DP83815CVNG National Semiconductor, DP83815CVNG Datasheet - Page 81

• Manufacturer Part Number: DP83815CVNG
• Description: IC CONTROLLER MEDIA ACCESS
• Manufacturer: National Semiconductor

Specifications of DP83815CVNG

• Controller Type: Ethernet Controller, MAC/BIU
• Interface: PCI
• Voltage - Supply: 3.3V
• Current - Supply: 170mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DP83815CVNG

5.0 Buffer Management
5.1.2 Single Descriptor Packets
To represent a packet in a single descriptor, the MORE bit in the cmdsts field is set to 0.
24-23
Bit
26
25
22
21
20
19
18
17
16
LONG
RUNT
CRCE
DEST
RXO
RXA
COL
FAE
LBP
Tag
ISE
Receive Aborted
Receive Overrun
Destination Class
Too Long Packet
Received
Runt Packet Received The size of the receive packet was less than 64 bytes (inc. CRC).
Invalid Symbol Error
CRC Error
Frame Alignment Error The packet did not contain an integral number of octets.
Loopback Packet
Collision Activity
(Continued)
Description
Table 5-4 Receive Status Bit Definitions
Figure 5-1 Single Descriptor Packets
single descriptor / single fragment
Set to 1 by DP83815 when the receive was aborted, the value of
this bit always equals RXO. Exists for backward compatibility.
Set to 1 by DP83815 to indicate that a receive overrun condition
occurred. RXA will also be set.
When the receive filter is enabled, these bits will indicate the
destination address class as follows:
If the Receive Filter is enabled, 00 indicates that the packet was
rejected. Normally packets that are rejected do not cause any bus
activity, nor do they consume receive descriptors. However, this
condition could occur if the packet is rejected by the Receive Filter
later in the packet than the receive drain threshold
(RXCFG:DRTH).
Note: The DEST bits may not represent a correct DA class for runt
packets received with less than 6 bytes.
If RXCFG:ALP=0, this flag indicates that the size of the receive
packet exceeded 1518 bytes.
If RXCFG:ALP=1, this flag indicates that the size of the receive
packet exceeded 2046 bytes.
(100 Mb/s only) An invalid symbol was encountered during the
reception of this packet.
The CRC appended to the end of this packet was invalid.
The packet is the result of a loopback transmission.
The receive packet had a collision during reception.
netwk hdr
MAC hdr
0
data
link
ptr
81
00 - Packet was rejected
01 - Destination is a Unicast address
10 - Destination is a Multicast address
11 - Destination is a Broadcast address
64
Usage
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