AN983 ETC [List of Unclassifed Manufacturers], AN983 Datasheet - Page 52

• Manufacturer Part Number: AN983
• Description: PCI/miniPCI-to-Ethernet LAN Controller
• Manufacturer: ETC [List of Unclassifed Manufacturers]

7.4.1 RECEIVE DESCRIPTOR
7 . 4 . 1 . 1 R e c e i v e D e s c r i p t o r T a b l e
RDES0
RDES1
RDES2
RDES3
Descriptors and receive buffers addresses must be longword alignment
7 . 4 . 1 . 2 R e c e i v e D e s c r i p t o r D e s c r i p t i o n s
RDES0
Bit #
31
30-16
15
14
13-12
11
10
Rev. 1.8
The AN983B provides receive and transmit descriptors for packet buffering and management.
31
Own
Name
OWN
FL
ES
DE
DT
RF
MF
---
Descriptions
Own bit
1: indicate the new receiving data can be put into this descriptor
0: Host does not move the receiving data out yet.
Frame length, including CRC. This field is valid only in last descriptor
Error summary, OR of the following bit
This field is valid only in last descriptor.
Descriptor error. This bit is valid only in last descriptor
1: the current receiving packet is not able to put into the current valid descriptor.
This packet is truncated.
Data type.
00: normal
01: MAC loop-back
10: Transceiver loop-back
11: remote loop-back
These bits are valid only in last descriptor
Runt frame (packet length < 64 bytes). This bit is valid only in last descriptor
Multicast frame. This bit is valid only in last descriptor
0: overflow
1: CRC error
6: late collision
7: frame too long
11: runt packet
14: descriptor error
Control
AN983B
Buffer1 address (DW boundary)
Buffer2 address (DW boundary)
www.admtek.com.tw
ADMtek Inc.
Buffer2 byte-count
PCI/miPCI Fast Ethernet Controller with integrated PHY
Status
Buffer1 byte-count
52
0