DS80C400 Maxim, DS80C400 Datasheet - Page 66

• Manufacturer Part Number: DS80C400
• Description: The DS80C400 network microcontroller offers the highest integration available in an 8051 device
• Manufacturer: Maxim

NOCRS, No Carrier. This bit is only valid in half-duplex mode.
0 = transmit frame was not aborted due to lack of carrier
1 = transmit frame aborted due to lack of carrier (CRS = 0 when transmit frame initiated)
JABTO, Jabber Timeout
0 = transmit frame was not aborted due to jabber timeout
1 = transmit frame aborted due to jabber timeout (MAC transmitter has been active for twice the Ethernet max
frame length)
ABORT, Frame Aborted
0 = transmit frame was not aborted
1 = transmit frame was aborted by the MAC due to one of the following conditions: jabber timeout, no carrier, loss
of carrier, excessive deferral, late collision, retry count exceeds the attempt limit, and data underrun
Receive Status Word
Bit Names:
MF, Missed Frame
0 = receive frame was not missed
1 = receive frame missed
PF, Packet Filter
0 = current frame failed the packet filter
1 = current frame passed the packet filter
FF, Filter Fail
0 = destination address of the current receive frame passed the applied address filter
1 = destination address of the current receive frame failed the applied address filter
BCF, Broadcast Frame
0 = receive frame is not a broadcast frame
1 = receive frame is a broadcast frame (i.e., destination address is all ones)
MCF, Multicast Frame
0 = receive frame is not a multicast frame
1 = receive frame is a multicast frame (i.e., first bit of the destination address is a 1)
UCTRL, Unsupported Control Frame. This bit is only valid in full-duplex mode.
0 = receive frame is not an unsupported control frame
1 = receive frame is a control frame that is not supported (i.e., one that contains an op code field that is not
supported or one that is not equal to the 64-Byte minimum frame size)
CTRL, Control Frame. This bit is only valid in full-duplex mode.
0 = receive frame is not a control frame
1 = receive frame is a control frame
LEN, Length Error. The frame length check is performed only when type/length field contains frame length (TYPE
= 0). When the data field contains more bytes than specified in the length field, these bytes are assumed to be pad
bytes.
0 = receive frame passed the frame length check
1 = receive frame contained fewer bytes than specified in the length field
31
23
15
7
VLAN2
RUNT
MF
VLAN1
WDOG
PF
CRC
FF
DRIB
BCF
FLEN [7:0]
66 of 97
MII_ER
MCF
FLEN [13:8]
UCTRL
TYPE
CTRL
COL
LONG
LEN
24
16
8
0