STE10 View Datasheet(PDF) - STMicroelectronics
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MFG CO.
'STE10' PDF : 66 Pages View PDF
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Table 10. Receive Descriptor Descriptions
Bit#
Name
Descriptions
RDES0
31
OWN Own bit
1: indicates that newly received data can be put into this descriptor
0: Host has not yet processed the received data currently in this descriptor.
30-16
FL Frame length, including CRC. This field is valid only in a frame’s last descriptor.
15
ES Error summary. Logical OR of the following bits:
0: overflow
1: CRC error
6: late collision
7: frame too long
11: runt packet
14: descriptor error
This field is valid only in a frame’s last descriptor.
14
DE Descriptor error. This bit is valid only in a frame’s last descriptor.
1: the current valid descriptor is unable to contain the packet being currently received. The
packet is truncated.
13-12
DT Data type.
00: normal
01: MAC loop-back
10: Transceiver loop-back
11: remote loop-back
These bits are valid only in a frame’s last descriptor.
11
RF Runt frame (packet length < 64 bytes). This bit is valid only in a frame’s last descriptor.
10
MF Multicast frame. This bit is valid only in a frame’s last descriptor.
9
FS First descriptor.
8
LS Last descriptor.
7
TL Packet Too Long (packet length > 1518 bytes). This bit is valid only in a frame’s last descriptor.
6
CS Late collision. Set when collision is active after 64 bytes. This bit is valid only in a frame’s last
descriptor
5
FT Frame type. This bit is valid only in a frame’s last descriptor.
0: 802.3 type
1: Ethernet type
4
RW Receive watchdog (refer to CSR15, bit 4). This bit is valid only in a frame’s last descriptor.
3
reserved Default = 0
2
DB Dribble bit. This bit is valid only in a frame’s last descriptor
1: Packet length is not integer multiple of 8-bit.
1
CE 1: CRC error. This bit is valid only in a frame’s last descriptor
0
OF 1: Overflow. This bit is valid only in a frame’s last descriptor
RDES1
31~26
--- reserved
25
RER Receive end of ring. Indicates this descriptor is last, return to base address of descriptor
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