DP83907VF National Semiconductor, DP83907VF Datasheet - Page 34

• 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

D1 and
5 0 Register Descriptions
TRANSMIT CONFIGURATION REGISTER (TCR)
The transmit configuration establishes the actions of the transmitter section of the DP83907 during transmission of a packet on
the network LB1 and LB0 which select loopback mode power up as 0
Bit
D0
D2
D3
D4
D5
D6
D7
CRC
LB0 and
LB1
ATD
OFST
Reserved
Reserved
Reserved
Symbol
INHIBIT CRC
In loopback mode CRC can be enabled or disabled to test the CRC logic
ENCODED LOOPBACK CONTROL These encoded configuration bits set the type of loopback that is to be
performed Note that loopback in mode 2 places the ENDEC Module in loopback mode and that D3 of the
DCR must be set to zero for loopback operation
AUTO TRANSMIT DISABLE This bit allows another station to disable the DP83907’S transmitter by
transmission of a particular multicast packet The transmitter can be re-enabled by resetting this bit or by
reception of a second particular multicast packet
COLLISION OFFSET ENABLE This bit modifies the backoff algorithm to allow prioritization of nodes
Reserved
Reserved
Reserved
0 CRC appended by transmitter
1 CRC inhibited by transmitter
0 Normal Operation
1 Reception of multicast address hashing to bit 62 disables transmitter reception of multicast address
0 Backoff Logic implements normal algorithm
1 Forces Backoff algorithm modification to 0 to 2
Mode 0
Mode 1
Mode 2
Mode 3
hashing to bit 63 enables transmitter
follows standard backoff (For the first three collisions the station has higher average backoff delay
making a low priority mode )
7
LB1
6
0
0
1
1
(Continued)
5
LB0
0
1
0
1
OFST
ODH (WRITE)
4
Normal Operation (LPBK
Internal NIC Module Loopback (LPBK
Internal ENDEC Module Loopback (LPBK
External Loopback (LPBK
34
ATD
3
Description
min(3
LB1
2
a
n 10)
e
e
LB0
slot times for first three collisions then
0)
1
0)
CRC
e
0
0)
e
1)