DP83907VF National Semiconductor, DP83907VF Datasheet - Page 35

• Manufacturer Part Number: DP83907VF
• Description: IC CONTROLLR AT/LANII TP 160PQFP
• Manufacturer: National Semiconductor

Specifications of DP83907VF

• Controller Type: Network Interface Controller (NIC)
• Interface: Twisted Pair
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 150mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-MQFP, 160-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DP83907VF

Bit
D0
D1
D2
D3
D4
D5
D6
D7
5 0 Register Descriptions
TRANSMIT STATUS REGISTER (TSR)
This register records events that occur on the media during transmission of a packet It is cleared when the next transmission is
initiated by the host All bits remain low unless the event that corresponds to a particular bit occurs during transmission Each
transmission should be followed by a read of this register The contents of this register are not specified until after the first
transmission
PTX
Reserved
COL
ABT
CRS
FU
CDH
OWC
Symbol
PACKET TRANSMITTED Indicates transmission without error (No excessive collisions or FIFO underrun)
(ABT
Reserved
TRANSMIT COLLIDED Indicates that the transmission collided at least once with another station on the
network The number of collisions is recorded in the Number of Collisions Registers (NCR)
TRANSMIT ABORTED Indicates the DP83907 aborted transmission because of excessive collisions (Total
number of transmissions including original transmission attempt equals 16 )
CARRIER SENSE LOST This bit is set when carrier is lost during transmission of the packet Transmission is not
aborted on loss of carrier
FIFO UNDERRUN If the DP83907 cannot gain access of the bus before the FIFO empties this bit is set
Transmission of the packet will be aborted
CD HEARTBEAT Failure of the transceiver to transmit a collision signal after transmission of a packet will set
this bit The Collision Detect (CD) heartbeat signal must commence during the first 6 4 s of the Interframe Gap
following a transmission In certain collisions the CD Heartbeat bit will be set even though the transceiver is not
performing the CD heartbeat test
OUT OF WINDOW COLLISION Indicates that a collision occurred after a slot time (51 2 s) Transmissions
rescheduled as in normal collisions
e
‘‘0’’ FU
OWC
7
e
‘‘0’’)
CDH
6
(Continued)
04H (READ)
FU
5
CRS
4
35
Description
ABT
3
COL
2
1
PTX
0