DP83932C NSC [National Semiconductor], DP83932C Datasheet - Page 10

• Manufacturer Part Number: DP83932C
• Description: MHz SONICTM Systems-Oriented Network Interface Controller
• Manufacturer: NSC [National Semiconductor]

1 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 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 in normal op-
eration 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 for proper oper-
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)
er (RXEN) in the Command register
ation This restriction occurs because the transmit MAC section
which does not generate an Interframe Gap time (IFG) 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 buses
FIGURE 1-7 SONIC Bus Interface Signals
(Continued)
10
1 8 NETWORK MANAGEMENT FUNCTIONS
The SONIC 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 provides three tally counters to tabulate
CRC errors Frame Alignment errors and missed packets
Table 1-1 shows the statistics indicated by the SONIC
TL F 10492 – 8