DP83934CVUL20 National Semiconductor, DP83934CVUL20 Datasheet - Page 21

• Manufacturer Part Number: DP83934CVUL20
• Manufacturer: National Semiconductor

Specifications of DP83934CVUL20

• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (max): 5.25V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 160
• Lead Free Status / RoHS Status: Not Compliant

3 0 Functional Description
4 Program the Receive Control register with the desired re-
5 Issue the transmit command (TXP) and enable the receiv-
The SONIC-T completes the loopback operation after the
packet has been completely received (or rejected if there is
an address mismatch) The Transmit Control and Receive
Control registers treat the loopback packet as it would in
normal operation and indicate status accordingly Interrupts
are also generated if enabled in the Interrupt Mask register
Note For MAC Loopback only one packet may be queued up for proper
Note DSACK0 1 are used for both Bus and Slave Access Control and are bidirectional SMACK is used for both Slave access and shared memory access The
ceive filter and the loopback mode (LB1 LB0) In case of
transceiver loopback besides setting LB1 and LB0 to 1
the XWRAP bit in the DCR2 must also set to 1
er (RXEN) in the Command register
operation This restriction occurs because the transmit MAC section
which does not generate an Interframe Gap (IFG) time between
transmitted packets does not allow the receive MAC section to up-
date receive status There are no restrictions for the other loopback
modes
BMODE pin selects between National Intel or Motorola type busses
FIGURE 3-10 SONIC-T Bus Interface Signals
(Continued)
21
3 9 NETWORK MANAGEMENT FUNCTIONS
The SONIC-T fully supports the Layer Management IEEE
802 3 standard to allow a node to monitor the overall per-
formance of the network These statistics are available on a
per packet basis at the end of reception or transmission
In addition the SONIC-T provides three tally counters to
tabulate CRC errors Frame Alignment errors and missed
packets Table 3-1 shows the statistics indicated by the
SONIC-T
TL F 11719 – 13