DP83936AVF NSC [National Semiconductor], DP83936AVF Datasheet - Page 35

• Manufacturer Part Number: DP83936AVF
• Description: Full Duplex SONICTM-T Systems-Oriented Network Interface Controller with Twisted Pair Interface
• Manufacturer: NSC [National Semiconductor]

6 0 SONIC-T Registers
6 2 FULL DUPLEX OPERATION
The SONIC-T can be configured to allow Full Duplex opera-
tion All other operation of the SONIC-T is the same except
that collisions are ignored
6 2 1 Configuring the SONIC-T DCR2
In order to use the SONIC-T in full duplex mode the HD and
FD bits must be set in DCR2
1 Put the SONIC-T in software reset by setting RST bit (bit
2 Enable Full Duplex operation by setting the FD bit (bit 5)
7) in the CR
in the DCR2
(Continued)
35
3 Disable Heartbeat detection by setting the HD bit (bit 11)
4 Take the SONIC-T out of software reset by clearing the
6 2 2 Increased Buffering
In order to avoid Receive Buffer Exhaustions (RBE’s) due to
increased traffic in Full Duplex mode it is recommended
that the number if entries in the RRA be increased to be
greater than what typically is used for Half Duplex (see Sec-
tion 5 4 4 2 Initializing the RRA)
in the DCR2
RST bit (bit 7) in the CR
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