EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 265

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

Table 134. Transmit Descriptor Status
PS019209-0504
Bit
15
14
13
Name
TxOwner
TxAbort
TxBPA
Figure 49. Descriptor Table
The descriptor table contains three entries: the next pointer (NP), the packet size
(Pkt_Size) and the packet status (Stat), as illustrated in Figure 50.
Figure 50. Descriptor Table Entries
NP is a 24-bit pointer to the start of the next packet. Pkt_Size contains the number
of bytes of data in the Ethernet packet, including the four CRC bytes, but does not
contain the seven descriptor table bytes. Stat contains the status of the packet.
Stat differs for Transmit and Receive packets. See Tables 134 and 135.
TWP
TWP
Description
0 = Host (eZ80
1 = Packet aborted (not transmitted).
1 = Back pressure applied.
Descriptor
Pkt_Size
Ethernet
Packet
Table
Stat
NP
P R E L I M I N A R Y
Offset
0000h
0007h
Offset
0000h
0003h
0005h
®
) owns, 1 = EMAC owns.
Ethernet Media Access Controller
Product Specification
eZ80F91 MCU
246