 = no rx threshold. The RTL8139C(L) begins the transfer of data

after having received a whole packet in the FIFO.

12-11

R/W

RBLEN1, 0

Rx Buffer Length: This field indicates the size of the Rx ring buffer.

00 = 8k + 16 byte

01 = 16k + 16 byte

10 = 32K + 16 byte

11 = 64K + 16 byte

10-8

R/W

MXDMA2, 1, 0

Max DMA Burst Size per Rx DMA Burst: This field sets the

maximum size of the receive DMA data bursts according to the following

table:

000 = 16 bytes

001 = 32 bytes

010 = 64 bytes

011 = 128 bytes

100 = 256 bytes

101 = 512 bytes

110 = 1024 bytes

111 = unlimited

R/W

WRAP

0: The RTL8139C(L) will transfer the rest of the packet data into the

beginning of the Rx buffer if this packet has not been completely

moved into the Rx buffer and the transfer has arrived at the end of

the Rx buffer.

1: The RTL8139C(L) will keep moving the rest of the packet data into the

memory immediately after the end of the Rx buffer, if this packet has

not been completely moved into the Rx buffer and the transfer has

arrived at the end of the Rx buffer. The software driver must reserve at

least 1.5K bytes buffer to accept the remainder of the packet. We

assume that the remainder of the packet is X bytes. The next packet will

be moved into the memory from the X byte offset at the top of the Rx

buffer.

This bit is invalid when Rx buffer is selected to 64K bytes.

9356SEL

EEPROM Select: This bit reflects what type of EEPROM is used.

1: The EEPROM used is 9356.

0: The EEPROM used is 9346.

R/W

AER

Accept Error Packets: This bit determines if packets with CRC error,

alignment error and/or collided fragments will be accepted or rejected.

0: Reject error packets

1: Accept error packets

R/W

Accept Runt Packets: This bit allows the receiver to accept packets

that are smaller than 64 bytes. The packet must be at least 8 bytes long to

be accepted as a runt.

0: Reject runt packets

1: Accept runt packets

R/W

Accept Broadcast Packets: This bit allows the receiver to accept or

reject broadcast packets.

0: Reject broadcast packets

1: Accept broadcast packets

RTL8139 Datasheet(PDF) 18 Page - List of Unclassifed Manufacturers

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