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DM9000AEP Datasheet(PDF) 24 Page - Davicom Semiconductor, Inc.

Part # DM9000AEP
Description  Ethernet Controller with General Processor Interface
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Manufacturer  DAVICOM [Davicom Semiconductor, Inc.]
Direct Link  http://www.davicom.com.tw
Logo DAVICOM - Davicom Semiconductor, Inc.

DM9000AEP Datasheet(HTML) 24 Page - Davicom Semiconductor, Inc.

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DM9000A
Ethernet Controller with General Processor Interface
Final
24
Version: DM9000A-17-DS-F01
May 10, 2006
6.28 Early Transmit Control/Status Register ( 30H )
Bit
Name
Default
Description
7
ETE
PS0, RW
Early Transmit Enable
Enable bits[2:0]
6
ETS2
PS0,RO
Early Transmit Status II
5
ETS1
PS0,RO
Early Transmit Status I
4~2
RESERVED
000,RO
Reserved
1~0
ETT
PS0,RW
Early Transmit Threshold
Start transmit when data write to TX FIFO reach the byte-count threshold
Bit-1 bit-0
threshold
----- ----
-------------
0
0
: 12.5%
0
1
: 25%
1
0
: 50%
1
1
: 75%
6.29 Check Sum Control Register ( 31H )
Bit
Name
Default
Description
7~3
RESERVED
0,RO
Reserved
2
UDPCSE
PS0,RW
UDP CheckSum Generation Enable
1
TCPCSE
PS0,RW
TCP CheckSum Generation Enable
0
IPCSE
PS0,RW
IP CheckSum Generation Enable
6.30 Receive Check Sum Status Register ( 32H )
Bit
Name
Default
Description
7
UDPS
PS0,RO
UDP CheckSum Status
1: checksum fail, if UDP packet
6
TCPS
PS0,RO
TCP CheckSum Status
1: checksum fail, if TCP packet
5
IPS
PS0,RO
IP CheckSum Status
1: checksum fail, if IP packet
4
UDPP
PS0,RO
UDP Packet
3
TCPP
PS0,RO
TCP Packet
2
IPP
PS0,RO
IP Packet
1
RCSEN
PS0,RW
Receive CheckSum Checking Enable
When set, the checksum status (bit 7~2) will be stored in packet’s first byte(bit
7~2) of status header respectively.
0
DCSE
PS0,RW
Discard CheckSum Error Packet
When set, if IP/TCP/UDP checksum field is error, this packet will be discarded.


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