DM9000A
Ethernet Controller with General Processor Interface
6.2 Network Status Register (01H)
Bit
7
Name
SPEED
Default
Description
Media Speed 0:100Mbps 1:10Mbps, when Internal PHY is used. This bit has no
meaning when LINKST=0
X,RO
6
LINKST
X,RO
P0,
RW/C1
0,RO
PS0,
Link Status 0:link failed 1:link OK,
Wakeup Event Status. Clears by read or write 1 (work in 8-bit mode)
This bit will not be affected after software reset
Reserved
TX Packet 2 Complete Status. Clears by read or write 1
Transmit completion of packet index 2
5
WAKEST
RESERVED
TX2END
4
3
RW/C1
PS0,
RW/C1
TX Packet 1 Complete status. Clears by read or write 1
Transmit completion of packet index 1
2
TX1END
1
0
RXOV
RESERVED
PS0,RO RX FIFO Overflow
0,RO
Reserved
6.3 TX Control Register (02H)
Bit
Name
Default
Description
7
RESERVED
0,RO
Reserved
Transmit Jabber Disable
6
TJDIS
PS0,RW
When set, the transmit Jabber Timer (2048 bytes) is disabled. Otherwise it is
Enable
Excessive Collision Mode Control : 0:aborts this packet when excessive collision
counts more than 15, 1: still tries to transmit this packet
PAD Appends Disable for Packet Index 2
CRC Appends Disable for Packet Index 2
PAD Appends Disable for Packet Index 1
5
EXCECM
PS0,RW
4
3
2
1
0
PAD_DIS2
CRC_DIS2
PAD_DIS1
CRC_DIS1
TXREQ
PS0,RW
PS0,RW
PS0,RW
PS0,RW
PS0,RW
CRC Appends Disable for Packet Index 1
TX Request. Auto clears after sending completely
6.4 TX Status Register I ( 03H ) for packet index I
Bit
Name
Default
Description
Transmit Jabber Time Out
7
TJTO
PS0,RO
It is set to indicate that the transmitted frame is truncated due to more than 2048
bytes are transmitted
Loss of Carrier
6
5
LC
PS0,RO
PS0,RO
It is set to indicate the loss of carrier during the frame transmission. It is not valid in
internal loopback mode
No Carrier
It is set to indicate that there is no carrier signal during the frame transmission. It is
not valid in internal loopback mode
NC
Late Collision
4
3
2
LC
COL
EC
PS0,RO
PS0,RO
PS0,RO
It is set when a collision occurs after the collision window of 64 bytes
Collision Packet
It is set to indicate that the collision occurs during transmission
Excessive Collision
It is set to indicate that the transmission is aborted due to 16 excessive collisions
Final
15
Version: DM9000A-17-DS-F01
May 10, 2006
DAVICOM [ DAVICOM SEMICONDUCTOR, INC. ]
