ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 307

• Manufacturer Part Number: ez80f91
• Description: Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
• Manufacturer: ZiLOG Semiconductor

Table 178. Transmit Descriptor Status
Table 179. Receive Descriptor Status
PS027001-0707
Bit
15
14
13
12
11
10
9
8
7
6
5
4
[3:0]
Bit
15
14
13
Name
TxOwner
TxAbort
TxBPA
TxHuge
TxLOOR
TxLCError
TxCrcError
TxPktDeferred
TxXsDfr
TxFifoUnderRun
TxLateCol
TxMaxCol
TxNumberOfCollisions
Name
RxOK
RxAlignError
RxCrcError
Description
0 = Host (eZ80) owns, 1 = EMAC owns.
1 = Packet aborted (not transmitted).
1 = Back pressure applied.
1 = Packet size is very large (Pkt_Size > EmacMaxf).
1 = Type/Length field is out of range (larger than 1518 bytes).
1 = Type/Length field is not a Type field and it does not match the
actual data byte length of the Ethernet packet. The data byte length is
the number of bytes of data in the Ethernet packet between the Type/
Length field and the FCS.
1 = The packet contains an invalid FCS (CRC). This flag is set when
CRCEN = 0 and the last 4 bytes of the packet are not the valid FCS.
1 = Packet is deferred.
1 = Packet is excessively deferred. (> 6071 nibble times in 100 BaseT
or 24,287 bit times in 10 BaseT).
1 = TxFIFO experiences underrun. Check the TxAbort bit to see if the
packet is aborted or retried.
1 = A late collision occurs. Collision is detected at a byte count >
EmacCfg2[5:0]. Collisions detected before the byte count reaches
EmacCfg2[5:0] are early collisions and retried.
1 = The maximum number of collisions occurs. # Collisions >
EmacCfg3[3:0]. These packets are aborted.
This field contains the number of collisions that occur while transmitting
the packet.
Description
1 = Packet received intact.
1 = An odd number of nibbles is received.
1 = The CRC (FCS) is in error.
Ethernet Media Access Controller
Product Specification
eZ80F91 ASSP
299